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DEI - shares	6 Months Ended
DEI - shares	Jun. 30, 2014	Jul. 28, 2014
DEI [Abstract]
Entity Registrant Name	Five9, Inc.
Trading Symbol	FIVN
Entity Central Index Key	0001288847
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		48,414,536

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 61,577	$ 17,748
Short-term investments	29,995
Accounts receivable, net	7,098	6,970
Prepaid expenses and other current assets	2,779	1,651
Total current assets	101,449	26,369
Property and equipment, net	11,521	11,607
Intangible assets, net	2,809	3,065
Goodwill	11,798	11,798
Other assets	1,350	3,439
Total assets	128,927	56,278
Current liabilities:
Accounts payable	3,373	4,306
Accrued and other current liabilities	8,152	5,929
Accrued federal fees	4,361	4,206
Sales tax liability	127	98
Revolving line of credit	12,500
Notes payable	2,573	1,522
Capital leases	4,742	4,857
Deferred revenue	5,009	4,375
Total current liabilities	40,837	25,293
Revolving line of credit — less current portion	0	12,500
Sales tax liability — less current portion	2,358	5,350
Notes payable — less current portion	24,247	7,095
Capital leases — less current portion	3,355	4,358
Convertible preferred and common stock warrant liabilities	0	3,935
Other long-term liabilities	613	715
Total liabilities	71,410	59,246
Commitments and contingencies (Note 10)
Stockholders’ equity (deficit):
Convertible preferred stock, $0.001 par value; no shares authorized, issued and outstanding as of June 30, 2014; 125,115 shares authorized, 122,216 shares issued and outstanding as of December 31, 2013		53,734
Preferred stock, $0.001 par value; 5,000 shares authorized, no shares issued and outstanding as of June 30, 2014; no shares authorized, issued and outstanding as of December 31, 2013	0	0
Common stock, $0.001 par value; 450,000 shares authorized, 48,406 shares issued and outstanding as of June 30, 2014; 200,000 shares authorized, 5,494 shares issued and outstanding as of December 31, 2013	48	5
Additional paid-in capital	165,244	34,089
Accumulated deficit	(107,775)	(90,796)
Total stockholders’ equity (deficit)	57,517	(2,968)
Total liabilities and stockholders’ equity (deficit)	$ 128,927	$ 56,278

Condensed Consolidated Balance Sheets - Parenthetical - $ / shares	Jun. 30, 2014	Dec. 31, 2013
Class of Stock
Preferred Stock, par value	$ 0.001
Preferred Stock, shares authorized	5,000,000
Common Stock, par value	$ 0.001	$ 0.001
Common Stock, shares authorized	450,000,000	200,000,000
Common Stock, shares issued	48,405,953	5,494,000
Common Stock, shares outstanding	48,405,953	5,494,000
Convertible Preferred Stock
Class of Stock
Preferred Stock, par value		$ 0.001
Preferred Stock, shares authorized		125,115,000
Preferred Stock, shares issued		122,216,000
Preferred Stock, shares outstanding		122,216,000

Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Revenue	$ 24,685	$ 20,283	$ 48,959	$ 39,398
Cost of revenue	13,469	12,215	26,617	23,896
Gross profit	11,216	8,068	22,342	15,502
Operating expenses:
Research and development	5,554	4,106	10,779	8,260
Sales and marketing	9,674	7,227	18,696	13,374
General and administrative	3,515	4,052	9,686	7,877
Total operating expenses	18,743	15,385	39,161	29,511
Loss from operations	(7,527)	(7,317)	(16,819)	(14,009)
Other income (expense), net:
Change in fair value of convertible preferred and common stock warrant liabilities		(785)	1,745	(555)
Interest expense	(1,092)	(215)	(1,870)	(393)
Interest income and other	(28)	32	4	34
Total other income (expense), net	(1,120)	(968)	(121)	(914)
Loss before provision for income taxes	(8,647)	(8,285)	(16,940)	(14,923)
Provision for income taxes	12	5	39	24
Net loss	$ (8,659)	$ (8,290)	$ (16,979)	$ (14,947)
Net loss per share:
Basic and diluted (in usd per share)	$ (0.18)	$ (2.25)	$ (0.64)	$ (4.14)
Shares used in computing net loss per share:
Weighted-average shares used in computing basic and diluted net loss per share (in shares)	46,898	3,684	26,367	3,610
Comprehensive Loss:
Other comprehensive income (loss)	$ 0	$ 0	$ 0	$ 0
Comprehensive loss	$ (8,659)	$ (8,290)	$ (16,979)	$ (14,947)

Condensed Consolidated Statements of Cash Flows $ in Thousands	6 Months Ended
	Jun. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)
Cash flows from operating activities:
Net loss	$ (16,979)	$ (14,947)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	3,291	1,839
Provision for doubtful accounts	39	19
Stock-based compensation	2,919	568
Loss on the disposal of property and equipment		4
Non-cash interest expense	129
Changes in fair value of convertible preferred and common stock warrant liabilities	(1,745)	555
Accretion of discounts on short-term investments	(2)
Changes in operating assets and liabilities:
Accounts receivable	(126)	(206)
Prepaid expenses and other current assets	(1,070)	(478)
Other assets	(55)	(192)
Accounts payable	(508)	577
Accrued and other current liabilities	1,985	841
Accrued federal fees and sales tax liability	(2,808)	1,210
Deferred revenue	634	213
Other liabilities	(102)	173
Net cash used in operating activities	(14,398)	(9,824)
Cash flows from investing activities:
Purchases of property and equipment	(336)	(125)
Restricted cash	(25)
Purchase of short-term investments	(29,993)
Proceeds from sale of short-term investments		2,490
Net cash provided by (used in) investing activities	(30,354)	2,365
Cash flows from financing activities:
Net proceeds from initial public offering, net of payments for offering costs	71,459
Payments for deferred offering costs		(306)
Net proceeds from issuance of convertible preferred stock		21,794
Proceeds from exercise of common stock options and warrants	705	159
Proceeds from notes payable	19,561
Repayments of notes payable	(519)	(322)
Payments of capital leases	(2,625)	(2,085)
Proceeds from revolving line of credit		6,000
Repayments on revolving line of credit		(6,000)
Net cash provided by financing activities	88,581	19,240
Net increase in cash and cash equivalents	43,829	11,781
Cash and cash equivalents:
Beginning of period	17,748	5,961
End of period	61,577	17,742
Non-cash investing and financing activities:
Equipment obtained under capital lease	2,598	2,564
Equipment purchased and unpaid at period-end	23	64
Deferred initial public offering costs incurred but unpaid at period-end		$ 216
Reclass of deferred initial public offering costs to additional paid-in capital	2,179
Net cashless exercise of preferred stock warrants to Series A-2 convertible preferred stock	509
Vesting of early exercised stock options	57
Reclass of warrants liabilities to additional paid-in capital upon initial public offering	2,647
Conversion of convertible preferred stock to common stock upon initial public offering	$ 54,244

Description of Business and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block]	1. Description of Business and Summary of Significant Accounting Policies Five9, Inc. and its wholly-owned subsidiaries (the “Company”) is a provider of cloud contact center software. The Company was incorporated in Delaware in 2001 and is headquartered in San Ramon, California. The Company has offices in Europe and Asia which primarily provide research, development and client support services. Basis of Presentation The accompanying condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company’s prospectus (dated April 3, 2014) filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933 on April 4, 2014. All intercompany transactions and balances have been eliminated in consolidation. Initial Public Offering On April 9, 2014, the Company consummated its initial public offering ("IPO") and issued and sold 10,000,000 shares of common stock at a public offering price of $7.00 per share, less the underwriters’ discount. In addition, on April 22, 2014, the Company consummated the sale of an additional 1,500,000 shares of common stock to the underwriters of the Company's IPO pursuant to the underwriters’ exercise in full of their option to purchase 1,500,000 shares of common stock from the Company at the IPO price of $7.00 per share, less the underwriters' discount. The Company received aggregate proceeds of $74.9 million from the IPO after deducting underwriters’ discounts and commissions of $5.6 million, but before deduction of offering expenses of approximately $4.2 million, of which $1.6 million had been paid by us prior to the IPO including $0.8 million paid during the three months ended March 31, 2014. The remaining $2.6 million of the offering expenses was paid in the three months ended June 30, 2014. On April 3, 2014, a reverse stock split of the Company's then-outstanding common stock at a ratio of 4:1 was effected in connection with the IPO. Prior to such reverse stock split being effected, all outstanding convertible preferred stock elected to convert to common stock on a 1:1 basis. In addition, upon the IPO, the Company’s outstanding convertible preferred stock warrants became warrants to purchase common stock and the Company’s outstanding common stock warrant liabilities became indexed to the Company's common stock and accordingly been reclassified to additional paid-in capital. In this quarterly report on Form 10-Q, all information related to common stock, warrants to purchase common stock, stock awards and earnings per share has been retroactively adjusted to give effect to the 4:1 reverse stock split, without any change in the par value per share. Fractional shares resulting from the reverse stock split have been rounded down to the closest whole share. Information related to shares of common stock authorized for issuance, convertible preferred stock and warrants to purchase convertible preferred stock has not been retroactively adjusted for the reverse stock split as there was no change in capital structure for these shares. Use of Estimates The preparation of consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. The significant estimates made by management affect revenue, the allowance for doubtful accounts, intangible assets, including goodwill, loss contingencies, including the Company’s accrual for federal fees and sales tax liability, accrued liabilities, stock-based compensation, fair value calculations of the convertible preferred and common stock warrant liabilities, provision for income taxes and uncertain tax positions. Management periodically evaluates such estimates and they are adjusted prospectively based upon such periodic evaluation. Actual results could differ from those estimates. Significant Accounting Policies The Company’s significant accounting policies are disclosed in the prospectus (dated April 3, 2014) filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933 on April 4, 2014. During the six months ended June 30, 2014, there were no changes to our significant accounting policies. Recent Accounting Pronouncements On May 28, 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The new standard is effective for the Company's annual and interim reporting periods beginning January 1, 2017. Early application is not permitted. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that ASU 2014-09 will have on its consolidated financial statements and related disclosures. The Company has not yet selected a transition method nor has it determined the effect of the standard on its ongoing financial reporting. In July 2013, the FASB issued ASU No. 2013-11 on the financial statement presentation of unrecognized tax benefits. The new guidance provides that a liability related to an unrecognized tax benefit would be presented as a reduction of a deferred tax asset for a net operating loss carryforward, a similar tax loss or a tax credit carryforward if such settlement is required or expected in the event the uncertain tax position is disallowed. The Company adopted the guidance prospectively in the quarter ended March 31, 2014, and such adoption did not have a material impact on the Company's condensed consolidated financial statements.

Fair Value Measurements

6 Months Ended

Jun. 30, 2014

Fair Value Disclosures [Abstract]

Fair Value Disclosures

2. Fair Value Measurements

The Company carries certain financial assets and liabilities consisting of money market funds, certificates of deposit and its convertible preferred and common stock warrant liabilities at fair value on a recurring basis. Fair value is based on the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement:

Level 1 — Observable inputs which include unadjusted quoted prices in active markets for identical assets or liabilities.

Level 2 — Observable inputs other than Level 1 inputs, such as quoted prices for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the asset or liability.

Level 3 — Unobservable inputs that are supported by little or no market activity and that are based on management’s assumptions, including fair value measurements determined by using pricing models, discounted cash flow methodologies or similar techniques.

