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DEI - shares	3 Months Ended
DEI - shares	Mar. 31, 2014	May 05, 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	Mar. 31, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		48,241,973

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 29,238	$ 17,748
Accounts receivable, net	6,650	6,970
Prepaid expenses and other current assets	2,647	1,651
Total current assets	38,535	26,369
Property and equipment, net	11,179	11,607
Intangible assets, net	2,937	3,065
Goodwill	11,798	11,798
Other assets	4,786	3,439
Total assets	69,235	56,278
Current liabilities:
Accounts payable	3,753	4,306
Accrued and other current liabilities	7,788	5,929
Accrued federal fees	4,353	4,206
Sales tax liability	90	98
Revolving line of credit	12,500	0
Notes payable	2,037	1,522
Capital leases	4,907	4,857
Deferred revenue	4,957	4,375
Total current liabilities	40,385	25,293
Revolving line of credit — less current portion	0	12,500
Sales tax liability — less current portion	5,735	5,350
Notes payable — less current portion	24,962	7,095
Capital leases — less current portion	3,836	4,358
Convertible preferred and common stock warrant liabilities	2,647	3,935
Other long-term liabilities	668	715
Total liabilities	78,233	59,246
Commitments and contingencies (Note 9)
Stockholders’ deficit:
Convertible preferred stock, $0.001 par value; 125,115 authorized shares as of March 31, 2014 and December 31, 2013; 122,382 and 122,216 shares issued and outstanding as of March 31, 2014 and December 31, 2013, respectively	54,244	53,734
Common stock, $0.001 par value - 200,000 authorized shares as of March 31, 2014 and December 31, 2013; 6,070 and 5,494 shares issued and outstanding as of March 31, 2014 and December 31, 2013, respectively	6	5
Additional paid-in capital	35,868	34,089
Accumulated deficit	(99,116)	(90,796)
Total stockholders’ deficit	(8,998)	(2,968)
Total liabilities and stockholders’ deficit	$ 69,235	$ 56,278

Condensed Consolidated Balance Sheets - Parenthetical - $ / shares	Mar. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Preferred stock, par value per share	$ 0.001	$ 0.001
Preferred stock, shares authorized	125,115,000	125,115,000
Preferred Stock, shares issued	122,382,000	122,216,000
Preferred Stock, shares outstanding	122,382,000	122,216,000
Common Stock, par value per share	$ 0.001	$ 0.001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	6,069,530	5,494,000
Common stock, shares outstanding	6,069,530	5,494,000

Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Revenue	$ 24,274	$ 19,115
Cost of revenue	13,148	11,681
Gross profit	11,126	7,434
Operating expenses:
Research and development	5,225	4,154
Sales and marketing	9,022	6,147
General and administrative	6,171	3,825
Total operating expenses	20,418	14,126
Loss from operations	(9,292)	(6,692)
Other income (expense), net:
Change in fair value of convertible preferred and common stock warrant liabilities	1,745	230
Interest expense	(778)	(178)
Other income	32	2
Total other income (expense), net	999	54
Loss before provision for income taxes	(8,293)	(6,638)
Provision for income taxes	27	19
Net loss	$ (8,320)	$ (6,657)
Net loss per share:
Basic and diluted (in usd per share)	$ (1.48)	$ (1.88)
Shares used in computing net loss per share:
Weighted-average shares used in computing basic and diluted net loss per share (in shares)	5,608	3,536
Other comprehensive loss:
Other comprehensive loss	$ 0	$ 0
Comprehensive loss	$ (8,320)	$ (6,657)

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net loss	$ (8,320)	$ (6,657)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,592	958
Provision for doubtful accounts	20	7
Stock-based compensation	1,196	264
Loss on the disposal of property and equipment	0	4
Non-cash interest expense	51	0
Changes in fair value of convertible preferred and common stock warrant liabilities	(1,745)	(230)
Changes in operating assets and liabilities:
Accounts receivable	344	(144)
Prepaid expenses and other current assets	(965)	(1,194)
Other assets	(65)	(166)
Accounts payable	(221)	1,182
Accrued and other current liabilities	875	772
Accrued federal fees and sales tax liability	523	1,283
Deferred revenue	582	(119)
Other liabilities	(47)	197
Net cash used in operating activities	(6,180)	(3,843)
Cash flows from investing activities:
Purchases of property and equipment	(71)	(115)
Restricted cash	(25)	0
Proceeds from sale of short-term investments	0	249
Net cash provided by (used in) investing activities	(96)	134
Cash flows from financing activities:
Proceeds from exercise of common stock options	556	87
Proceeds from notes payable	19,561	0
Repayments of notes payable	(264)	(184)
Payments of capital leases	(1,282)	(664)
Payments for deferred offering costs	(805)	(15)
Proceeds from revolving line of credit	0	4,000
Net cash provided by financing activities	17,766	3,224
Net increase (decrease) in cash and cash equivalents	11,490	(485)
Cash and cash equivalents:
Beginning of period	17,748	5,961
End of period	29,238	5,476
Non-cash investing and financing activities:
Equipment obtained under capital lease	769	982
Equipment purchased and unpaid at period-end	20	17
Deferred initial public offering costs incurred but unpaid at period-end	1,787	104
Net cashless exercise of preferred stock warrants to Series A-2 convertible preferred stock	509	0
Vesting of early exercised stock options	$ 28	$ 0

Description of Business and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 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 net proceeds of $72.7 million after deducting underwriters' discounts and commissions of $5.6 million and other offering expenses payable by the Company of approximately $2.2 million. The net proceeds and other impacts of the IPO described herein are not reflected in the condensed consolidated financial statements at March 31, 2014, as the Company received the proceeds following the end of the first fiscal quarter of 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 preferred stock elected to convert to common stock on a 1:1 basis (Note 11). In this quarterly report on Form 10-Q, all information related to common stock, warrants to purchase common stock, and stock options 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 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 three months ended March 31, 2014, there have been no changes to our significant accounting policies with the exception of the accounting standards update discussed below. Recent Accounting Pronouncement In July 2013, the FASB issued a new accounting standard update 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

3 Months Ended

Mar. 31, 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):



	March 31, 2014
	Total		Level 3
Liabilities
Convertible preferred stock warrant liability (Note 6)	$	2,193	$	2,193
Common stock warrant liability (Note 6)	454		454
Total convertible preferred stock warrant and common stock warrant liabilities	$	2,647	$	2,647

	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
	March 31, 2014			March 31, 2013
Balance as of beginning of period	$	3,935		$	1,979
Changes in fair value of convertible preferred stock warrants	(1,233		)	(230		)
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		)	—
Balance as of end of period	$	2,647		$	1,749

As fully explained in Note 6, the Company has used the initial offering price of $7.00 per share in applying the valuation technique for measuring the fair value of warrant liabilities. Changes in the fair values of both the convertible preferred stock and common stock warrants have been recognized as part of 'Other income (expense), net' in the condensed consolidated statements of operations and comprehensive loss.

- 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

Financial Statement Components

3 Months Ended

Mar. 31, 2014

Financial Statement Components [Abstract]

Financial Statement Components

3. Financial Statement Components

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



	March 31, 2014		December 31, 2013
Cash	$	29,238	$	17,010
Money market funds	—		738
Cash and cash equivalents	$	29,238	$	17,748

As of March 31, 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 offices. As of March 31, 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.

