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Disclosure - Description of Business and Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 0000010 - Disclosure - Revenue link:presentationLink link:calculationLink link:definitionLink 0000011 - Disclosure - Investments and Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 0000012 - Disclosure - Financial Statement Components link:presentationLink link:calculationLink link:definitionLink 0000013 - Disclosure - Goodwill and Intangible Assets link:presentationLink link:calculationLink link:definitionLink 0000014 - Disclosure - Debt link:presentationLink link:calculationLink link:definitionLink 0000015 - Disclosure - Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 0000016 - Disclosure - Net Loss Per Share link:presentationLink link:calculationLink link:definitionLink 0000017 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 0000018 - 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Disclosure - Description of Business and Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9954490 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Advertising Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9954491 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Commissions (Details) link:presentationLink link:calculationLink link:definitionLink 9954492 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9954493 - Disclosure - Revenue - Schedule of Contract Balances (Details) link:presentationLink link:calculationLink link:definitionLink 9954494 - Disclosure - Revenue - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954494 - 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Disclosure - Commitments and Contingencies - Schedule of Future Minimum Lease Payments for Hosting, Telecommunication Usage Services (Details) link:presentationLink link:calculationLink link:definitionLink 9954533 - Disclosure - Commitments and Contingencies - Universal Services Fund Liability (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9954534 - Disclosure - Commitments and Contingencies - State and Local Taxes and Surcharges (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9954535 - Disclosure - Geographical Information - Schedule of Revenue and Property and Equipment by Geographic Region (Details) link:presentationLink link:calculationLink link:definitionLink 9954536 - Disclosure - Retirement Plans (Details) link:presentationLink link:calculationLink link:definitionLink 9954537 - Disclosure - Leases - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954538 - Disclosure - Leases - 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