The fair value of assets and liabilities carried at fair value was determined using the following inputs (in thousands):



	June 30, 2014
	Total		Level 1
Assets
Short-term investments:
U.S. Treasury bills	$	29,995	$	29,995

	December 31, 2013
	Total		Level 1		Level 3
Assets
Cash equivalents:
Money market funds	$	738	$	738	$	—
Liabilities
Convertible preferred stock warrant liability	3,935		—		3,935

A reconciliation of the convertible preferred and common stock warrants measured and recorded at fair value on a recurring basis, using significant unobservable inputs (Level 3) is as follows (in thousands):



	Three Months Ended					Six Months Ended
	June 30, 2014			June 30, 2013		June 30, 2014			June 30, 2013
Balance as of beginning of period	$	2,647		$	1,749	$	3,935		$	1,979
Changes in fair value of convertible preferred stock warrants	—			785		(1,233		)	555
Exercise of Series A-2 convertible preferred stock warrants	—			—		(509		)	—
Issuance of common stock warrants in connection with debt agreement	—			—		966			—
Changes in fair value of common stock warrants	—			—		(512		)	—
Reclassified to additional paid-in capital	(2,647		)	—		(2,647		)	—
Balance as of end of period	$	—		$	2,534	$	—		$	2,534

In connection with the Company's IPO, all outstanding convertible preferred stock converted to common stock. As a result, as of April 3, 2014, liabilities associated with the convertible preferred stock warrants have been reclassified to additional paid-in capital because all of these warrants to purchase convertible preferred stock have become warrants to purchase common stock. Further, all the liability-classified common stock warrants became indexed to the Company's own equity upon the IPO, resulting in reclassification of the liability to additional paid-in capital.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Cash, Cash Equivalents and Short-Term Investments Cash, Cash Equivalents and Short-Term Investments

6 Months Ended

Jun. 30, 2014

Cash, Cash Equivalents, and Short-term Investments [Abstract]

Cash, Cash Equivalents, and Short-term Investments [Text Block]

3. Cash, Cash Equivalents and Short-Term Investments

The Company classifies all investments with original maturities of three months or less from date of purchase as cash equivalents and all investments with original maturities of greater than three months from the date of purchase as short-term investments. The Company classifies its investments in marketable securities as available-for-sale at the time of purchase and as a result, classifies such investments, including securities with maturities beyond twelve months, as current assets in the accompanying condensed consolidated balance sheets. The carrying values of all of the Company’s short-term investments approximate fair value.

Cash and cash equivalents consisted of the following (in thousands):



	June 30, 2014		December 31, 2013
Cash and cash equivalents:
Cash	$	61,577	$	17,010
Money market funds	—		738
Total cash and cash equivalents	$	61,577	$	17,748

As of June 30, 2014, short-term investments consisted of the following (in thousands):



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Aggregate Fair Value
U.S. Treasury bills	$	29,995	$	—	$	—	$	29,995

As of June 30, 2014, the Company's short-term investments will mature in approximately 4 months.

Restricted Cash

As of June 30, 2014 and December 31, 2013, the Company had restricted cash of $0.7 million classified in other assets on the accompanying condensed consolidated balance sheets, which related to a letter of credit issued to the Company’s landlord with respect to its lease obligation for its corporate headquarters in San Ramon, California. As of June 30, 2014 and December 31, 2013, the Company also had $0.1 million of restricted cash classified in other assets on the accompanying condensed consolidated balance sheet under a letter of credit related to an insurance policy.

Financial Statement Components

6 Months Ended

Jun. 30, 2014

Financial Statement Components [Abstract]

Financial Statement Components

4. Financial Statement Components

Accounts receivable, net consisted of the following (in thousands):



	June 30, 2014			December 31, 2013
Trade accounts receivable	$	6,761		$	6,430
Unbilled trade accounts receivable, net of advance client deposits	366			582
Allowance for doubtful accounts	(29		)	(42		)
Accounts receivable, net	$	7,098		$	6,970

Property and equipment, net consisted of the following (in thousands):



	June 30, 2014			December 31, 2013
Computer and network equipment	$	21,404		$	18,851
Computer software	1,603			1,550
Development costs	286			285
Furniture and fixtures	980			792
Leasehold improvements	591			539
Property and equipment	24,864			22,017
Accumulated depreciation and amortization	(13,343		)	(10,410		)
Property and equipment, net	$	11,521		$	11,607

Depreciation and amortization expense associated with property and equipment was $1.6 million and $3.0 million for the three and six months ended June 30, 2014, respectively, and $0.9 million and $1.8 million or the three and six months ended June 30, 2013, respectively.

Property and equipment capitalized under capital lease obligations consist primarily of computer and network equipment and were as follows (in thousands):



	June 30, 2014			December 31, 2013
Gross	$	17,739		$	15,123
Less: accumulated depreciation and amortization	(8,158		)	(5,591		)
Total	$	9,581		$	9,532

Accrued and other current liabilities consisted of the following (in thousands):



	June 30, 2014		December 31, 2013
Accrued expenses	$	2,885	$	2,453
Accrued compensation and benefits	5,267		3,476
Accrued and other current liabilities	$	8,152	$	5,929

Intangible Assets

6 Months Ended

Jun. 30, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets Disclosure

5. Intangible Assets

The components of intangible assets, which were acquired in connection with the Company’s acquisition of Face It, Corp., which we refer to as SoCoCare, a social engagement and mobile customer care solution provider, in October 2013, were as follows (in thousands):



	June 30, 2014							December 31, 2013
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Developed technology	$	2,460	$	(248	)	$	2,212	$	2,460	$	(72	)	$	2,388
Customer relationships	520		(73		)	447		520		(21		)	499
Domain names	50		(7		)	43		50		(2		)	48
Non-compete agreements	140		(33		)	107		140		(10		)	130
Total	$	3,170	$	(361	)	$	2,809	$	3,170	$	(105	)	$	3,065

Amortization expense related to intangible assets was $0.1 million and $0.3 million for the three and six months ended June 30, 2014, respectively. As of June 30, 2014, the expected future amortization expense for intangible assets was as follows (in thousands):



Period	Expected Future Amortization Expense
Remainder of 2014	$	256
2015	512
2016	503
2017	465
2018	442
2019 and beyond	631
Total	$	2,809

Short-Term and Long-Term Debt

6 Months Ended

Jun. 30, 2014

Debt Disclosure [Abstract]

Debt Disclosure

6. Short-Term and Long-Term Debt

Loan and Security Agreement

In March 2013, the Company entered into a loan and security agreement (“Loan and Security Agreement”) with a lender for a revolving line of credit (the “Credit Facility”) of up to $12.5 million. The Loan and Security Agreement is collateralized by substantially all the assets of the Company. Under the terms of the Credit Facility, the balance outstanding cannot exceed the lesser of (i) $12,500,000 or (ii) an amount equal to the Company’s monthly recurring revenue for the three months prior multiplied by the average Dollar-Based Retention Rate over the prior twelve months, less the amount accrued for the Company’s USF obligation (accrued federal fees). The Credit Facility carries a variable annual interest rate of the prime rate plus 1.25% and matures in March 2015. As of June 30, 2014, the full amount available under the Credit Facility of $12.5 million was outstanding and has been disclosed as part of 'Current liabilities' in the condensed consolidated balance sheets.

In connection with the Company’s acquisition of SoCoCare in October 2013, the Company amended its Loan and Security Agreement and borrowed an additional $5.0 million under a term loan (the “Term Loan”) to be used for acquisition-related costs. Monthly interest-only payments are due on the advance at the prime rate plus 1.50% through September 2014. Principal and interest payments are due in equal monthly installments from October 2014 through the maturity of the Term Loan in March 2017. In connection with the Term Loan, the Company issued a warrant to purchase 52,054 shares of its Series D-2 convertible preferred stock at an exercise price of $1.441 per share. The issuance date fair value of this warrant of $0.1 million was recorded as a discount against the debt and is being recognized as additional interest expense over the term of the loan. Upon the effectiveness of the Company’s registration statement filed with the SEC and the effectiveness of the 4:1 reverse stock split on April 3, 2014, this warrant became a warrant to purchase 13,013 shares of common stock at an exercise price of $5.76 per share.

The Loan and Security Agreement contains certain covenants, including the requirement that the Company maintain $5.5 million of cash deposited with the lender for the term of the Loan and Security Agreement. The Company was in compliance with these covenants as of June 30, 2014. The Loan and Security Agreement remains senior to other debts, including the debt issued under the 2014 Loan and Security Agreement discussed below.

2014 Loan and Security Agreement

In February 2014, the Company entered into a loan and security agreement (the “2014 Loan and Security Agreement”) with a syndicate of two lenders ("Lenders") for a term loan facility of $30.0 million. The Lenders agreed to provide the Company this term loan facility pursuant to the terms of promissory notes issued under this Loan Agreement. The term loan facility is available to the Company in tranches; the first tranche for $20.0 million was advanced upon the closing of the agreement and the remaining $10.0 million is available for drawdown by the Company until February 2015 in tranches in $1.0 million increments. During the month of February 2014, the Company borrowed the first tranche of $20.0 million and incurred $0.4 million in debt issuance costs. The term loan bears interest at a variable per annum rate equal to the greater of 10% or LIBOR plus 9%. Interest is due and payable on the last business day of each month during the term of the loan commencing in February 2014. Monthly principal payments are due beginning in February 2016 based on 1/60th of the outstanding balance at that time and will continue until all remaining principal outstanding under the term loan becomes due and payable in February 2019. The term loan is secured by substantially all the assets of the Company and is subordinate to the Loan and Security Agreement. All amounts outstanding under this loan facility have been disclosed as part of 'Notes payable' in the condensed consolidated balance sheet as of June 30, 2014.

In connection with entering into the 2014 Loan and Security Agreement, the Company issued to the Lenders warrants to purchase 177,865 shares of common stock at $10.12 per share, which vest and become exercisable, over a ten year term from the date of issuance, based on amounts drawn under the $30.0 million term loan facility. The exercise price of such warrants was subject to adjustment in the event of issuances of common stock by the Company at a price lower than the exercise price of such warrants any time prior to the date of effectiveness of the Company’s IPO and other corporate actions. Therefore, upon issuance the warrants were classified as a liability to the Company, which has been reclassified to additional paid-in capital upon the Company's IPO at which time these warrants were indexed to the Company's common stock. Based on the drawdown of $20.0 million in February 2014, 118,577 shares of common stock issuable under the warrants vested and are exercisable by the Lenders. As of June 30, 2014, 59,288 shares of common stock issuable under the warrants pertaining to the undrawn $10.0 million remain unvested.

The fair value of the vested warrants of $1.0 million was recorded as a discount against the debt proceeds and is being recognized as additional interest expense over the term of the loan.

Promissory Note

In July 2013, the Company issued a promissory note to the Universal Service Administrative Company ("USAC") for $4.1 million as a financing arrangement for that amount of accrued federal fees. The promissory note carries a fixed annual interest rate of 12.75% and is repayable in 42 equal monthly installments of principal and interest beginning in August 2013. As of June 30, 2014 and December 31, 2013, approximately $3.2 million and $3.7 million, respectively, of this promissory note was outstanding and is included as notes payable in the accompanying condensed consolidated balance sheets.

As of June 30, 2014 and December 31, 2013, the Company’s outstanding debt is summarized as follows (in thousands):



	June 30, 2014			December 31, 2013
Notes payable	$	28,176		$	8,695
Less discount	(1,356		)	(78		)
Net carrying value of notes payable	26,820			8,617

Notes payable, current portion	2,573			1,522
Notes payable, less current portion	24,247			7,095
Revolving line of credit, current portion	12,500			—
Revolving line of credit, less current portion	—			12,500
Net carrying value of total debt	$	39,320		$	21,117
Total debt, current portion	15,073			1,522
Total debt, less current portion	24,247			19,595

Maturities of the Company’s outstanding debt as of June 30, 2014 are as follows (in thousands):



Period	Amount to Mature
Remainder of 2014	$	1,036
2015	15,680
2016	7,007
2017	4,620
2018	4,000
2019	8,333
Total	$	40,676

Stockholders' Equity (Deficit)

6 Months Ended

Jun. 30, 2014

Equity [Abstract]

Stockholders' Deficit

7. Stockholders’ Equity (Deficit)

Capital Structure

Prior to the IPO (Note 1), the Company had outstanding 75,643,683 shares of Series A-2 convertible preferred stock, 18,565,794 shares of Series B-2 convertible preferred stock, 12,903,226 shares of Series C-2 convertible preferred stock, and 15,269,294 shares of Series D-2 convertible preferred stock. Each share of convertible preferred stock was convertible to one share of common stock upon receipt of the required consent of preferred stockholders or upon conclusion of qualified IPO.