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



	March 31, 2014			December 31, 2013
Trade accounts receivable	$	5,976		$	6,430
Unbilled trade accounts receivable, net of advance client deposits	695			582
Allowance for doubtful accounts	(21		)	(42		)
Accounts receivable, net	$	6,650		$	6,970

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



	March 31, 2014			December 31, 2013
Computer and network equipment	$	19,584		$	18,851
Computer software	1,555			1,550
Development costs	285			285
Furniture and fixtures	969			792
Leasehold improvements	559			539
Property and equipment	22,952			22,017
Accumulated depreciation and amortization	(11,773		)	(10,410		)
Property and equipment, net	$	11,179		$	11,607

Depreciation and amortization expense was $1.5 million and $1.0 million for the three months ended March 31, 2014 and 2013, respectively.

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



	March 31, 2014			December 31, 2013
Gross	$	15,887		$	15,123
Less: accumulated depreciation and amortization	(6,853		)	(5,591		)
Total	$	9,034		$	9,532

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



	March 31, 2014		December 31, 2013
Accrued expenses	$	3,783	$	2,453
Accrued compensation and benefits	4,005		3,476
Accrued and other current liabilities	$	7,788	$	5,929

Intangible Assets

3 Months Ended

Mar. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets Disclosure

4. Intangible Assets

The components of intangible assets, which were acquired in connection with the Company’s acquisition of Face It, Corp. in October 2013, are as follows (in thousands):



	March 31, 2014							December 31, 2013
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Developed technology	$	2,460	$	(160	)	$	2,300	$	2,460	$	(72	)	$	2,388
Customer relationships	520		(47		)	473		520		(21		)	499
Domain names	50		(5		)	45		50		(2		)	48
Non-compete agreements	140		(21		)	119		140		(10		)	130
Total	$	3,170	$	(233	)	$	2,937	$	3,170	$	(105	)	$	3,065

Amortization expense related to intangible assets was $0.1 million for the three months ended March 31, 2014. As of March 31, 2014, the expected future amortization expense for intangible assets is as follows (in thousands):



Period	Expected Future Amortization Expense
Remainder of 2014	$	384
2015	512
2016	503
2017	465
2018	442
2019 and beyond	631
Total	$	2,937

Short-Term and Long-Term Debt

3 Months Ended

Mar. 31, 2014

Debt Disclosure [Abstract]

Debt Disclosure

5. 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 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 March 31, 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 Face It, Corp. 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 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.

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 March 31, 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 two tranches; the first tranche for $20.0 million was advanced upon the closing of the agreement and the other tranche for $10.0 million is available for drawdown by the Company until February 2015. 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 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 unaudited condensed consolidated balance sheet as of March 31, 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 is 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, the warrants have been classified as a liability to the Company. 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 March 31, 2014, 59,288 shares of common stock issuable under the warrants pertaining to the undrawn tranche for $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 March 31, 2014 and December 31, 2013, approximately $3.4 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 March 31, 2014 and December 31, 2013, the Company’s outstanding debt is summarized as follows (in thousands):



	March 31, 2014			December 31, 2013
Notes payable	$	28,432		$	8,695
Less discount	(1,433		)	(78		)
Net carrying value of notes payable	26,999			8,617
Notes payable, current portion	2,037			1,522
Notes payable, less current portion	24,962			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	$	39,499		$	21,117
Total debt, current portion	14,537			1,522
Total debt, less current portion	24,962			19,595

Maturities of the Company’s outstanding debt as of March 31, 2014 are as follows (in thousands):



Period	Amount to Mature
Remainder of 2014	$	1,292
2015	15,680
2016	7,007
2017	4,620
2018	4,000
2019	8,333
Total	$	40,932

Stockholders' Deficit

3 Months Ended

Mar. 31, 2014

Equity [Abstract]

Stockholders' Deficit

6. Stockholders’ Deficit

Convertible Preferred Stock

As of March 31, 2014, the Company had outstanding Series A-2 convertible preferred stock (“Series A-2”), Series B-2 convertible preferred stock (“Series B-2”), Series C-2 convertible preferred stock (“Series C-2”) and Series D-2 convertible preferred stock (“Series D-2”).

During the three months ended March 31, 2014, the Company received a notice for the cashless exercise of warrants to purchase 175,582 shares of Series A-2 convertible preferred stock. Accordingly, the Company issued 166,228 shares of Series A-2 preferred stock. The following table summarizes the Company's convertible preferred stock authorized and issued and outstanding as of March 31, 2014 (in thousands):



Convertible Preferred Stock	Shares Authorized	Shares Issued and Outstanding	Net Proceeds		Aggregate Liquidation Preference
Series A-2	76,989	75,644	$	12,667	$	12,330
Series B-2	18,566	18,566	7,908		8,000
Series C-2	12,903	12,903	11,875		12,000
Series D-2	16,657	15,269	21,794		22,000
	125,115	122,382	$	54,244	$	54,330

Each share of preferred stock was convertible to one share of common stock. During the quarter ended March 31, 2014, the preferred stockholders elected to convert all of the outstanding preferred stock into common stock prior to the effectiveness of the Company’s registration statement filed with the SEC in connection with the IPO. On April 3, 2014, prior to the reverse stock split being effected (Note 1), all outstanding shares of preferred stock were converted to common stock on a 1:1 basis.

Common Stock

Common Stock - At March 31, 2014, there were 200,000,000 shares of common stock authorized, and 6,069,530 shares issued and outstanding. Holders of common stock are entitled to dividends, if and when declared by the board of directors.

On March 12, 2014, the Company’s board of directors approved an amended and restated certificate of incorporation (Note 11), under which the total number of shares of all classes of capital stock that the Company is authorized to issue is 455,000,000 shares including 450,000,000 shares of common stock and 5,000,000 shares of preferred stock, par value $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.

Common Stock Subject to Repurchase or Forfeiture - In connection with employment and service agreements entered into in connection with the Company’s acquisition of Face It, Corp. 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 March 31, 2014. For the three months ended March 31, 2014, $0.2 million 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 recorded as a liability. The liability is reclassified as equity as the award vests. As of March 31, 2014, a liability of $0.2 million related to 22,534 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 are included in issued and outstanding shares as of March 31, 2014.

Warrants

Series A-2 Convertible Preferred Stock Warrants — The following table summarizes activities related to the Company’s convertible preferred stock warrants during the three months ended March 31, 2014 (in thousands, except per share data):



	Number of Shares		Exercise Price		Expiration Date
Outstanding as of December 31, 2013	1,511		$	0.163
Exercised	(176	)	0.163
Outstanding as of March 31, 2014	1,335		0.163		February 2015 - 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 — As of March 31, 2014 and December 31, 2013, there was a warrant outstanding for 52,054 shares of Series D-2 convertible preferred stock with an exercise price of $1.441 that expires in October 2023.

In connection with the closing of the IPO and the 4:1 reverse stock split on April 3, 2014, all outstanding Series A-2 convertible preferred stock warrants automatically converted into warrants to purchase 333,751 (post-reverse stock split) shares of common stock at a fixed exercise price of $0.65 per share. Further, all outstanding warrants to purchase Series D-2 convertible preferred stock automatically converted into warrants to purchase 13,013 (post-reverse stock split) shares of common stock at $5.76 per share on April 3, 2014.

Common Stock Warrants - As of 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. As of March 31, 2014, these warrants were vested with respect to 118,577 shares of common stock (Note 5). The vested warrants were classified as a liability.