In March 2014, the Company’s board of directors and stockholders adopted an amendment to the Company’s certificate of incorporation to effect a reverse stock split of the Company's outstanding common stock at a ratio of 4:1. Accordingly, on April 3, 2014, the reverse stock split was effected such that, (i) each 4 shares of the then-outstanding common stock was reduced to one share of common stock; (ii) the number of shares issuable upon exercise of outstanding options and warrants to purchase common stock was proportionately reduced; and (iii) the exercise price of all outstanding warrants or stock options to purchase common stock was proportionately increased.

On April 3, 2014, immediately prior to the effectiveness of the Company’s registration statement filed with the SEC and the reverse stock split being effected, all shares of the Company's outstanding convertible preferred stock converted into common stock on a 1:1 basis. Upon the consummation of the IPO and the 4:1 reverse stock split on April 3, 2014, all then-outstanding convertible preferred stock converted into 30,595,477 shares of common stock.

In connection with the Company's IPO, the Company amended and restated its certificate of incorporation ("Amended and Restated Certificate of Incorporation"), pursuant to which the Company is authorized to issue 450,000,000 shares of common stock and 5,000,000 shares of preferred stock, both with a par value of $0.001 per share. The Amended and Restated Certificate of Incorporation was filed with the Delaware Secretary of State, and became effective on April 8, 2014.

As of June 30, 2014, there were 48,405,953 shares of common stock issued and outstanding and no shares of preferred stock issued and outstanding.

Common Stock Subject to Repurchase or Forfeiture

In connection with employment and service agreements entered into in connection with the Company’s acquisition of SoCoCare in October 2013 ("Acquisition Date"), the Company issued 118,577 shares of unvested restricted common stock, the vesting of which is contingent upon continuing employment or services and subject to forfeiture. The forfeiture rights lapse 50% on the first anniversary of the Acquisition Date and an additional 50% on the second anniversary of the Acquisition Date. These shares were valued at $1.0 million, based on the Acquisition Date fair value of the Company’s common stock. This amount is being recorded as stock-based compensation on a straight-line basis over the two-year requisite service period. The 118,577 shares that are subject to forfeiture are included in issued and outstanding shares of common stock as of June 30, 2014. For the three and six months ended June 30, 2014, $0.2 million and $0.4 million, respectively, was included as stock-based compensation expense related to these shares.

In addition, the Company has the right to repurchase, at the original exercise price, unvested common shares issued pursuant to the early exercise of stock options upon termination of service of an employee. The consideration received for an early exercise of an unvested option is considered to be a deposit of the exercise price, and the related dollar amount is recorded as a liability. The liability is reclassified as equity as the award vests. As of June 30, 2014, a liability of $0.1 million related to 19,550 unvested shares of common stock has been included in 'Accrued and other current liabilities' in the condensed consolidated balance sheets. These exercised but unvested shares were included in issued and outstanding shares of common stock as of June 30, 2014.

Warrants

As of June 30, 2014, the Company had outstanding warrants to purchase 359,596 shares of common stock with a weighted-average exercise price of $5.59 per share, which expire on various dates between November 2016 and February 2024. During the three and six months ended June 30, 2014, 161,979 shares and 203,536 shares of common stock, respectively, were issued as a result of exercises of common stock warrants at an exercise price of $0.652 per share.

Prior to the IPO, the Company had issued Series A-2 and Series D-2 convertible preferred stock warrants and common stock warrants to certain investors and lenders in connection with its debt agreements.

Series A-2 Convertible Preferred Stock Warrants — Prior to the preferred stock conversion and the reverse stock split effected in connection with the Company’s IPO, the Company had outstanding warrants to purchase 1,335,041 shares of Series A-2 convertible preferred stock with an exercise price of $0.163 per share, which expire on various dates between February 2015 and June 2020.

In March 2014, warrants to purchase 175,582 shares of Series A-2 convertible preferred stock were fully exercised under the cashless exercise method available under the warrant. Upon such exercise, the Company issued 166,228 shares of Series A-2 convertible preferred stock. Consequently, these instruments were no longer accounted for as liabilities. These preferred stock warrants were remeasured to their fair value as of the exercise date and the applicable fair value related to these warrants of $0.5 million was reclassified from liability to 'Additional paid-in capital' in the condensed consolidated balance sheets.

Series D-2 Convertible Preferred Stock Warrants — Prior to the preferred stock conversion and the reverse stock split effected in connection with the Company’s IPO, the Company had an outstanding warrant to purchase 52,054 shares of Series D-2 convertible preferred stock with an exercise price of $1.441 per share that expires in October 2023.

Upon the preferred stock conversion and the 4:1 reverse stock split on April 3, 2014, all then-outstanding Series A-2 and Series D-2 convertible preferred stock warrants became warrants to purchase 346,764 shares of common stock. Subsequent to the IPO and through June 30, 2014, warrants to purchase 165,040 shares of common stock, which were formerly warrants to purchase Series A-2 convertible preferred stock, were fully exercised, some of which pursuant to the cashless exercise method. Upon such exercises, the Company issued 161,979 shares of common stock.

Common Stock Warrants - As of June 30, 2014 and December 31, 2013, the Company had outstanding warrants to purchase 7 shares of common stock with an exercise price of $3,800.00 per share, which expire on various dates between November 2016 and August 2017.

In February 2014, in connection with the 2014 Loan and Security Agreement, the Company issued warrants to purchase up to 177,865 shares of common stock, to the extent vested, with an exercise price of $10.12 per share, which expire in February 2024. In February 2014, these warrants were vested with respect to 118,577 shares of common stock.

Fair Value of Warrants

The Company estimates the fair value of each liability-classified warrant on the date of issuance and at each reporting date using the Black-Scholes option-pricing model and using the assumptions noted in the below table. Expected volatility is based upon the historical and implied volatility of a peer group of publicly traded companies. The expected term of warrants represents the contractual term of the warrants. The risk-free rate for the expected term of the warrants is based on the U.S. Treasury Constant Maturity at the time of issuance.

The fair value of the convertible preferred stock warrants and the liability-classified common stock warrants at April 3, 2014 and December 31, 2013 was determined using the Black-Scholes option-pricing model with the following assumptions:



	IPO Date April 3, 2014			December 31, 2013
Fair value of Series A-2 preferred stock	$	1.75	(1)	$	2.69
Fair value of Series D-2 preferred stock	$	1.75	(1)	$	2.81
Fair value of common stock	$	7.00	(1)	*
Risk-free interest rate	0.13% to 2.73%			0.33% to 2.60%
Expected life	Remaining contractual life			Remaining contractual life
Expected dividends	—			—
Volatility	40% - 50%			45.0 %

(1) Fair value of the underlying stock is based on the Company's initial public offering price of $7.00 per share calculated on a pre-reverse split basis for preferred stock and post-reverse split basis for common stock.
* There were no liability-classified common stock warrants at December 31, 2013.

On April 3, 2014, upon the effectiveness of the Company's registration statement filed with the SEC for the IPO, the fair value of the Company’s convertible preferred stock warrants and liability-classified common stock warrants of $2.6 million was reclassified from liability to additional paid-in capital in the condensed consolidated balance sheets. Fair value of these warrants on the date of the re-classification was equal to their carrying value.

Common Stock Reserved for Future Issuance

Shares of common stock reserved for future issuance related to outstanding warrants, stock options and restricted stock units were as follows (in thousands):



		June 30, 2014
Stock options outstanding		7,145
Restricted stock units outstanding		262
Shares available for future grant under 2014 Plan		5,276
Shares available for future issuance under ESPP		880
Common stock warrants outstanding		360
Total shares of common stock reserved		13,923

Equity Incentive Plans

Prior to the IPO, the Company granted stock options under its Amended and Restated 2004 Equity Incentive Plan, as amended (the “2004 Plan”). The 2004 Plan was adopted in June 2004 and most recently amended in March 2014 to increase the total stock options available for issuance to 11,982,832 to eligible employees, non-employee consultants and directors. In March 2014, the Company’s stockholders and board of directors approved an increase in the shares of common stock reserved under the 2004 Plan by 100,000 shares (on a post-reverse stock split basis).

Under the terms of the 2004 Plan, the Company has the ability to grant incentive and nonstatutory stock options. Incentive stock options could only be granted to Company employees. Nonstatutory stock options could be granted to Company employees, directors and consultants. Such options are exercisable at prices, as determined by the board of directors, generally equal to the fair value of the Company’s common stock at the date of grant. Options granted to employees generally vest over a four-year period, with an initial vesting period of 12 months for 25% of the shares, and the remaining 75% of the shares vesting monthly on a ratable basis over the remaining 36 months. Options generally expire ten years after the grant date and are generally exercisable upon vesting. Vested options generally expire 90 days after termination of the optionee’s employment or relationship as a consultant or director, unless otherwise extended by the terms of the stock option agreement. Any unvested options or expired options are returned to the 2004 Plan.

In March 2014, the Company’s stockholders and the board of directors approved the 2014 Equity Incentive Plan (“2014 Plan”) and 5,300,000 shares of common stock were authorized for issuance under the 2014 Plan. In addition, on the first day of each year beginning in 2015 and ending in 2024, the 2014 Plan provides for an annual automatic increase to the shares reserved for issuance. The 2014 Plan became effective on April 3, 2014. Upon the Company’s IPO, no future grants will be made under the 2004 Plan. All shares reserved under the 2004 Plan became available for grant under the 2014 Plan. Any forfeited or expired shares that would otherwise return to the 2004 Plan after the IPO will instead return to the 2014 Plan.

The 2014 Plan allows the Company to grant stock options, restricted stock units ("RSU"), restricted stock awards, performance stock awards, stock appreciation rights, performance cash awards, and other stock awards. To date, the Company has granted stock options and RSUs under the 2014 Plan. Stock options are granted under the 2014 Plan in general at a price not less than 100% of the fair market value of the common stock on the date of grant and vest over four years. The Company's stock options expire ten years from the date of grant. Each RSU granted under the 2014 Plan represents a right to receive one share of the Company’s common stock when the RSU vests. RSUs generally vest over one to four years.

Stock Options

A summary of the Company’s stock option activities during the six months ended June 30, 2014 is as follows (in thousands, except years and per share data):



	Number of Shares Outstanding		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
Outstanding as of December 31, 2013	7,633		$	3.30
Options granted (weighted average grant date fair value of $5.91 per share)	441		11.02
Options exercised	(655	)	1.10
Options forfeited or expired	(274	)	3.44
Outstanding as of June 30, 2014	7,145		$	3.97	7.17	$	28,019

The Company has computed the aggregate intrinsic value amounts disclosed in the above table based on the difference between the original exercise price of the options and the fair market value of the Company’s common stock of $7.20 as of June 30, 2014 for all in-the-money options outstanding. As of June 30, 2014, there was $10.9 million of unrecognized compensation cost related to unvested stock options, net of estimated forfeitures, which is expected to be recognized over a weighted-average period of 3.2 years.