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 March 31, 2014 and December 31, 2013 was determined using the Black-Scholes option-pricing model with the following assumptions:



	March 31, 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.

Common Stock Reserved for Future Issuance

Shares of common stock reserved for future issuance related to outstanding convertible preferred stock, warrants and stock options, on an as converted, post-reverse stock split basis, are as follows (in thousands):



		March 31, 2014
Series A-2 convertible preferred stock (on an as converted, post-reverse split basis)		18,910
Series B-2 convertible preferred stock (on an as converted, post-reverse split basis)		4,642
Series C-2 convertible preferred stock (on an as converted, post-reverse split basis)		3,226
Series D-2 convertible preferred stock (on an as converted, post-reverse split basis)		3,817
Stock options outstanding		7,345
Shares available for future grant under 2004 Plan		117
Shares available for future grant under 2014 Plan		5,300
Shares available for future issuance under ESPP		880
Conversion of convertible preferred and common stock warrants (on an as converted, post-reverse split basis)		525
Total shares of common stock reserved		44,762

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. Under the terms of the 2004 Plan, the Company has the ability to grant incentive and nonstatutory stock options. Incentive stock options may be granted only to Company employees. Nonstatutory stock options may be granted to Company employees, directors and consultants. Such options are to be 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 10 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 board of directors voted to increase the shares of common stock reserved under the 2004 Plan by 100,000 shares. As of March 31, 2014, 116,632 shares were available for grant under 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. The 2014 Plan became effective on April 3, 2014. 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. After the IPO, the Company will grant stock options only under the 2014 Plan.

Upon the Company’s IPO, the 2004 Plan terminated. All shares reserved under the 2004 Plan became available for grant under the Company’s 2014 Equity Incentive Plan. Any forfeited shares that would otherwise return to the 2004 Plan after the IPO will instead return to the 2014 Plan.

A summary of the Company’s stock option activities during the three months ended March 31, 2014 is as follows (in thousands, except 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 $6.51 per share)	356		12.14
Options exercised	(576	)	1.14
Options forfeited or expired	(68	)	4.41
Outstanding as of March 31, 2014	7,345		$	3.89	7.62	$	28,343

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 management’s estimate of the fair value of the Company’s common stock of $7.00 as of March 31, 2014 for all in-the-money options outstanding.

Stock-based compensation expense for the three months ended March 31, 2014 and 2013 is as follows (in thousands):



	Three Months Ended
	March 31, 2014		March 31, 2013
Cost of revenue	$	87	$	32
Research and development	350		53
Sales and marketing	326		105
General and administrative	433		74
Total stock-based compensation	$	1,196	$	264

As of March 31, 2014, there was $11.7 million of total unrecognized compensation cost related to unvested stock options, which is expected to be recognized over a weighted-average period of 3.4 years.

Stock-Based Awards to Employees — All stock-based compensation for equity awards granted to employees and directors is measured at the grant date fair value of the award. 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.

The Company estimates the fair value of each option award 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 options is based on U.S. Treasury zero-coupon issues at the time of grant. The weighted-average assumptions used to value stock options granted during the three months ended March 31, 2014 and 2013 were as follows:



	Three Months Ended
	March 31, 2014	March 31, 2013
Expected term (years)	6.1	6.1
Volatility	56%	60%
Risk-free interest rate	1.8%	1.1%
Dividend yield	—	—

The Company recognizes employee stock-based compensation expense that is calculated based upon awards ultimately expected to vest and, thus, this 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.

Stock-Based Awards to Non-employees — The Company grants options to purchase shares of common stock to non-employees in conjunction with services performed. For non-employees the Company revalues the unvested portion of non-employee stock options using the Black-Scholes option-pricing model until performance is complete. As a result, the stock-based compensation will fluctuate as the fair value of the Company’s common stock fluctuates. During the three months ended March 31, 2014, the Company did not grant stock options to any non-employees. The assumptions used to value stock options granted to non-employees during the periods indicated are as follows:



	Three Months Ended
	March 31, 2014	March 31, 2013
Contractual life (in years)	*	10.0
Volatility	*	58%
Risk-free interest rate	*	2.5%
Dividend yield	*	—

* There were no stock options granted to non-employees during this period.

For the three months ended March 31, 2014 and 2013, stock-based compensation expense to non-employees was $54.0 thousand and $11.0 thousand, respectively, and is included in total stock-based compensation expense in the table above.

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.

Each offering period under the ESPP is 12 months commencing on November 16 of each year and includes two 6-month purchase periods, with purchases on May 15 and November 15.

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 first 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.

Net Loss Per Share

3 Months Ended

Mar. 31, 2014

Earnings Per Share [Abstract]

Net Loss Per Share

7. Net Loss Per Share

The Company calculates its basic and diluted net loss per common share in conformity with the two-class method required for participating securities. 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 months ended March 31, 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
	March 31, 2014			March 31, 2013
Net loss	$	(8,320	)	$	(6,657	)
Weighted-average shares used in computing basic and diluted net loss per share	5,608			3,536
Basic and diluted net loss per share	$	(1.48	)	$	(1.88	)

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):



	March 31, 2014	March 31, 2013
Convertible preferred stock (on an as converted post reverse stock split basis)	30,595	26,737
Stock options	7,345	5,917
Convertible preferred and common stock warrants (on an as converted post reverse stock split basis)	525	378
Restricted common stock	141	—
Total	38,606	33,032

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Income Tax Disclosure	8. Income Taxes The provision for income taxes for the three months ended March 31, 2014 and 2013, was approximately $27 thousand and $19 thousand, respectively. The provision for income taxes consisted primarily of foreign income taxes. For the three months ended March 31, 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 March 31, 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 months ended March 31, 2014, there have been no material changes to the total amount of unrecognized tax benefits.

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure	9. 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 have not changed materially during the three months ended March 31, 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. 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 March 31, 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 5. As of March 31, 2014, the balance of the promissory note payable was $3.4 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 March 31, 2014 and December 31, 2013, respectively, of which $0.8 million pertains to periods prior to 2008. For the three months ended March 31, 2014 and 2013, the Company incurred expenses related to its USF obligations of $1.1 million and $0.9 million, respectively, which 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 March 31, 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 $0.1 million of state and local taxes on usage-based fees during the three months ended March 31, 2014. As of March 31, 2014 and December 31, 2013, the Company accrued a sales tax liability for this contingency of $5.7 million and $5.4 million, respectively. For the three months ended March 31, 2014 and 2013, the Company recorded general and administrative expense related to its estimated sales tax liability on usage-based fees of $0.5 million and $0.5 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 recognizes general and administrative expense for legal fees in the period the services are provided. 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. The Company has investigated the claims alleged in the complaint and believes that it has good defenses to the claims, and 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. 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

3 Months Ended

Mar. 31, 2014

Segment Reporting [Abstract]

Geographical Information

10. 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 period (in thousands).