Restricted Stock Units

The Company commenced granting RSUs to employees upon the effectiveness of the 2014 Plan on April 3, 2014. During the three months ended June 30, 2014, 262,438 RSUs were granted with a weighted-average grant date fair value of $7.19 per share. During the three months ended June 30, 2014, no RSUs vested. As of June 30, 2014, there was $1.4 million of unrecognized compensation cost related to unvested RSUs, net of estimated forfeitures, which is expected to be recognized over a weighted-average period of 1.6 years.

Employee Stock Purchase Plan

In March 2014, the Company’s stockholders and the board of directors adopted the 2014 Employee Stock Purchase Plan (“ESPP”), and the shares authorized for issuance thereunder. The ESPP became effective on April 3, 2014.

Except for the initial offering period after the IPO, an offering period under the ESPP is 12 months commencing on May 16 of each year and includes two 6-month purchase periods, with purchases on November 15 and May 15. The initial offering period commenced on April 3, 2014 with two purchases on November 15, 2014 and May 15, 2015. The ESPP permits eligible employees to purchase shares of the Company’s common stock through payroll deductions with up to 15% of their pre-tax earnings subject to certain Internal Revenue Code limitations. In addition, no participant may purchase more than 1,500 shares of common stock in each purchase period. The purchase price of the shares is 85% of the lower of the fair market value of the Company’s common stock on the first day of an offering period or the date of purchase. For the initial offering period after the IPO, the purchase price of the shares is 85% of the lower of the Company’s IPO price of $7.00 per share or the market price on the date of purchase.

The number of shares of common stock reserved for issuance under the ESPP is 880,000 shares, which will increase automatically each year, beginning on January 1, 2015 and continuing through January 1, 2024, by the lesser of (i) 1% of the total number of shares of our common stock outstanding on December 31 of the preceding calendar year; (ii) 1,000,000 shares of common stock (subject to adjustment to reflect any split or combination of our common stock); or (iii) such lesser number as determined by the Company’s board of directors.

As of June 30, 2014, no purchases have been made under the ESPP. As of June 30, 2014, there was $0.8 million of unrecognized compensation cost related to purchase rights under the ESPP, which is expected to be recognized over a weighted-average period of 0.9 years.

Stock-Based Compensation

Stock-based compensation expenses for the three and six months ended June 30, 2014 and 2013 are as follows (in thousands):



	Three Months Ended				Six Months Ended
	June 30, 2014		June 30, 2013		June 30, 2014		June 30, 2013
Cost of revenue	$	121	$	44	$	208	$	76
Research and development	471		49		821		102
Sales and marketing	368		134		694		239
General and administrative	763		77		1,196		151
Total stock-based compensation	$	1,723	$	304	$	2,919	$	568

The Company recognizes stock-based compensation expense that is calculated based upon awards ultimately expected to vest and, thus, stock-based compensation expense is reduced for estimated forfeitures. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates.

All stock-based compensation for equity awards granted to employees and directors is measured based on the grant date fair value of the award. Prior to the IPO, the Company estimated the fair value of its common stock utilizing periodic contemporaneous valuations prepared by an independent third-party appraiser based upon several factors, including its operating and financial performance, progress and milestones attained in its business, and past sales of convertible preferred stock. Upon the effectiveness of the IPO, the fair value of the Company's common stock is the closing market price of the Company's common stock as of the measurement date.

The Company values RSUs at the fair value of the Company’s common stock on the date of grant.

The Company estimates the fair value of each stock option and purchase right under the ESPP granted to employees on the date of grant using the Black-Scholes option-pricing model and using the assumptions noted in the below table. Expected volatility is based upon the historical volatility of a peer group of publicly traded companies. The expected term of options granted is estimated by taking the average of the vesting term and the contractual term of the option. The risk-free rate for the expected term of the awards is based on U.S. Treasury zero-coupon issues at the time of grant. The weighted-average assumptions used to value stock options and purchase rights under the ESPP granted during the three and six months ended June 30, 2014 and 2013 were as follows:



Stock Options	Three Months Ended		Six Months Ended
	June 30, 2014	June 30, 2013	June 30, 2014	June 30, 2013
Expected term (years)	6.1	6.1	6.1	6.1
Volatility	56%	60%	56%	60%
Risk-free interest rate	1.9%	1.0%	1.8%	1.1%
Dividend yield	—	—	—	—



ESPP	Three Months Ended		Six Months Ended
	June 30, 2014	June 30, 2013	June 30, 2014	June 30, 2013
Expected term (years)	0.8	*	0.8	*
Volatility	39%	*	39%	*
Risk-free interest rate	0.1%	*	0.1%	*
Dividend yield	—	*	—	*

* The ESPP was effective on April 3, 2014.

Net Loss Per Share

6 Months Ended

Jun. 30, 2014

Earnings Per Share [Abstract]

Net Loss Per Share

8. Net Loss Per Share

Basic net loss per share is calculated by dividing net loss by the weighted average number of common shares outstanding during the period, and excludes any dilutive effects of employee stock-based awards and warrants. Diluted net income per share is computed giving effect to all potentially dilutive common shares, including common stock issuable upon exercise of stock options and warrants. As the Company had net losses for the three and six months ended June 30, 2014 and 2013, all potential common shares were determined to be anti-dilutive.

The following table presents the calculation of basic and diluted net loss per share (in thousands):



	Three Months Ended						Six Months Ended
	June 30, 2014			June 30, 2013			June 30, 2014			June 30, 2013
Net loss	$	(8,659	)	$	(8,290	)	$	(16,979	)	$	(14,947	)
Weighted-average shares used in computing basic and diluted net loss per share	46,898			3,684			26,367			3,610
Basic and diluted net loss per share	$	(0.18	)	$	(2.25	)	$	(0.64	)	$	(4.14	)

The following securities were excluded from the calculation of diluted net loss per share attributable to common stockholders because their effect would have been anti-dilutive for the periods presented (in thousands):



	June 30, 2014	June 30, 2013
Convertible preferred stock (on an as converted post reverse stock split basis)	—	30,554
Stock options	7,145	6,049
Restricted stock units	262	—
ESPP	474	—
Common stock warrants	360	—
Convertible preferred stock warrants (on an as converted post reverse stock split basis)	—	378
Common stock subject to repurchase or forfeiture	138	—
Total	8,379	36,981

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2014
Income Tax Disclosure [Abstract]
Income Tax Disclosure	9. Income Taxes The provision for income taxes for the three and six months ended June 30, 2014 was approximately $12 thousand and $39 thousand, respectively. The provision for income taxes for the three and six months ended June 30, 2013 was approximately $5 thousand and $24 thousand, respectively. The provision for income taxes consisted primarily of foreign income taxes. For the three and six months ended June 30, 2014 and 2013, the provision for income taxes differed from the statutory amount primarily due to state and foreign taxes currently payable, and the Company realized no benefit for current year losses due to maintaining a full valuation allowance against its domestic and foreign net deferred tax assets. The realization of tax benefits of deferred tax assets is dependent upon future levels of taxable income, of an appropriate character, in the periods the items are expected to be deductible or taxable. Based on the available objective evidence, the Company does not believe it is more likely than not that the net deferred tax assets will be realizable. Accordingly, the Company has provided a full valuation allowance against the domestic and foreign net deferred tax assets as of June 30, 2014 and December 31, 2013. The Company intends to maintain the remaining valuation allowance until sufficient positive evidence exists to support a reversal of, or decrease in, the valuation allowance. During the three and six months ended June 30, 2014, there have been no material changes to the total amount of unrecognized tax benefits.

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure	10. Commitments and Contingencies Commitments The Company’s principal commitments consist of obligations under operating leases for office space and facilities in the United States, and agreements with third parties to provide colocation hosting and telecommunication usage services. These commitments as of December 31, 2013 are disclosed in the Company’s prospectus (dated April 3, 2014) filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933 on April 4, 2014, and did not change materially during the six months ended June 30, 2014 except for the following agreements entered into in 2014. In January 2014, the Company modified its corporate office lease to expand its existing space for an additional commitment of $0.6 million over the term of the original lease. In June 2014, the Company entered into an agreement for colocation hosting services in the U.K. for a term of 36 months commencing in July 2014. This agreement requires the Company to make monthly payments over the service term in exchange for certain guarantees of network availability. The Company's total minimum future payment commitments under this agreement are $0.6 million. Universal Services Fund Liability During the third quarter of 2012, the Company determined that based on its business activities, it is classified as a telecommunications service provider for regulatory purposes and it should make direct contributions to the USF based on revenues it receives from the resale of interstate and international telecommunications services. Previously, the Company had believed that the telecommunications services were an integral part of an information service that the Company provides via its software and had instead made indirect USF contributions via payments to its wholesale telecommunications service providers. In order to comply with the obligation to make direct contributions, the Company has made a voluntary self-disclosure to the Federal Communications Commission (“FCC”) Enforcement Bureau and has registered with the Universal Service Administrative Company (“USAC”), which is charged by the FCC with administering the USF. The Company has filed exemption certificates with its wholesale telecommunications service providers in order to eliminate its obligation to reimburse such wholesale telecommunications service providers for their USF contributions calculated on services sold to the Company. The Company’s registration with USAC subjects it to assessments for unpaid USF contributions, as well as interest thereon, due to its late registration and reporting of revenues. The Company will be required to pay assessments for periods prior to the Company’s registration. While the Company is in discussions with the FCC to limit such back assessments to the period 2008 through 2012, it is possible that it will be required to pay back assessments for the period from 2003 through 2007. The Company will also face a regulatory and contractual challenge in seeking recovery or credit for its USF reimbursement payments previously made to its wholesale telecommunications service providers of up to $3.1 million as of June 30, 2014 and December 31, 2013. Finally, the Company is exposed to the potential assessment by the FCC of monetary penalties due to its past failure to recognize its obligation as a USF contributor. The Company believes it may be able to reduce such penalties as a result of the Company’s voluntary self-disclosure. In July 2013, the Company and USAC agreed to a financing arrangement for the undisputed portion of the unpaid USF contributions and related interest for the periods 2008 through 2012 whereby the Company issued to USAC a promissory note payable in the amount of $4.1 million. The repayment terms of the promissory note payable are disclosed in Note 6. As of June 30, 2014, the balance of the promissory note payable was $3.2 million and included in the notes payable amounts on the condensed consolidated balance sheets. In addition to the promissory note payable, the Company had an accrued liability for USF contributions and related interest and penalties of $4.4 million and $4.2 million included in accrued federal fees on the condensed consolidated balance sheets as of June 30, 2014 and December 31, 2013, respectively, of which $0.8 million pertains to periods prior to 2008. For the three and six months ended June 30, 2014, the Company incurred expenses related to its USF obligations of $1.1 million and $2.2 million, respectively. For the three and six months ended June 30, 2013, the Company incurred expenses related to its USF obligations of $0.9 million and $1.9 million, respectively. These expenses were recorded as a charge to cost of revenue. No amounts related to the potential recovery or credit of USF contributions paid by the Company to its wholesale telecommunications service providers were recognized in the accompanying condensed consolidated financial statements. State and Local Taxes and Surcharges During 2011, the Company conducted an analysis of the taxability of sales of its subscription services. It was determined that the Company’s activities may be asserted by a number of states to create nexus and thus an obligation to collect sales taxes on sales of subscriptions to clients in certain states. Prior to April 2012, the Company did not collect sales taxes related to these sales from its clients. In April 2012, the Company commenced collecting and remitting sales taxes on sales of subscription services in all applicable states. As of June 30, 2014 and December 31, 2013, the Company had an accrued sales tax liability related to its sales of subscriptions of $0.1 million. During 2013, the Company further analyzed its activities and determined it may be obligated to collect and remit various state and local taxes and surcharges on its usage-based fees. The Company has remitted $0.9 million and $1.0 million of state and local taxes on usage-based fees during the three and six months ended June 30, 2014. As of June 30, 2014 and December 31, 2013, the Company had an accrued sales tax liability for this contingency of $2.4 million and $5.4 million, respectively. In May 2014, the Company received a letter from a state revenue authority which concluded that the Company's services provided to customers in that specific state are not subject to that state's local taxes. As a result, the Company released $2.8 million of sales tax liability, including estimated interest charges, accrued progressively on a quarterly basis from 2011 through the first quarter of 2014 for that state as we believe that the probability of loss being incurred is no longer probable. The reversal has been recorded through the general and administrative expense caption in the condensed consolidated statements of operations and comprehensive loss. This release of liability reduced the Company's net loss per basic and diluted share by $0.06 for the three months ended June 30, 2014 and $0.10 for the six months ended June 30, 2014. For the three and six months ended June 30, 2014, the Company recognized general and administrative expense related to its estimated sales tax liability on usage-based fees of $0.3 million and $0.8 million, respectively, in addition to the aforementioned credit of $2.8 million. For the three and six months ended June 30, 2013, the Company recorded general and administrative expense related to its estimated sales tax liability on usage-based fees of $0.5 million and $1.0 million, respectively. The Company’s estimate of the probable loss incurred under this contingency is based on analysis of the source location of its usage-based fees and the regulations and rules in each state. Legal Matters The Company is involved in various legal and regulatory matters arising in the normal course of business. In management’s opinion, resolution of these matters is not expected to have a material impact on the Company’s consolidated results of operations, cash flows, or its financial position. However, depending on the nature and timing of any such dispute, an unfavorable resolution of a matter could materially affect the Company’s future consolidated results of operations, cash flows or financial position in a particular period. The Company is currently involved in one lawsuit as a defendant. In April 2012, NobelBiz, Inc., a telecommunication solutions company, brought a patent infringement lawsuit in the U.S. District Court for the Eastern District of Texas against the Company seeking a permanent injunction, damages and attorneys' fees. The Company responded to the complaint and preliminary injunction request by asserting non-infringement and invalidity of the patent. In March 2013, the court granted the Company's motion to transfer the case to the U.S. District Court for the Northern District of California subsequent to which the complainant amended its claim to include another related patent. The Company has responded to this amended claim by continuing to assert non-infringement and invalidity of the patents. During December 2013, the court in California held a status conference and has subsequently scheduled a claim construction hearing regarding the patents to be held on August 22, 2014. No trial date or further schedule is anticipated until after the court in California issues its ruling as to claim construction following the hearing. The Company has investigated the claims alleged in the complaint and believes that it has good defenses to the claims. Accordingly, the Company has not accrued a loss related to this matter as the Company does not believe that it is probable that a loss will be incurred. The Company recognizes general and administrative expense for legal fees in the period the services are provided. Indemnification Agreements In the ordinary course of business, the Company may provide indemnifications of varying scope and terms to clients, vendors, lessors, business partners and other parties with respect to certain matters, including, but not limited to, losses arising out of breach of such agreements, services to be provided by the Company or from intellectual property infringement claims made by third parties. In addition, the Company has entered into indemnification agreements with its directors, officers and certain employees that require the Company, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors, officers or employees. No demands have been made upon the Company to provide indemnification under such agreements and thus there are no claims that the Company is aware of that would have a material effect on the Company’s condensed consolidated balance sheets, condensed consolidated statements of operations and comprehensive loss, or condensed consolidated statements of cash flows.

Geographical Information

6 Months Ended

Jun. 30, 2014

Segment Reporting [Abstract]

Geographical Information

11. Geographical Information

The following table is a summary of revenues by geographic region based on client billing address and has been estimated based on the amounts billed to clients during the periods (in thousands).



	Three Months Ended				Six Months Ended
	June 30, 2014		June 30, 2013		June 30, 2014		June 30, 2013
United States	$	22,816	$	17,884	$	45,250	$	34,426
International	1,869		2,399		3,709		4,972
Total revenue	$	24,685	$	20,283	$	48,959	$	39,398

The following table summarizes total property and equipment, net in the respective locations (in thousands).



	June 30, 2014		December 31, 2013
United States	$	10,827	$	11,079
International	694		528
Property and equipment, net	$	11,521	$	11,607

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8971-108599

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Subsequent Event	6 Months Ended
Subsequent Event	Jun. 30, 2014
Subsequent Events [Abstract]
Subsequent Event	12. Subsequent Event In July 2014, the Company entered into a capital lease agreement to finance data center and networking equipment and software purchases for a term of 36 months. Total minimum future payment commitments under this agreement are approximately $1.6 million over the lease term.

Description of Business and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company’s prospectus (dated April 3, 2014) filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933 on April 4, 2014. All intercompany transactions and balances have been eliminated in consolidation.
Initial Public Offering	Initial Public Offering On April 9, 2014, the Company consummated its initial public offering ("IPO") and issued and sold 10,000,000 shares of common stock at a public offering price of $7.00 per share, less the underwriters’ discount. In addition, on April 22, 2014, the Company consummated the sale of an additional 1,500,000 shares of common stock to the underwriters of the Company's IPO pursuant to the underwriters’ exercise in full of their option to purchase 1,500,000 shares of common stock from the Company at the IPO price of $7.00 per share, less the underwriters' discount. The Company received aggregate proceeds of $74.9 million from the IPO after deducting underwriters’ discounts and commissions of $5.6 million, but before deduction of offering expenses of approximately $4.2 million, of which $1.6 million had been paid by us prior to the IPO including $0.8 million paid during the three months ended March 31, 2014. The remaining $2.6 million of the offering expenses was paid in the three months ended June 30, 2014. On April 3, 2014, a reverse stock split of the Company's then-outstanding common stock at a ratio of 4:1 was effected in connection with the IPO. Prior to such reverse stock split being effected, all outstanding convertible preferred stock elected to convert to common stock on a 1:1 basis. In addition, upon the IPO, the Company’s outstanding convertible preferred stock warrants became warrants to purchase common stock and the Company’s outstanding common stock warrant liabilities became indexed to the Company's common stock and accordingly been reclassified to additional paid-in capital. In this quarterly report on Form 10-Q, all information related to common stock, warrants to purchase common stock, stock awards and earnings per share has been retroactively adjusted to give effect to the 4:1 reverse stock split, without any change in the par value per share. Fractional shares resulting from the reverse stock split have been rounded down to the closest whole share. Information related to shares of common stock authorized for issuance, convertible preferred stock and warrants to purchase convertible preferred stock has not been retroactively adjusted for the reverse stock split as there was no change in capital structure for these shares.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. The significant estimates made by management affect revenue, the allowance for doubtful accounts, intangible assets, including goodwill, loss contingencies, including the Company’s accrual for federal fees and sales tax liability, accrued liabilities, stock-based compensation, fair value calculations of the convertible preferred and common stock warrant liabilities, provision for income taxes and uncertain tax positions. Management periodically evaluates such estimates and they are adjusted prospectively based upon such periodic evaluation. Actual results could differ from those estimates.
Recent Accounting Pronouncements	Recent Accounting Pronouncements On May 28, 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The new standard is effective for the Company's annual and interim reporting periods beginning January 1, 2017. Early application is not permitted. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that ASU 2014-09 will have on its consolidated financial statements and related disclosures. The Company has not yet selected a transition method nor has it determined the effect of the standard on its ongoing financial reporting. In July 2013, the FASB issued ASU No. 2013-11 on the financial statement presentation of unrecognized tax benefits. The new guidance provides that a liability related to an unrecognized tax benefit would be presented as a reduction of a deferred tax asset for a net operating loss carryforward, a similar tax loss or a tax credit carryforward if such settlement is required or expected in the event the uncertain tax position is disallowed. The Company adopted the guidance prospectively in the quarter ended March 31, 2014, and such adoption did not have a material impact on the Company's condensed consolidated financial statements.

Fair Value Measurement (Tables)

6 Months Ended

Jun. 30, 2014

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Carried at Fair Value

The fair value of assets and liabilities carried at fair value was determined using the following inputs (in thousands):



	June 30, 2014
	Total		Level 1
Assets
Short-term investments:
U.S. Treasury bills	$	29,995	$	29,995

	December 31, 2013
	Total		Level 1		Level 3
Assets
Cash equivalents:
Money market funds	$	738	$	738	$	—
Liabilities
Convertible preferred stock warrant liability	3,935		—		3,935

Reconciliation of Stock Warrants Measured at Fair Value



	Three Months Ended					Six Months Ended
	June 30, 2014			June 30, 2013		June 30, 2014			June 30, 2013
Balance as of beginning of period	$	2,647		$	1,749	$	3,935		$	1,979
Changes in fair value of convertible preferred stock warrants	—			785		(1,233		)	555
Exercise of Series A-2 convertible preferred stock warrants	—			—		(509		)	—
Issuance of common stock warrants in connection with debt agreement	—			—		966			—
Changes in fair value of common stock warrants	—			—		(512		)	—
Reclassified to additional paid-in capital	(2,647		)	—		(2,647		)	—
Balance as of end of period	$	—		$	2,534	$	—		$	2,534

Cash, Cash Equivalents and Short-Term Investments Cash, Cash Equivalents and Short-Term Investments (Tables)

6 Months Ended

Jun. 30, 2014

Cash, Cash Equivalents, and Short-term Investments [Abstract]

Schedule of Cash and Cash Equivalents

Cash and cash equivalents consisted of the following (in thousands):



	June 30, 2014		December 31, 2013
Cash and cash equivalents:
Cash	$	61,577	$	17,010
Money market funds	—		738
Total cash and cash equivalents	$	61,577	$	17,748

Schedule of Short-Term Investments

As of June 30, 2014, short-term investments consisted of the following (in thousands):



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Aggregate Fair Value
U.S. Treasury bills	$	29,995	$	—	$	—	$	29,995

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details

Financial Statement Components (Tables)

6 Months Ended

Jun. 30, 2014

Financial Statement Components [Abstract]

Schedule of Accounts Receivable

Accounts receivable, net consisted of the following (in thousands):



	June 30, 2014			December 31, 2013
Trade accounts receivable	$	6,761		$	6,430
Unbilled trade accounts receivable, net of advance client deposits	366			582
Allowance for doubtful accounts	(29		)	(42		)
Accounts receivable, net	$	7,098		$	6,970

Schedule of Property and Equipment

Property and equipment, net consisted of the following (in thousands):



	June 30, 2014			December 31, 2013
Computer and network equipment	$	21,404		$	18,851
Computer software	1,603			1,550
Development costs	286			285
Furniture and fixtures	980			792
Leasehold improvements	591			539
Property and equipment	24,864			22,017
Accumulated depreciation and amortization	(13,343		)	(10,410		)
Property and equipment, net	$	11,521		$	11,607

Schedule of Capital Leased Property and Equipment

Property and equipment capitalized under capital lease obligations consist primarily of computer and network equipment and were as follows (in thousands):



	June 30, 2014			December 31, 2013
Gross	$	17,739		$	15,123
Less: accumulated depreciation and amortization	(8,158		)	(5,591		)
Total	$	9,581		$	9,532

Schedule of Accrued and Other Current Liabilities

Accrued and other current liabilities consisted of the following (in thousands):



	June 30, 2014		December 31, 2013
Accrued expenses	$	2,885	$	2,453
Accrued compensation and benefits	5,267		3,476
Accrued and other current liabilities	$	8,152	$	5,929

Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets



	June 30, 2014							December 31, 2013
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Developed technology	$	2,460	$	(248	)	$	2,212	$	2,460	$	(72	)	$	2,388
Customer relationships	520		(73		)	447		520		(21		)	499
Domain names	50		(7		)	43		50		(2		)	48
Non-compete agreements	140		(33		)	107		140		(10		)	130
Total	$	3,170	$	(361	)	$	2,809	$	3,170	$	(105	)	$	3,065