	Three Months Ended
	March 31, 2014		March 31, 2013
United States	$	22,434	$	16,538
International	1,840		2,577
Total revenue	$	24,274	$	19,115

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



	March 31, 2014		December 31, 2013
United States	$	10,655	$	11,079
International	524		528
Property and equipment, net	$	11,179	$	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

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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	11. Subsequent Events During the quarter ended March 31, 2014, the Company’s preferred stockholders elected to convert all of their outstanding preferred stock into common stock prior to the effectiveness of the Company’s registration statement filed with the SEC. On April 3, 2014, prior to the reverse stock split being effected, all outstanding preferred stock converted to common stock on a 1:1 basis. In March 2014, the Company’s board of directors authorized 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. 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 March 12, 2014, the Company’s board of directors approved an amended and restated certificate of incorporation, according to which the total number of shares of all classes of capital stock that the Company is authorized to issue is 455,000,000 shares including 450,000,000 shares of common stock and 5,000,000 shares of preferred stock, par value $0.001 per share. This amended and restated certificate of incorporation was filed with the Delaware Secretary of State, and became effective on April 8, 2014. On April 9, 2014, the Company consummated its 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. 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 net proceeds of $72.7 million after deducting underwriting discounts and commissions of $5.6 million and other offering expenses payable by the Company of approximately $2.2 million. The net proceeds and other impacts of the IPO described above are not reflected in the condensed consolidated financial statements at March 31, 2014, as the Company received the proceeds following the end of the fiscal quarter.

Description of Business and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 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.
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.
New Accounting Pronouncement	Recent Accounting Pronouncement In July 2013, the FASB issued a new accounting standard update 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)

3 Months Ended

Mar. 31, 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):



	March 31, 2014
	Total		Level 3
Liabilities
Convertible preferred stock warrant liability (Note 6)	$	2,193	$	2,193
Common stock warrant liability (Note 6)	454		454
Total convertible preferred stock warrant and common stock warrant liabilities	$	2,647	$	2,647

	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
	March 31, 2014			March 31, 2013
Balance as of beginning of period	$	3,935		$	1,979
Changes in fair value of convertible preferred stock warrants	(1,233		)	(230		)
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		)	—
Balance as of end of period	$	2,647		$	1,749

Financial Statement Components (Tables)

3 Months Ended

Mar. 31, 2014

Financial Statement Components [Abstract]

Schedule of Cash and Cash Equivalents

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



	March 31, 2014		December 31, 2013
Cash	$	29,238	$	17,010
Money market funds	—		738
Cash and cash equivalents	$	29,238	$	17,748

Schedule of Accounts Receivable

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



	March 31, 2014			December 31, 2013
Trade accounts receivable	$	5,976		$	6,430
Unbilled trade accounts receivable, net of advance client deposits	695			582
Allowance for doubtful accounts	(21		)	(42		)
Accounts receivable, net	$	6,650		$	6,970

Schedule of Property and Equipment

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



	March 31, 2014			December 31, 2013
Computer and network equipment	$	19,584		$	18,851
Computer software	1,555			1,550
Development costs	285			285
Furniture and fixtures	969			792
Leasehold improvements	559			539
Property and equipment	22,952			22,017
Accumulated depreciation and amortization	(11,773		)	(10,410		)
Property and equipment, net	$	11,179		$	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):



	March 31, 2014			December 31, 2013
Gross	$	15,887		$	15,123
Less: accumulated depreciation and amortization	(6,853		)	(5,591		)
Total	$	9,034		$	9,532

Schedule of Accrued and Other Current Liabilities

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



	March 31, 2014		December 31, 2013
Accrued expenses	$	3,783	$	2,453
Accrued compensation and benefits	4,005		3,476
Accrued and other current liabilities	$	7,788	$	5,929

Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Acquired Finite-Lived Intangible Assets by Major Class

The components of intangible assets, which were acquired in connection with the Company’s acquisition of Face It, Corp. in October 2013, are as follows (in thousands):



	March 31, 2014							December 31, 2013
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Developed technology	$	2,460	$	(160	)	$	2,300	$	2,460	$	(72	)	$	2,388
Customer relationships	520		(47		)	473		520		(21		)	499
Domain names	50		(5		)	45		50		(2		)	48
Non-compete agreements	140		(21		)	119		140		(10		)	130
Total	$	3,170	$	(233	)	$	2,937	$	3,170	$	(105	)	$	3,065

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

As of March 31, 2014, the expected future amortization expense for intangible assets is as follows (in thousands):



Period	Expected Future Amortization Expense
Remainder of 2014	$	384
2015	512
2016	503
2017	465
2018	442
2019 and beyond	631
Total	$	2,937

Short-Term and Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2014

Debt Disclosure [Abstract]

Schedule of Debt Instruments

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



	March 31, 2014			December 31, 2013
Notes payable	$	28,432		$	8,695
Less discount	(1,433		)	(78		)
Net carrying value of notes payable	26,999			8,617
Notes payable, current portion	2,037			1,522
Notes payable, less current portion	24,962			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	$	39,499		$	21,117
Total debt, current portion	14,537			1,522
Total debt, less current portion	24,962			19,595

Schedule of Maturities of Debt

Maturities of the Company’s outstanding debt as of March 31, 2014 are as follows (in thousands):



Period	Amount to Mature
Remainder of 2014	$	1,292
2015	15,680
2016	7,007
2017	4,620
2018	4,000
2019	8,333
Total	$	40,932

- 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
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
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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' Deficit (Tables)

3 Months Ended

Mar. 31, 2014

Equity [Abstract]

Summary of Convertible Preferred Stock Authorized and Issued and Outstanding

The following table summarizes the Company's convertible preferred stock authorized and issued and outstanding as of March 31, 2014 (in thousands):



Convertible Preferred Stock	Shares Authorized	Shares Issued and Outstanding	Net Proceeds		Aggregate Liquidation Preference
Series A-2	76,989	75,644	$	12,667	$	12,330
Series B-2	18,566	18,566	7,908		8,000
Series C-2	12,903	12,903	11,875		12,000
Series D-2	16,657	15,269	21,794		22,000
	125,115	122,382	$	54,244	$	54,330

Activity in Convertible Preferred Stock Warrants

The following table summarizes activities related to the Company’s convertible preferred stock warrants during the three months ended March 31, 2014 (in thousands, except per share data):



	Number of Shares		Exercise Price		Expiration Date
Outstanding as of December 31, 2013	1,511		$	0.163
Exercised	(176	)	0.163
Outstanding as of March 31, 2014	1,335		0.163		February 2015 - June 2020

Schedule of Warrants, Valuation Assumptions



	March 31, 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.

Summary of Common Stock Reserved for Future Issuance



		March 31, 2014
Series A-2 convertible preferred stock (on an as converted, post-reverse split basis)		18,910
Series B-2 convertible preferred stock (on an as converted, post-reverse split basis)		4,642
Series C-2 convertible preferred stock (on an as converted, post-reverse split basis)		3,226
Series D-2 convertible preferred stock (on an as converted, post-reverse split basis)		3,817
Stock options outstanding		7,345
Shares available for future grant under 2004 Plan		117
Shares available for future grant under 2014 Plan		5,300
Shares available for future issuance under ESPP		880
Conversion of convertible preferred and common stock warrants (on an as converted, post-reverse split basis)		525
Total shares of common stock reserved		44,762

Summary of Stock Option Activities

A summary of the Company’s stock option activities during the three months ended March 31, 2014 is as follows (in thousands, except 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 $6.51 per share)	356		12.14
Options exercised	(576	)	1.14
Options forfeited or expired	(68	)	4.41
Outstanding as of March 31, 2014	7,345		$	3.89	7.62	$	28,343

Schedule of Stock-based Compensation Expense Recognized

Stock-based compensation expense for the three months ended March 31, 2014 and 2013 is as follows (in thousands):



	Three Months Ended
	March 31, 2014		March 31, 2013
Cost of revenue	$	87	$	32
Research and development	350		53
Sales and marketing	326		105
General and administrative	433		74
Total stock-based compensation	$	1,196	$	264

Schedule of Employee Stock Options, Valuation Assumptions

The weighted-average assumptions used to value stock options granted during the three months ended March 31, 2014 and 2013 were as follows:



	Three Months Ended
	March 31, 2014	March 31, 2013
Expected term (years)	6.1	6.1
Volatility	56%	60%
Risk-free interest rate	1.8%	1.1%
Dividend yield	—	—

Schedule of Non-employee Stock Options, Valuation Assumptions

The assumptions used to value stock options granted to non-employees during the periods indicated are as follows:



	Three Months Ended
	March 31, 2014	March 31, 2013
Contractual life (in years)	*	10.0
Volatility	*	58%
Risk-free interest rate	*	2.5%
Dividend yield	*	—

* There were no stock options granted to non-employees during this period.