Schedule of Expected Future Amortization Expense of Intangible Assets

As of June 30, 2014, the expected future amortization expense for intangible assets was as follows (in thousands):



Period	Expected Future Amortization Expense
Remainder of 2014	$	256
2015	512
2016	503
2017	465
2018	442
2019 and beyond	631
Total	$	2,809

Short-Term and Long-Term Debt (Tables)

6 Months Ended

Jun. 30, 2014

Debt Disclosure [Abstract]

Schedule of Debt

As of June 30, 2014 and December 31, 2013, the Company’s outstanding debt is summarized as follows (in thousands):



	June 30, 2014			December 31, 2013
Notes payable	$	28,176		$	8,695
Less discount	(1,356		)	(78		)
Net carrying value of notes payable	26,820			8,617

Notes payable, current portion	2,573			1,522
Notes payable, less current portion	24,247			7,095
Revolving line of credit, current portion	12,500			—
Revolving line of credit, less current portion	—			12,500
Net carrying value of total debt	$	39,320		$	21,117
Total debt, current portion	15,073			1,522
Total debt, less current portion	24,247			19,595

Schedule of Maturities of Debt

Maturities of the Company’s outstanding debt as of June 30, 2014 are as follows (in thousands):



Period	Amount to Mature
Remainder of 2014	$	1,036
2015	15,680
2016	7,007
2017	4,620
2018	4,000
2019	8,333
Total	$	40,676

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

Stockholders' Equity (Deficit) (Tables)

6 Months Ended

Jun. 30, 2014

Equity [Abstract]

Schedule Valuation Assumptions, Warrants



	IPO Date April 3, 2014			December 31, 2013
Fair value of Series A-2 preferred stock	$	1.75	(1)	$	2.69
Fair value of Series D-2 preferred stock	$	1.75	(1)	$	2.81
Fair value of common stock	$	7.00	(1)	*
Risk-free interest rate	0.13% to 2.73%			0.33% to 2.60%
Expected life	Remaining contractual life			Remaining contractual life
Expected dividends	—			—
Volatility	40% - 50%			45.0 %

(1) Fair value of the underlying stock is based on the Company's initial public offering price of $7.00 per share calculated on a pre-reverse split basis for preferred stock and post-reverse split basis for common stock.
* There were no liability-classified common stock warrants at December 31, 2013.

Schedule of Common Stock Reserved for Future Issuance

Shares of common stock reserved for future issuance related to outstanding warrants, stock options and restricted stock units were as follows (in thousands):



		June 30, 2014
Stock options outstanding		7,145
Restricted stock units outstanding		262
Shares available for future grant under 2014 Plan		5,276
Shares available for future issuance under ESPP		880
Common stock warrants outstanding		360
Total shares of common stock reserved		13,923

Schedule of Stock Option Activities

A summary of the Company’s stock option activities during the six months ended June 30, 2014 is as follows (in thousands, except years and per share data):



	Number of Shares Outstanding		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
Outstanding as of December 31, 2013	7,633		$	3.30
Options granted (weighted average grant date fair value of $5.91 per share)	441		11.02
Options exercised	(655	)	1.10
Options forfeited or expired	(274	)	3.44
Outstanding as of June 30, 2014	7,145		$	3.97	7.17	$	28,019

Schedule of Stock-based Compensation Expense Recognized

Stock-based compensation expenses for the three and six months ended June 30, 2014 and 2013 are as follows (in thousands):



	Three Months Ended				Six Months Ended
	June 30, 2014		June 30, 2013		June 30, 2014		June 30, 2013
Cost of revenue	$	121	$	44	$	208	$	76
Research and development	471		49		821		102
Sales and marketing	368		134		694		239
General and administrative	763		77		1,196		151
Total stock-based compensation	$	1,723	$	304	$	2,919	$	568

Schedule of Weighted-Average Valuation Assumptions, Stock Option and ESPP

The weighted-average assumptions used to value stock options and purchase rights under the ESPP granted during the three and six months ended June 30, 2014 and 2013 were as follows:



Stock Options	Three Months Ended		Six Months Ended
	June 30, 2014	June 30, 2013	June 30, 2014	June 30, 2013
Expected term (years)	6.1	6.1	6.1	6.1
Volatility	56%	60%	56%	60%
Risk-free interest rate	1.9%	1.0%	1.8%	1.1%
Dividend yield	—	—	—	—



ESPP	Three Months Ended		Six Months Ended
	June 30, 2014	June 30, 2013	June 30, 2014	June 30, 2013
Expected term (years)	0.8	*	0.8	*
Volatility	39%	*	39%	*
Risk-free interest rate	0.1%	*	0.1%	*
Dividend yield	—	*	—	*

* The ESPP was effective on April 3, 2014.

Net Loss Per Share (Tables)

6 Months Ended

Jun. 30, 2014

Earnings Per Share [Abstract]

Basic and Diluted Net Loss Per Share

The following table presents the calculation of basic and diluted net loss per share (in thousands):



	Three Months Ended						Six Months Ended
	June 30, 2014			June 30, 2013			June 30, 2014			June 30, 2013
Net loss	$	(8,659	)	$	(8,290	)	$	(16,979	)	$	(14,947	)
Weighted-average shares used in computing basic and diluted net loss per share	46,898			3,684			26,367			3,610
Basic and diluted net loss per share	$	(0.18	)	$	(2.25	)	$	(0.64	)	$	(4.14	)

Schedule of Antidilutive Securities Excluded from Computation of Net Loss Per Share



	June 30, 2014	June 30, 2013
Convertible preferred stock (on an as converted post reverse stock split basis)	—	30,554
Stock options	7,145	6,049
Restricted stock units	262	—
ESPP	474	—
Common stock warrants	360	—
Convertible preferred stock warrants (on an as converted post reverse stock split basis)	—	378
Common stock subject to repurchase or forfeiture	138	—
Total	8,379	36,981

Geographical Information (Tables)

6 Months Ended

Jun. 30, 2014

Segment Reporting [Abstract]

Schedule of Revenues and Property and Equipment by Geographic Region

The following table is a summary of revenues by geographic region based on client billing address and has been estimated based on the amounts billed to clients during the periods (in thousands).



	Three Months Ended				Six Months Ended
	June 30, 2014		June 30, 2013		June 30, 2014		June 30, 2013
United States	$	22,816	$	17,884	$	45,250	$	34,426
International	1,869		2,399		3,709		4,972
Total revenue	$	24,685	$	20,283	$	48,959	$	39,398

The following table summarizes total property and equipment, net in the respective locations (in thousands).



	June 30, 2014		December 31, 2013
United States	$	10,827	$	11,079
International	694		528
Property and equipment, net	$	11,521	$	11,607

Description of Business and Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended	18 Months Ended	21 Months Ended
	Apr. 22, 2014 USD ($) shares	Apr. 03, 2014 $ / shares shares	Jun. 30, 2014 USD ($) shares	Mar. 31, 2014 USD ($)	Jun. 30, 2013 USD ($)	Mar. 31, 2014 USD ($)	Jun. 30, 2014 USD ($) shares	Apr. 09, 2014 shares	Dec. 31, 2013 shares
Initial Public Offering [Line Items]
Common Stock, shares issued \| shares			48,405,953				48,405,953		5,494,000
IPO price per share \| $ / shares		$ 7.00
Payments for offering expenses \| $					$ 306
Convertible preferred stock, conversion ratio to common stock \| shares		1
IPO [Member]
Initial Public Offering [Line Items]
Proceeds from IPO after deducting underwriters' discounts and commissions \| $	$ 74,900
Underwriters' discounts and commissions \| $	$ 5,600
Offering expenses \| $							$ 4,200
Payments for offering expenses \| $			$ 2,600	$ 800		$ 1,600
Convertible preferred stock, conversion ratio to common stock \| shares		1
Common Stock \| IPO [Member]
Initial Public Offering [Line Items]
Common Stock, shares issued \| shares								10,000,000
IPO price per share \| $ / shares		$ 7.00
Shares sold to underwriters under over allotment options \| shares	1,500,000
Reverse stock split, conversion ratio		0.25

Fair Value Measurement - Schedule of Assets and Liabilities Carried at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Liabilities
Convertible preferred stock warrant liabilities	$ 0	$ 2,647	$ 3,935	$ 2,534	$ 1,749	$ 1,979
Warrant Liability \| Convertible Preferred Stock
Liabilities
Convertible preferred stock warrant liabilities			3,935
Warrant Liability \| Convertible Preferred Stock \| Level 3
Liabilities
Convertible preferred stock warrant liabilities			3,935
U.S. Treasury bills
Short-term Investments [Abstract]
Short-term investments	29,995
U.S. Treasury bills \| Level 1
Short-term Investments [Abstract]
Short-term investments	$ 29,995
Money Market Funds
Cash equivalents:
Money market funds			738
Money Market Funds \| Level 1
Cash equivalents:
Money market funds			$ 738

Fair Value Measurement - Reconciliation of Stock Warrants Measured at Fair Value (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 03, 2014	Mar. 31, 2014	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Class of Warrant or Right, Fair Value [Roll Forward]
Balance as of beginning of period			$ 2,647	$ 1,749	$ 3,935	$ 1,979
Changes in fair value of warrants				785	(1,745)	555
Reclassified to additional paid-in capital	$ (2,600)		(2,647)		(2,647)
Balance as of end of period		$ 2,647	$ 0	2,534	0	2,534
Convertible Preferred Stock
Class of Warrant or Right, Fair Value [Roll Forward]
Changes in fair value of warrants				$ 785	(1,233)	$ 555
Series A-2 Convertible Preferred Stock
Class of Warrant or Right, Fair Value [Roll Forward]
Exercise of Series A-2 convertible preferred stock warrants					(509)
Reclassified to additional paid-in capital		$ (500)
Common Stock
Class of Warrant or Right, Fair Value [Roll Forward]
Changes in fair value of warrants					(512)
Issuance of common stock warrants in connection with debt agreement					$ 966

Cash, Cash Equivalents and Short-Term Investments - Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Cash and Cash Equivalents [Line Items]
Cash	$ 61,577	$ 17,010
Money market funds		738
Total cash and cash equivalents	$ 61,577	$ 17,748	$ 17,742	$ 5,961

Cash, Cash Equivalents and Short-Term Investments - Short-Term Investments (Details) $ in Thousands	3 Months Ended
	Jun. 30, 2014 USD ($)
Schedule of Short-Term Investments [Line Items]
Aggregate Fair Value	$ 29,995
Short-term investments remaining maturity	4 months
U.S. Treasury bills
Schedule of Short-Term Investments [Line Items]
Amortized Cost	$ 29,995
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Aggregate Fair Value	$ 29,995

Cash, Cash Equivalents and Short-Term Investments - Restricted Cash (Details) - Other Noncurrent Assets [Member] - USD ($) $ in Millions	Jun. 30, 2014	Dec. 31, 2013
Letter Of Credit Related To Lease Obligation [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 0.7	$ 0.7
Letter Of Credit Related To Insurance Policy [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 0.1	$ 0.1

Financial Statement Components - Schedule of Accounts Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts	$ (29)	$ (42)
Accounts receivable, net	7,098	6,970
Billed Revenues
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	6,761	6,430
Unbilled Revenues, net of advance client deposits
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 366	$ 582

Financial Statement Components - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Property, Plant and Equipment
Property and equipment	$ 24,864		$ 24,864		$ 22,017
Accumulated depreciation and amortization	(13,343)		(13,343)		(10,410)
Property and equipment, net	11,521		11,521		11,607
Depreciation and amortization expense	1,600	$ 900	3,000	$ 1,800
Computer and Network Equipment
Property, Plant and Equipment
Property and equipment	21,404		21,404		18,851
Computer Software
Property, Plant and Equipment
Property and equipment	1,603		1,603		1,550
Development Costs
Property, Plant and Equipment
Property and equipment	286		286		285
Furniture and Fixtures
Property, Plant and Equipment
Property and equipment	980		980		792
Leasehold Improvements
Property, Plant and Equipment
Property and equipment	$ 591		$ 591		$ 539