- Definition

Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

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-Name Accounting Standards Codification
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-Publisher SEC
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-Number 210
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-Article 5

Reference 14: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
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+ Details

- Definition

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

+ References + Details

Net Loss Per Share (Tables)

3 Months Ended

Mar. 31, 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
	March 31, 2014			March 31, 2013
Net loss	$	(8,320	)	$	(6,657	)
Weighted-average shares used in computing basic and diluted net loss per share	5,608			3,536
Basic and diluted net loss per share	$	(1.48	)	$	(1.88	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share



	March 31, 2014	March 31, 2013
Convertible preferred stock (on an as converted post reverse stock split basis)	30,595	26,737
Stock options	7,345	5,917
Convertible preferred and common stock warrants (on an as converted post reverse stock split basis)	525	378
Restricted common stock	141	—
Total	38,606	33,032

Geographical Information (Tables)

3 Months Ended

Mar. 31, 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 period (in thousands).



	Three Months Ended
	March 31, 2014		March 31, 2013
United States	$	22,434	$	16,538
International	1,840		2,577
Total revenue	$	24,274	$	19,115

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



	March 31, 2014		December 31, 2013
United States	$	10,655	$	11,079
International	524		528
Property and equipment, net	$	11,179	$	11,607

Description of Business and Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Millions	Apr. 22, 2014 USD ($) $ / shares shares	Apr. 03, 2014	Apr. 09, 2014 $ / shares shares	Mar. 31, 2014 shares	Dec. 31, 2013 shares
Initial Public Offering [Line Items]
Shares of common stock issued \| shares				6,069,530	5,494,000
IPO
Initial Public Offering [Line Items]
IPO price per share \| $ / shares			$ 7.00
Reverse stock split, conversion ratio		0.25
Convertible preferred stock, conversion ratio to common stock		1
Common Stock \| IPO
Initial Public Offering [Line Items]
Shares of common stock issued \| shares			10,000,000
IPO price per share \| $ / shares	$ 7.00		$ 7.00
Shares sold to underwriters under over allotment options \| shares	1,500,000
Net proceeds from IPO \| $	$ 72.7
Underwriters' discounts and commissions \| $	5.6
Other offering expenses payable \| $	$ 2.2

Fair Value Measurement - Schedule of Assets and Liabilities Carried at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Liabilities
Convertible preferred and common stock warrant liabilities	$ 2,647	$ 3,935	$ 1,749	$ 1,979
Money Market Funds
Cash equivalents:
Money market funds		738
Money Market Funds \| Level 1
Cash equivalents:
Money market funds		738
Money Market Funds \| Level 3
Cash equivalents:
Money market funds		0
Warrant Liability
Liabilities
Convertible preferred and common stock warrant liabilities	2,647
Warrant Liability \| Convertible Preferred Stock
Liabilities
Convertible preferred and common stock warrant liabilities	2,193	3,935
Warrant Liability \| Common Stock
Liabilities
Convertible preferred and common stock warrant liabilities	454
Warrant Liability \| Level 1 \| Convertible Preferred Stock
Liabilities
Convertible preferred and common stock warrant liabilities		0
Warrant Liability \| Level 3
Liabilities
Convertible preferred and common stock warrant liabilities	2,647
Warrant Liability \| Level 3 \| Convertible Preferred Stock
Liabilities
Convertible preferred and common stock warrant liabilities	2,193	$ 3,935
Warrant Liability \| Level 3 \| Common Stock
Liabilities
Convertible preferred and common stock warrant liabilities	$ 454

Fair Value Measurement - Reconciliation of Stock Warrants Measured at Fair Value (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2014 USD ($) $ / shares	Mar. 31, 2013 USD ($)
Class of Warrant or Right, Fair Value [Roll Forward]
Balance as of beginning of period	$ 3,935	$ 1,979
Changes in fair value of warrants	(1,745)	(230)
Balance as of end of period	$ 2,647	1,749
Estimated fair value of common stock shares \| $ / shares	$ 7.00
Convertible Preferred Stock
Class of Warrant or Right, Fair Value [Roll Forward]
Changes in fair value of warrants	$ (1,233)	(230)
Series A-2 Preferred Stock
Class of Warrant or Right, Fair Value [Roll Forward]
Exercise of Series A-2 convertible preferred stock warrants	(509)	0
Common Stock
Class of Warrant or Right, Fair Value [Roll Forward]
Changes in fair value of warrants	(512)	0
Issuance of common stock warrants in connection with debt agreement	$ 966	$ 0

Financial Statement Components - Schedule of Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Cash and Cash Equivalents
Cash	$ 29,238	$ 17,010
Money market funds	0	738
Cash and cash equivalents	29,238	17,748	$ 5,476	$ 5,961
Other Assets \| Letter Of Credit Related To Lease Obligation
Cash and Cash Equivalents
Restricted cash	700	700
Other Assets \| Letter Of Credit Related To Insurance Policy
Cash and Cash Equivalents
Restricted cash	$ 100	$ 100

Financial Statement Components - Schedule of Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable
Allowance for doubtful accounts	$ (21)	$ (42)
Accounts receivable, net	6,650	6,970
Billed Revenues
Accounts, Notes, Loans and Financing Receivable
Trade accounts receivable	5,976	6,430
Unbilled Revenues
Accounts, Notes, Loans and Financing Receivable
Trade accounts receivable	$ 695	$ 582

Financial Statement Components - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Property, Plant and Equipment
Property and equipment	$ 22,952		$ 22,017
Accumulated depreciation and amortization	(11,773)		(10,410)
Property and equipment, net	11,179		11,607
Depreciation and amortization expense	1,500	$ 1,000
Computer and Network Equipment
Property, Plant and Equipment
Property and equipment	19,584		18,851
Computer Software
Property, Plant and Equipment
Property and equipment	1,555		1,550
Development Costs
Property, Plant and Equipment
Property and equipment	285		285
Furniture and Fixtures
Property, Plant and Equipment
Property and equipment	969		792
Leasehold Improvements
Property, Plant and Equipment
Property and equipment	$ 559		$ 539

Financial Statement Components - Schedule of Capital Leased Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2014	Dec. 31, 2013
Financial Statement Components [Abstract]
Gross	$ 15,887	$ 15,123
Less: accumulated depreciation and amortization	(6,853)	(5,591)
Total	$ 9,034	$ 9,532

Financial Statement Components - Schedule of Accrued and Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2014	Dec. 31, 2013
Financial Statement Components [Abstract]
Accrued expenses	$ 3,783	$ 2,453
Accrued compensation and benefits	4,005	3,476
Accrued and other current liabilities	$ 7,788	$ 5,929