Financial Statement Components - Schedule of Capital Leased Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2014	Dec. 31, 2013
Financial Statement Components [Abstract]
Gross	$ 17,739	$ 15,123
Less: accumulated depreciation and amortization	(8,158)	(5,591)
Total	$ 9,581	$ 9,532

Financial Statement Components - Schedule of Accrued and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2014	Dec. 31, 2013
Financial Statement Components [Abstract]
Accrued expenses	$ 2,885	$ 2,453
Accrued compensation and benefits	5,267	3,476
Accrued and other current liabilities	$ 8,152	$ 5,929

Intangible Assets - Schedule of Acquired Finite-Lived Intangible Assets by Major Class (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	$ 3,170	$ 3,170	$ 3,170
Accumulated Amortization	(361)	(361)	(105)
Net Carrying Amount	2,809	2,809	3,065
Amortization of Intangible Assets	100	300
Developed technology
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	2,460	2,460	2,460
Accumulated Amortization	(248)	(248)	(72)
Net Carrying Amount	2,212	2,212	2,388
Customer relationships
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	520	520	520
Accumulated Amortization	(73)	(73)	(21)
Net Carrying Amount	447	447	499
Domain names
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	50	50	50
Accumulated Amortization	(7)	(7)	(2)
Net Carrying Amount	43	43	48
Non-compete agreements
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	140	140	140
Accumulated Amortization	(33)	(33)	(10)
Net Carrying Amount	$ 107	$ 107	$ 130

Intangible Assets - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) - USD ($) $ in Thousands	Jun. 30, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2014	$ 256
2015	512
2016	503
2017	465
2018	442
2019 and beyond	631
Total	$ 2,809	$ 3,065

Short-Term and Long-Term Debt - Narrative (Details)	1 Months Ended				3 Months Ended
Short-Term and Long-Term Debt - Narrative (Details)	Feb. 28, 2014 USD ($) lender $ / shares shares	Oct. 31, 2013 USD ($) $ / shares shares	Jul. 31, 2013 USD ($) installment	Mar. 31, 2013 USD ($)	Jun. 30, 2014 USD ($) $ / shares shares	Apr. 03, 2014 $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares
Debt Instrument
Promissory note, carrying value					$ 26,820,000		$ 8,617,000
Loan and Security Agreement
Debt Instrument
Covenant terms, minimum required cash on deposit at lender					5,500,000.0
Loan and Security Agreement \| Revolving Credit Facility
Debt Instrument
Credit facility, maximum borrowing capacity				$ 12,500,000
Balance outstanding allowed, description				Under the terms of the Credit Facility, the balance outstanding cannot exceed the lesser of (i) $12,500,000 or (ii) an amount equal to the Company’s monthly recurring revenue for the three months prior multiplied by the average Dollar-Based Retention Rate over the prior twelve months, less the amount accrued for the Company’s USF obligation (accrued federal fees).
Credit facility, amount borrowed					12,500,000
Loan and Security Agreement \| Revolving Credit Facility \| Prime Rate
Debt Instrument
Debt instrument, basis spread				1.25%
Loan and Security Agreement \| Term Loan
Debt Instrument
Credit facility, amount borrowed		$ 5,000,000
Discount on debt		$ 100,000
Loan and Security Agreement \| Term Loan \| Prime Rate
Debt Instrument
Debt instrument, basis spread		1.50%
2014 Loan and Security Agreement \| Term Loan
Debt Instrument
Credit facility, maximum borrowing capacity	$ 30,000,000.0
Number of lenders \| lender	2
Credit facility, remaining borrowing capacity					10,000,000
Debt, payment terms	Monthly principal payments are due beginning in February 2016 based on 1/60th of the outstanding balance at that time and will continue until all remaining principal outstanding under the term loan becomes due and payable in February 2019.
2014 Loan and Security Agreement \| Term Loan \| Prime Rate
Debt Instrument
Term loan, minimum interest rate	10.00%
2014 Loan and Security Agreement \| Term Loan \| London Interbank Offered Rate (LIBOR)
Debt Instrument
Debt instrument, basis spread	9.00%
Tranche One \| Term Loan
Debt Instrument
Credit facility, maximum borrowing capacity	$ 20,000,000
Credit facility, amount borrowed	20,000,000
Discount on debt	1,000,000
Payments of debt issuance costs	$ 400,000
Promissory Note
Debt Instrument
Promissory note, carrying value					$ 3,200,000		$ 3,700,000
Series D-2 Convertible Preferred Stock
Debt Instrument
Warrants outstanding, exercise price (in USD per share) \| $ / shares					$ 1.441
Series D-2 Convertible Preferred Stock \| Loan and Security Agreement \| Term Loan
Debt Instrument
Warrants issued \| shares		52,054
Warrants outstanding, exercise price (in USD per share) \| $ / shares		$ 1.441
Common Stock
Debt Instrument
Warrants outstanding, exercise price (in USD per share) \| $ / shares							$ 3,800.00
Warrants outstanding upon IPO \| shares					359,596	346,764	7
Common Stock \| Loan and Security Agreement \| Term Loan
Debt Instrument
Warrants outstanding, exercise price (in USD per share) \| $ / shares						$ 5.76
Warrants outstanding upon IPO \| shares						13,013
Common Stock \| 2014 Loan and Security Agreement
Debt Instrument
Warrants outstanding, exercise price (in USD per share) \| $ / shares	$ 10.12
Warrants outstanding upon IPO \| shares	177,865
Common Stock \| 2014 Loan and Security Agreement \| Term Loan
Debt Instrument
Warrants issued \| shares	177,865
Warrants outstanding, exercise price (in USD per share) \| $ / shares	$ 10.12
Class of warrant or right, vesting period (in years)	10 years
Warrants unvested, shares \| shares					59,288
Common Stock \| Tranche One \| Term Loan
Debt Instrument
Warrants vested, shares \| shares	118,577
Notes Payable
Debt Instrument
Discount on debt					$ 1,356,000		$ 78,000
Notes Payable \| Promissory Note
Debt Instrument
Promissory note issued			$ 4,100,000
Promissory note, stated interest rate			12.75%
Promissory note, number of monthly payments \| installment			42

Short-Term and Long-Term Debt - Schedule of Outstanding Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2014	Dec. 31, 2013
Schedule of ST and LT Debt [Line Items]
Notes payable	$ 40,676
Net carrying value of notes payable	26,820	$ 8,617
Notes payable, current portion	2,573	1,522
Notes payable — less current portion	24,247	7,095
Revolving line of credit, current portion	12,500
Revolving line of credit, less current portion	0	12,500
Net carrying value of total debt	39,320	21,117
Total debt, current portion	15,073	1,522
Total debt, less current portion	24,247	19,595
Notes Payable
Schedule of ST and LT Debt [Line Items]
Notes payable	28,176	8,695
Less discount	$ (1,356)	$ (78)

Short-Term and Long-Term Debt - Schedule of Maturities of Debt (Details) $ in Thousands	Jun. 30, 2014 USD ($)
Debt Disclosure [Abstract]
Remainder of 2014	$ 1,036
2015	15,680
2016	7,007
2017	4,620
2018	4,000
2019	8,333
Total	$ 40,676

Stockholders' Equity (Deficit) - Capital Structure Narrative (Details)	Apr. 03, 2014 shares	Jun. 30, 2014 $ / shares shares	Apr. 09, 2014 shares	Apr. 08, 2014 $ / shares shares	Dec. 31, 2013 $ / shares shares
Class of Stock
Convertible preferred stock, conversion ratio to common stock	1
Common Stock, shares authorized		450,000,000		450,000,000	200,000,000
Preferred Stock, shares authorized		5,000,000		5,000,000
Common Stock, par value \| $ / shares		$ 0.001		$ 0.001	$ 0.001
Preferred Stock, par value \| $ / shares		$ 0.001		$ 0.001
Common Stock, shares issued		48,405,953			5,494,000
Series A-2 Convertible Preferred Stock
Class of Stock
Shares Issued	75,643,683
Series B-2 Convertible Preferred Stock
Class of Stock
Shares Issued	18,565,794
Series C-2 Convertible Preferred Stock
Class of Stock
Shares Issued	12,903,226
Series D-2 Convertible Preferred Stock
Class of Stock
Shares Issued	15,269,294
Convertible Preferred Stock
Class of Stock
Shares Issued					122,216,000
Shares of common stock converted into	30,595,477
Preferred Stock, shares authorized					125,115,000
Preferred Stock, par value \| $ / shares					$ 0.001
IPO [Member]
Class of Stock
Convertible preferred stock, conversion ratio to common stock	1
IPO [Member] \| Common Stock
Class of Stock
Reverse stock split, conversion ratio	0.25
Common Stock, shares issued			10,000,000

Stockholders' Equity (Deficit) - Common Stock Subject to Repurchase or Forfeiture Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Oct. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Schedule of Restricted Stock [Line Items]
Stock-based compensation expense		$ 1,723	$ 304	$ 2,919	$ 568
Restricted Common Stock \| SoCoCare
Schedule of Restricted Stock [Line Items]
Restricted common stock issued in period, shares	118,577
Restricted common stock, forfeiture rights expiring one year after acquisition, percentage of award	50.00%
Restricted common stock, forfeiture rights expiring two years after acquisition, percentage of award	50.00%
Aggregate grant date fair value	$ 1,000
Restricted common stock outstanding, shares		118,577		118,577
Requisite service period	2 years
Stock-based compensation expense		$ 200		$ 400
Restricted Common Stock \| Early Exercised Stock Options
Schedule of Restricted Stock [Line Items]
Restricted common stock outstanding, shares		19,550		19,550
Liability related to early excercised stock options		$ 100		$ 100

Stockholders' Equity (Deficit) - Warrants (Details) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended	6 Months Ended	12 Months Ended
	Apr. 03, 2014 USD ($) $ / shares shares	Mar. 31, 2014 USD ($) shares	Feb. 28, 2014 $ / shares shares	Jun. 30, 2014 USD ($) $ / shares $ / warrant shares	Jun. 30, 2014 USD ($) $ / shares $ / warrant shares	Dec. 31, 2013 $ / shares shares
Class of Warrant or Right
Share Price \| $ / shares				$ 7.20	$ 7.20
Reclass of warrants liabilities to additional paid-in capital upon initial public offering \| $	$ 2,600			$ 2,647	$ 2,647
Series A-2 Convertible Preferred Stock
Class of Warrant or Right
Shares issued from warrant exercises		166,228
Shares called by outstanding warrants	1,335,041
Warrants outstanding, exercise price (in USD per share) \| $ / shares	$ 0.163
Reclass of warrants liabilities to additional paid-in capital upon initial public offering \| $		$ 500
Warrants exercised, share		175,582
Series D-2 Convertible Preferred Stock
Class of Warrant or Right
Warrant Expiration Date	October 2023
Shares called by outstanding warrants				52,054	52,054
Warrants outstanding, exercise price (in USD per share) \| $ / shares				$ 1.441	$ 1.441
Common Stock
Class of Warrant or Right
Class of Warrant or Right, Outstanding	346,764			359,596	359,596	7
Outstanding Warrants Exercise Price, Weighted-Average \| $ / shares				$ 5.59	$ 5.59
Shares issued from warrant exercises				161,979	203,536
Warrants exercised, exercise price (in USD per share) \| $ / warrant				0.652	0.652
Warrants outstanding, exercise price (in USD per share) \| $ / shares						$ 3,800.00
Warrants exercised, share				165,040
Minimum [Member] \| Series A-2 Convertible Preferred Stock
Class of Warrant or Right
Warrant Expiration Date	February 2015
Minimum [Member] \| Common Stock
Class of Warrant or Right
Warrant Expiration Date					November 2016	November 2016
Maximum [Member] \| Series A-2 Convertible Preferred Stock
Class of Warrant or Right
Warrant Expiration Date	June 2020
Maximum [Member] \| Common Stock
Class of Warrant or Right
Warrant Expiration Date					February 2024	August 2017
2014 Loan and Security Agreement \| Common Stock
Class of Warrant or Right
Class of Warrant or Right, Outstanding			177,865
Warrant Expiration Date			February 2024
Warrants outstanding, exercise price (in USD per share) \| $ / shares			$ 10.12
Class of Warrant or Right, Warrants Vested			118,577

Stockholders' Equity (Deficit) - Warrant Valuation Assumptions (Details) - $ / shares

12 Months Ended

Apr. 03, 2014

Dec. 31, 2013

Jun. 30, 2014

Class of Stock

IPO price per share

$ 7.00

Fair market value of common stock

$ 7.20

Volatility

45.00%

Warrants

Class of Stock

Expected dividends

0.00%

Warrants | Series A-2 Convertible Preferred Stock

Class of Stock

Fair market value of common stock

$ 1.75

^[1]

$ 2.69

Warrants | Series D-2 Convertible Preferred Stock

Class of Stock

Fair market value of common stock

1.75

^[1]

2.81

Warrants | Common Stock

Class of Stock

Fair market value of common stock

^[1]

$ 7.00

Minimum [Member] | Warrants

Class of Stock

Risk-free interest rate

0.13%

0.33%

Volatility

40.00%

Maximum [Member] | Warrants

Class of Stock

Risk-free interest rate

2.73%

2.60%

Volatility

50.00%

IPO [Member] | Common Stock

Class of Stock

Reverse stock split, conversion ratio

0.25

IPO price per share

$ 7.00

[1]	Fair value of the underlying stock is based on the Company's initial public offering price of $7.00 per share calculated on a pre-reverse split basis for preferred stock and post-reverse split basis for common stock.

Stockholders' Equity (Deficit) - Common Stock Reserved for Future Issuance (Details)	Jun. 30, 2014 shares
Class of Stock
Shares of common stock reserved for future issuance	13,923,000
Employee Stock Options
Class of Stock
Shares of common stock reserved for future issuance	7,145,000
Restricted Stock Units
Class of Stock
Shares of common stock reserved for future issuance	262,000
2014 Equity Incentive Plan
Class of Stock
Shares of common stock reserved for future issuance	5,276,000
Employee Stock Purchase Plan
Class of Stock
Shares of common stock reserved for future issuance	880,000
Warrants
Class of Stock
Shares of common stock reserved for future issuance	360,000

Stockholders' Equity (Deficit) - Equity Incentive Plans (Details) - shares	1 Months Ended	6 Months Ended
	Mar. 31, 2014	Jun. 30, 2014
2004 Equity Incentive Plan \| Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period		4 years
Award expiration period		10 years
Expiration period upon termination of employment		90 days
2004 Equity Incentive Plan \| Employee Stock Options \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period		12 months
Award vesting, percentage of award		25.00%
2004 Equity Incentive Plan \| Employee Stock Options \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period		36 months
Award vesting, percentage of award		75.00%
2004 Equity Incentive Plan \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares authorized for issuance	11,982,832
Number of additional shares authorized	100,000
2014 Equity Incentive Plan \| Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Award expiration period		10 years
2014 Equity Incentive Plan \| Restricted Stock Units \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period		1 year
2014 Equity Incentive Plan \| Restricted Stock Units \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period		4 years
2014 Equity Incentive Plan \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares authorized for issuance		5,300,000

Stockholders' Equity (Deficit) - Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2014 USD ($) $ / shares shares
Options Outstanding [Roll Forward]
Outstanding as of December 31, 2013 \| shares	7,633
Options granted (weighted average grant date fair value of $5.91 per share) \| shares	441
Options exercised \| shares	(655)
Options forfeited or expired \| shares	(274)
Outstanding as of June 30, 2014 \| shares	7,145
Options Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding as of December 31, 2013, weighted average exercise price (in USD per share)	$ 3.30
Options granted, weighted average exercise price (in USD per share)	11.02
Options exercised, weighted average exercise price (in USD per share)	1.10
Options forfeited or expired, weighted average exercise price (in USD per share)	3.44
Outstanding as of June 30, 2014, weighted average exercise price (in USD per share)	$ 3.97
Outstanding as of June 30, 2014, weighted average remaining contractual life	7 years 2 months 1 day
Outstanding as of June 30, 2014, aggregate intrinsic value \| $	$ 28,019
Fair market value of common stock	$ 7.20
Unrecognized compensation cost, stock options \| $	$ 10,900
Stock options
Options Outstanding [Roll Forward]
Options granted, weighted average grant date fair value	$ 5.91
Options Outstanding, Weighted Average Exercise Price [Roll Forward]
Unrecognized compensation cost, period for recognition	3 years 2 months 1 day

Stockholders' Equity (Deficit) - RSU Activity (Details) - Restricted stock units $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2014 USD ($) $ / shares shares	Jun. 30, 2014 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award
Awards granted, shares	262,438
Weighted average grant date fair value (in USD per share) \| $ / shares	$ 7.19
Awards vested in period	0
Unrecognized compensation cost \| $	$ 1.4	$ 1.4
Unrecognized compensation cost, period for recognition		1 year 7 months 13 days

Stockholders' Equity (Deficit) - ESPP (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2014	Apr. 03, 2014
Share-based Compensation Arrangement by Share-based Payment Award
IPO price per share		$ 7.00
Shares of common stock reserved for future issuance	13,923,000
ESPP
Share-based Compensation Arrangement by Share-based Payment Award
Maximum employee subscription rate, percentage of pre-tax earnings	15.00%
Maximum number of shares per employee per purchase period	1,500
Purchase price of shares, percentage of price	85.00%
Shares of common stock reserved for future issuance	880,000
Automatic annual increase in common stock reserved for issuance, percentage	1.00%
Maximum annual increase of shares reserved	1,000,000
ESPP
Share-based Compensation Arrangement by Share-based Payment Award
Unrecognized compensation cost	$ 0.8
Unrecognized compensation cost, period for recognition	10 months 15 days

Stockholders' Equity (Deficit) - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Stock-based Compensation Expense
Stock-based compensation expense	$ 1,723	$ 304	$ 2,919	$ 568
Cost of Revenue
Stock-based Compensation Expense
Stock-based compensation expense	121	44	208	76
Research and Development
Stock-based Compensation Expense
Stock-based compensation expense	471	49	821	102
Selling and Marketing
Stock-based Compensation Expense
Stock-based compensation expense	368	134	694	239
General and Administrative
Stock-based Compensation Expense
Stock-based compensation expense	$ 763	$ 77	$ 1,196	$ 151

Stockholders' Equity (Deficit) - Option & ESPP Valuation Assumptions (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Employee Stock Options
Class of Stock
Expected term (years)	6 years 1 month 6 days	6 years 1 month 6 days	6 years 1 month 6 days	6 years 1 month 6 days
Volatility	56.00%	60.00%	56.00%	60.00%
Risk-free interest rate	1.90%	1.00%	1.80%	1.10%
Dividend yield	0.00%	0.00%	0.00%	0.00%
ESPP
Class of Stock
Expected term (years)	9 months 24 days		9 months 24 days
Volatility	39.00%		39.00%
Risk-free interest rate	0.10%		0.10%
Dividend yield	0.00%		0.00%

Net Loss Per Share - Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Net loss	$ (8,659)	$ (8,290)	$ (16,979)	$ (14,947)
Weighted-average shares used in computing basic and diluted net loss per share (in shares)	46,898	3,684	26,367	3,610
Basic and diluted net loss per share (in usd per share)	$ (0.18)	$ (2.25)	$ (0.64)	$ (4.14)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Net Loss Per Share - Anidilutivve Securities Excluded from Computation of Diluted Net Loss Per Share (Details) - shares shares in Thousands	Jun. 30, 2014	Jun. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from calculation of diluted net loss per share	8,379	36,981
Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from calculation of diluted net loss per share	0	30,554
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from calculation of diluted net loss per share	7,145	6,049
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from calculation of diluted net loss per share	262	0
ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from calculation of diluted net loss per share	474	0
Warrants \| Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from calculation of diluted net loss per share	360	0
Warrants \| Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from calculation of diluted net loss per share	0	378
Common stock subject to repurchase or forfeiture
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from calculation of diluted net loss per share	138	0

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 12	$ 5	$ 39	$ 24

Commitments and Contingencies - Commitments (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2014	Jan. 31, 2014
Corporate Office Lease
Other Commitments [Line Items]
Additional commitment for modified operating lease		$ 0.6
Colocation Hosting Service Agreement
Other Commitments [Line Items]
Term of purchase obligation	36 months
Purchase Commitment	$ 0.6

Commitments and Contingencies - Contingencies (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2014 USD ($) $ / shares	Jun. 30, 2013 USD ($)	Jun. 30, 2014 USD ($) lawsuit $ / shares	Jun. 30, 2013 USD ($)	Dec. 31, 2013 USD ($)	Jul. 31, 2013 USD ($)
Universal Services Fund Liability [Abstract]
Maximum USF reimbursement payments	$ 3,100		$ 3,100
Promissory note, carrying value	26,820		26,820		$ 8,617
Accrued federal fees	4,361		4,361		4,206
Expenses related to USF obligations	1,100	$ 900	2,200	$ 1,900
State and Local Taxes and Surcharges [Abstract]
Accrued sales tax liability related to sales of subscriptions	127		127		98
Accrued sales tax liability	2,358		2,358		5,350
General and administrative expense	3,515	4,052	$ 9,686	7,877
NobelBiz, Inc. Patent Infringement Case
Legal Matters
Number of lawsuits \| lawsuit			1
Periods Prior To 2008
Universal Services Fund Liability [Abstract]
Accrued federal fees	800		$ 800		800
State and Local Taxes and Surcharges
State and Local Taxes and Surcharges [Abstract]
Payments for state and local taxes on usage-based fees	900		1,000
General and administrative expense	300	$ 500	$ 800	$ 1,000
State and Local Taxes and Surcharges \| Reversal of sales tax liability
State and Local Taxes and Surcharges [Abstract]
Reversal of sales tax liability	$ 2,800
Reversal of sales tax liability, net loss per share impact \| $ / shares	$ 0.06		$ 0.10
Promissory Note
Universal Services Fund Liability [Abstract]
Promissory note, carrying value	$ 3,200		$ 3,200		$ 3,700
Promissory Note \| Notes Payable
Universal Services Fund Liability [Abstract]
Promissory note issued						$ 4,100

Geographical Information - Schedule of Revenues and Property and Equipment by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets
Revenue	$ 24,685	$ 20,283	$ 48,959	$ 39,398
Property and equipment, net	11,521		11,521		$ 11,607
United States
Revenues from External Customers and Long-Lived Assets
Revenue	22,816	17,884	45,250	34,426
Property and equipment, net	10,827		10,827		11,079
International
Revenues from External Customers and Long-Lived Assets
Revenue	1,869	$ 2,399	3,709	$ 4,972
Property and equipment, net	$ 694		$ 694		$ 528

Subsequent Event (Details) - Capital lease $ in Millions	1 Months Ended
Subsequent Event (Details) - Capital lease $ in Millions	Jul. 31, 2014 USD ($)
Subsequent Event
Lease term	36 months
Total minimum future payment commitments	$ 1.6