Intangible Assets - Schedule of Acquired Finite-Lived Intangible Assets by Major Class (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	$ 3,170	$ 3,170
Accumulated Amortization	(233)	(105)
Net Carrying Amount	2,937	3,065
Amortization of Intangible Assets	100
Developed technology
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	2,460	2,460
Accumulated Amortization	(160)	(72)
Net Carrying Amount	2,300	2,388
Customer relationships
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	520	520
Accumulated Amortization	(47)	(21)
Net Carrying Amount	473	499
Domain names
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	50	50
Accumulated Amortization	(5)	(2)
Net Carrying Amount	45	48
Non-compete agreements
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	140	140
Accumulated Amortization	(21)	(10)
Net Carrying Amount	$ 119	$ 130

Intangible Assets - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) - USD ($) $ in Thousands	Mar. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2014	$ 384
2015	512
2016	503
2017	465
2018	442
2019 and beyond	631
Total	$ 2,937	$ 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 $ / warrant shares	Jul. 31, 2013 USD ($) installment	Mar. 31, 2013 USD ($)	Mar. 31, 2014 USD ($) tranche $ / warrant shares	Mar. 31, 2013 USD ($)	Dec. 31, 2013 USD ($) $ / warrant shares	Oct. 31, 2013 USD ($)
Debt Instrument
Class of warrant or right, vesting period (in years)				10 years
Promissory note, carrying value				$ 26,999,000		$ 8,617,000
Term Loan
Debt Instrument
Number of lenders \| lender	2
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
Debt instrument, maximum borrowing capacity			$ 12,500,000		$ 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 outstanding				$ 12,500,000.0
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 outstanding							$ 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
Debt instrument, maximum borrowing capacity	$ 30,000,000.0
Credit facility, number of tranches \| tranche				2
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
Debt instrument, maximum borrowing capacity	$ 20,000,000
Credit facility, amount outstanding	20,000,000
Discount on debt	1,000,000
Payments of debt issuance costs	400,000
Tranche Two \| Term Loan
Debt Instrument
Debt instrument, maximum borrowing capacity	$ 10,000,000
Promissory Note
Debt Instrument
Promissory note, carrying value				$ 3,400,000		$ 3,700,000
Series D-2 Convertible Preferred Stock
Debt Instrument
Warrants issued \| shares				52,054
Exercise price of warrant (in USD per share) \| $ / warrant				1.441
Series D-2 Convertible Preferred Stock \| Loan and Security Agreement
Debt Instrument
Warrants issued \| shares						52,054
Exercise price of warrant (in USD per share) \| $ / warrant						1.441
Series D-2 Convertible Preferred Stock \| Loan and Security Agreement \| Term Loan
Debt Instrument
Warrants issued \| shares				52,054
Exercise price of warrant (in USD per share) \| $ / warrant				1.441
Common Stock
Debt Instrument
Exercise price of warrant (in USD per share) \| $ / warrant						3,800.00
Common Stock \| 2014 Loan and Security Agreement
Debt Instrument
Exercise price of warrant (in USD per share) \| $ / warrant	10.12
Common Stock \| 2014 Loan and Security Agreement \| Term Loan
Debt Instrument
Warrants issued \| shares				177,865
Exercise price of warrant (in USD per share) \| $ / warrant				10.12
Common Stock \| Tranche One \| Term Loan
Debt Instrument
Warrants vested in period, shares \| shares	118,577
Common Stock \| Tranche Two \| Term Loan
Debt Instrument
Warrants unvested, shares \| shares				59,288
Notes Payable
Debt Instrument
Discount on debt				$ 1,433,000		$ 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	Mar. 31, 2014	Dec. 31, 2013
Schedule of ST and LT Debt [Line Items]
Notes payable	$ 40,932
Net carrying value of notes payable	26,999	$ 8,617
Notes payable, current portion	2,037	1,522
Notes payable — less current portion	24,962	7,095
Revolving line of credit, current portion	12,500	0
Revolving line of credit, less current portion	0	12,500
Net carrying value of total debt	39,499	21,117
Total debt, current portion	14,537	1,522
Total debt, less current portion	24,962	19,595
Notes Payable
Schedule of ST and LT Debt [Line Items]
Notes payable	28,432	8,695
Less discount	$ (1,433)	$ (78)

Short-Term and Long-Term Debt - Schedule of Maturities of Debt (Details) $ in Thousands	Mar. 31, 2014 USD ($)
Debt Disclosure [Abstract]
Remainder of 2014	$ 1,292
2015	15,680
2016	7,007
2017	4,620
2018	4,000
2019	8,333
Total	$ 40,932

Stockholders' Deficit - Convertible Preferred Stock Narrative (Details) $ in Thousands		3 Months Ended
	Apr. 03, 2014	Mar. 31, 2014 USD ($) shares	Feb. 28, 2014 shares	Dec. 31, 2013 USD ($) shares
Class of Warrant or Right
Shares Authorized		125,115,000		125,115,000
Shares Issued		122,382,000		122,216,000
Shares Outstanding		122,382,000		122,216,000
Net Proceeds \| $		$ 54,244		$ 53,734
Aggregate Liquidation Preference \| $		$ 54,330
Series A-2 Preferred Stock
Class of Warrant or Right
Warrants exercised, share		175,582
Shares issued upon exercise of warrants		166,228
Shares Authorized		76,989,000
Shares Issued		75,644,000
Shares Outstanding		75,644,000
Net Proceeds \| $		$ 12,667
Aggregate Liquidation Preference \| $		$ 12,330
Series B-2
Class of Warrant or Right
Shares Authorized		18,566,000
Shares Issued		18,566,000
Shares Outstanding		18,566,000
Net Proceeds \| $		$ 7,908
Aggregate Liquidation Preference \| $		$ 8,000
Series C-2
Class of Warrant or Right
Shares Authorized		12,903,000
Shares Issued		12,903,000
Shares Outstanding		12,903,000
Net Proceeds \| $		$ 11,875
Aggregate Liquidation Preference \| $		$ 12,000
Series D Preferred Stock
Class of Warrant or Right
Shares Authorized		16,657,000
Shares Issued		15,269,000
Shares Outstanding		15,269,000
Net Proceeds \| $		$ 21,794
Aggregate Liquidation Preference \| $		$ 22,000
Common Stock
Class of Warrant or Right
Convertible preferred stock, shares issued upon conversion			1
IPO
Class of Warrant or Right
Convertible preferred stock, conversion ratio to common stock	1

Stockholders' Deficit - Common Stock Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	Oct. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Apr. 07, 2014	Dec. 31, 2013
Class of Stock
Common stock, shares authorized		200,000,000			200,000,000
Common stock, shares issued		6,069,530			5,494,000
Common stock, shares outstanding		6,069,530			5,494,000
Preferred stock, shares authorized		125,115,000			125,115,000
Preferred stock, par value per share		$ 0.001			$ 0.001
Stock-based compensation expense		$ 1,196	$ 264
Early Exercised Stock Options \| Accrued and Other Current Liabilities
Class of Stock
Restricted common stock outstanding, shares		22,534
Employee deposits of exercise price		$ 200
Face It, Corp. \| Restricted Common Stock
Class of Stock
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
Requisite service period	2 years
Stock-based compensation expense		$ 200
Amended and restated certification of incorporation
Class of Stock
Common stock, shares authorized				450,000,000
Common and preferred stock, shares authorized				455,000,000
Preferred stock, shares authorized				5,000,000
Preferred stock, par value per share				$ 0.001
Series D Preferred Stock
Class of Stock
Preferred stock, shares authorized		16,657,000
Series A-2 Preferred Stock
Class of Stock
Preferred stock, shares authorized		76,989,000

Stockholders' Deficit - Warrants (Details) $ in Thousands		1 Months Ended		3 Months Ended
Stockholders' Deficit - Warrants (Details) $ in Thousands	Apr. 03, 2014 $ / warrant	Mar. 31, 2014 USD ($) $ / warrant shares	Feb. 28, 2014 $ / warrant shares	Mar. 31, 2014 USD ($) $ / warrant shares	Mar. 31, 2013 USD ($)	Apr. 03, 2014 $ / warrant shares	Mar. 31, 2014 $ / warrant shares	Dec. 31, 2013 $ / warrant shares
Series A-2 Preferred Stock
Class of Warrant or Right
Warrants exercised, share \| shares				175,582
Warrants exercised, fair value \| $				$ 509	$ 0
Exercise price of warrant (in USD per share)		0.163		0.163			0.163	0.163
Class of Warrant or Right, Warrants Outstanding [Roll Forward]
Outstanding as of December 31, 2013 \| shares				1,511,000
Exercised \| shares				(175,582)
Outstanding as of March 31, 2014 \| shares		1,335,000		1,335,000
Class of Warrant or Right, Exercise Price [Roll Forward]
Outstanding as of December 31, 2013, exercise price (in usd per share)				0.163
Exercised, exercise price (in USD per share)				0.163
Outstanding as of March 31, 2014, exercise price (in usd per share)		0.163		0.163
Series A-2 Preferred Stock \| Additional Paid-in Capital
Class of Warrant or Right
Warrants exercised, fair value \| $		$ 500
Series D-2 Convertible Preferred Stock
Class of Warrant or Right
Warrants outstanding \| shares							52,054
Exercise price of warrant (in USD per share)		1.441		1.441			1.441
Class of Warrant or Right, Exercise Price [Roll Forward]
Outstanding as of March 31, 2014, exercise price (in usd per share)		1.441		1.441
Series D-2 Convertible Preferred Stock \| Loan and Security Agreement
Class of Warrant or Right
Warrants outstanding \| shares								52,054
Exercise price of warrant (in USD per share)				1.441				1.441
Class of Warrant or Right, Exercise Price [Roll Forward]
Outstanding as of December 31, 2013, exercise price (in usd per share)				1.441
Common Stock
Class of Warrant or Right
Exercise price of warrant (in USD per share)				3,800.00				3,800.00
Class of Warrant or Right, Warrants Outstanding [Roll Forward]
Outstanding as of March 31, 2014 \| shares		7		7
Class of Warrant or Right, Exercise Price [Roll Forward]
Outstanding as of December 31, 2013, exercise price (in usd per share)				3,800.00
Common Stock \| 2014 Loan and Security Agreement
Class of Warrant or Right
Exercise price of warrant (in USD per share)		10.12	10.12
Class of Warrant or Right, Warrants Vested \| shares			118,577
Class of Warrant or Right, Warrants Outstanding [Roll Forward]
Outstanding as of December 31, 2013 \| shares		177,865
Outstanding as of March 31, 2014 \| shares			177,865
Class of Warrant or Right, Exercise Price [Roll Forward]
Outstanding as of December 31, 2013, exercise price (in usd per share)		10.12
Outstanding as of March 31, 2014, exercise price (in usd per share)			10.12
IPO
Class of Warrant or Right
Reverse stock split, conversion ratio	0.25
IPO \| Series A-2 Preferred Stock
Class of Warrant or Right
Exercise price of warrant (in USD per share)	0.65					0.65
Number of shares which are called by warrants \| shares						333,751
Class of Warrant or Right, Exercise Price [Roll Forward]
Outstanding as of March 31, 2014, exercise price (in usd per share)	0.65
IPO \| Series D-2 Convertible Preferred Stock
Class of Warrant or Right
Exercise price of warrant (in USD per share)	5.76					5.76
Number of shares which are called by warrants \| shares						13,013
Class of Warrant or Right, Exercise Price [Roll Forward]
Outstanding as of March 31, 2014, exercise price (in usd per share)	5.76

Stockholders' Deficit - Common Stock Reserved for Future Issuance (Details)	Mar. 31, 2014 shares
Class of Stock
Shares of common stock reserved for future issuance	44,762,000
Series A-2 Preferred Stock
Class of Stock
Shares of common stock reserved for future issuance	18,910,000
Series B-2 Convertible Preferred Stock
Class of Stock
Shares of common stock reserved for future issuance	4,642,000
Series C-2 Convertible Preferred Stock
Class of Stock
Shares of common stock reserved for future issuance	3,226,000
Series D-2 Convertible Preferred Stock
Class of Stock
Shares of common stock reserved for future issuance	3,817,000
Preferred and Common Stock Warrants
Class of Stock
Shares of common stock reserved for future issuance	525,000
Employee Stock Options
Class of Stock
Shares of common stock reserved for future issuance	7,345,000
2004 Equity Incentive Plan
Class of Stock
Shares of common stock reserved for future issuance	117,000
2014 Equity Incentive Plan
Class of Stock
Shares of common stock reserved for future issuance	5,300,000
Employee Stock Purchase Plan
Class of Stock
Shares of common stock reserved for future issuance	880,000

Stockholders' Deficit - Equity Incentive Plans (Details)	1 Months Ended	3 Months Ended
	Mar. 31, 2014 shares	Mar. 31, 2014 shares
2004 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares available for grant	116,632	116,632
Employee and Nonemployee Stock Options \| 2004 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Award expiration period		10 years
Expiration period of vested award after termination of employment or relationship as consultant or director		90 days
Employee Stock Options \| 2004 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares authorized for issuance	11,982,832	11,982,832
Award vesting period		4 years
Common Stock \| 2004 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of additional shares authorized	100,000
Common Stock \| 2014 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares authorized for issuance	5,300,000	5,300,000
Tranche One \| Employee Stock Options \| 2004 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period		12 months
Award vesting, percentage of award		25.00%
Tranche Two \| Employee Stock Options \| 2004 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period		36 months
Award vesting, percentage of award		75.00%

Stockholders' Deficit - Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 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 $6.51 per share) \| shares	356
Options exercised \| shares	(576)
Options forfeited or expired \| shares	(68)
Outstanding as of March 31, 2014 \| shares	7,345
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 grant date fair value of $6.51 per share), weighted average exercise price (in USD per share)	12.14
Options exercised, weighted average exercise price (in USD per share)	1.14
Options forfeited or expired, weighted average exercise price (in USD per share)	$ 4.41
Outstanding as of December 31, 2013, weighted average remaining contractual life	7 years 7 months 13 days
Outstanding as of December 31, 2013, aggregate intrinsic value \| $	$ 28,343
Estimated fair value of common stock shares	$ 7.00
Stock options
Options Outstanding [Roll Forward]
Options granted, weighted average grant date fair value	$ 6.51

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

3 Months Ended

12 Months Ended

Mar. 31, 2014

Mar. 31, 2013

Dec. 31, 2013

Apr. 09, 2014

Class of Stock

Fair value of stock underlying warrants

$ 7.00

Volatility

45.00%

Options granted (weighted average grant date fair value of $6.51 per share)

356,000

IPO

Class of Stock

IPO price per share

$ 7.00

Employee Stock Options

Class of Stock

Expected term (years)

6 years 1 month 6 days

Volatility

56.00%

60.00%

Risk-free interest rate

1.80%

1.10%

Dividend yield

0.00%

Non-employee Stock Options [Member]

Class of Stock

Contractual life (in years)

^[1]

10 years

Volatility

^[1]

58.00%

Risk-free interest rate

^[1]

2.50%

Expected dividends

^[1]

0.00%

Options granted (weighted average grant date fair value of $6.51 per share)

Preferred and Common Stock Warrants

Class of Stock

Expected dividends

0.00%

Preferred and Common Stock Warrants | Minimum [Member]

Class of Stock

Volatility

40.00%

Risk-free interest rate

0.13%

0.33%

Preferred and Common Stock Warrants | Maximum [Member]

Class of Stock

Volatility

50.00%

Risk-free interest rate

2.73%

2.60%

Preferred and Common Stock Warrants | Series A-2 Preferred Stock

Class of Stock

Fair value of stock underlying warrants

$ 1.75

^[2]

$ 2.69

Preferred and Common Stock Warrants | Series D-2 Convertible Preferred Stock

Class of Stock

Fair value of stock underlying warrants

1.75

^[2]

2.81

Preferred and Common Stock Warrants | Common Stock

Class of Stock

Fair value of stock underlying warrants

^[2]

$ 7.00

[1]	There were no stock options granted to non-employees during this period.
[2]	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' Deficit - Stock-based Compensation Expense (Details) - USD ($)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Stock-based Compensation Expense
Stock-based compensation expense	$ 1,196,000	$ 264,000
Unrecognized compensation cost related to unvested stock options	11,700,000
Cost of Revenue
Stock-based Compensation Expense
Stock-based compensation expense	87,000	32,000
Research and Development
Stock-based Compensation Expense
Stock-based compensation expense	350,000	53,000
Selling and Marketing
Stock-based Compensation Expense
Stock-based compensation expense	326,000	105,000
General and Administrative
Stock-based Compensation Expense
Stock-based compensation expense	$ 433,000	74,000
Employee Stock Options
Stock-based Compensation Expense
Unrecognized compensation cost, period for recognition	3 years 4 months 24 days
Non-employee Stock Options [Member]
Stock-based Compensation Expense
Stock-based compensation expense	$ 54,000	$ 11,000

Stockholders' Deficit - ESPP (Details) - $ / shares	3 Months Ended
Stockholders' Deficit - ESPP (Details) - $ / shares	Mar. 31, 2014	Apr. 09, 2014
Share-based Compensation Arrangement by Share-based Payment Award
Shares of common stock reserved for future issuance	44,762,000
Employee Stock Purchase Plan
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
IPO
Share-based Compensation Arrangement by Share-based Payment Award
IPO price per share		$ 7.00

Net Loss Per Share - Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Net loss	$ (8,320)	$ (6,657)
Weighted-average shares used in computing basic and diluted net loss per share (in shares)	5,608	3,536
Basic and diluted net loss per share (in usd per share)	$ (1.48)	$ (1.88)

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.18)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.22)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e565-108580

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 19
-Article 5

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

+ Details

Net Loss Per Share - Schedule of Anidilutivve Securities Excluded from Computation of Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from calculation of diluted net loss per share	38,606	33,032
Convertible preferred stock (on an as converted post reverse stock split basis)
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from calculation of diluted net loss per share	30,595	26,737
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from calculation of diluted net loss per share	7,345	5,917
Convertible preferred and common stock warrants (on an as converted post reverse stock split basis)
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from calculation of diluted net loss per share	525	378
Restricted common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from calculation of diluted net loss per share	141	0

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 27	$ 19

Commitments and Contingencies - Commitments (Details) $ in Millions	Jan. 31, 2014 USD ($)
Corporate Office Lease
Operating Leased Assets
Additional commitment for modified operating lease	$ 0.6

Commitments and Contingencies - Contingencies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2014 USD ($) lawsuit	Mar. 31, 2013 USD ($)	Dec. 31, 2013 USD ($)	Jul. 31, 2013 USD ($)
Loss Contingencies
Maximum USF Reimbursement Payments	$ 3,100
Promissory note, carrying value	26,999		$ 8,617
Accrued federal fees	4,353		4,206
Expenses Related To USF Obligations	1,100	$ 900
Sales tax liability			100
General and administrative expense	6,171	3,825
Periods Prior To 2008
Loss Contingencies
Accrued federal fees	800		800
Potential Obligation to Collect Sales Taxes on Sales Subscriptions
Loss Contingencies
Sales tax liability	100
Payments for state and local taxes on usage-based fees	100
Accrued sales tax	5,700		5,400
General and administrative expense	$ 500	$ 500
NobelBiz, Inc. Patent Infringement Case
Loss Contingencies
Number of lawsuits \| lawsuit	1
Promissory Note
Loss Contingencies
Promissory note, carrying value	$ 3,400		$ 3,700
Promissory Note \| Notes Payable
Loss Contingencies
Promissory note issued				$ 4,100

Geographical Information - Schedule of Revenues and Property and Equipment by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets
Revenue	$ 24,274	$ 19,115
Property and equipment, net	11,179		$ 11,607
United States
Revenues from External Customers and Long-Lived Assets
Revenue	22,434	16,538
Property and equipment, net	10,655		11,079
International
Revenues from External Customers and Long-Lived Assets
Revenue	1,840	$ 2,577
Property and equipment, net	$ 524		$ 528

Subsequent Events (Details) $ / shares in Units, $ in Millions	Apr. 22, 2014 USD ($) $ / shares shares	Apr. 03, 2014	Apr. 09, 2014 $ / shares shares	Apr. 08, 2014 shares	Apr. 07, 2014 $ / shares shares	Mar. 31, 2014 $ / shares shares	Dec. 31, 2013 $ / shares shares
Subsequent Event
Common stock, shares authorized						200,000,000	200,000,000
Preferred stock, shares authorized						125,115,000	125,115,000
Preferred stock, par value per share \| $ / shares						$ 0.001	$ 0.001
Shares of common stock issued						6,069,530	5,494,000
Amended and restated certification of incorporation
Subsequent Event
Common and preferred stock, shares authorized					455,000,000
Common stock, shares authorized					450,000,000
Preferred stock, shares authorized					5,000,000
Preferred stock, par value per share \| $ / shares					$ 0.001
Amended and restated certification of incorporation \| Common Stock
Subsequent Event
Common stock, shares authorized				450,000,000
Amended and restated certification of incorporation \| Preferred Stock
Subsequent Event
Preferred stock, shares authorized					5,000,000
IPO
Subsequent Event
Convertible preferred stock, conversion ratio to common stock		1
Reverse stock split, conversion ratio		0.25
IPO price per share \| $ / shares			$ 7.00
IPO \| Common Stock
Subsequent Event
Shares of common stock issued			10,000,000
IPO price per share \| $ / shares	$ 7.00		$ 7.00
Shares sold to underwriters under over allotment options	1,500,000
Net proceeds from IPO \| $	$ 72.7
Underwriters' discounts and commissions \| $	5.6
Other offering expenses payable \| $	$ 2.2

Label	Element	Value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	$ 3.89