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Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 0000010 - Disclosure - Description of the Business and Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 0000011 - Disclosure - Cash, Cash Equivalents and Short-Term Investments link:presentationLink link:calculationLink link:definitionLink 0000012 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 0000013 - Disclosure - Property and Equipment, Net link:presentationLink link:calculationLink link:definitionLink 0000014 - Disclosure - Business Combinations link:presentationLink link:calculationLink link:definitionLink 0000015 - Disclosure - Intangible Assets link:presentationLink link:calculationLink link:definitionLink 0000016 - Disclosure - Goodwill link:presentationLink link:calculationLink link:definitionLink 0000017 - Disclosure - Debt link:presentationLink link:calculationLink link:definitionLink 0000018 - 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Description of the Business and Summary of Significant Accounting Policies - Revenue Recognition (Details) link:presentationLink link:calculationLink link:definitionLink 0000043 - Disclosure - Description of the Business and Summary of Significant Accounting Policies - Stock-based Compensation (Details) link:presentationLink link:calculationLink link:definitionLink 0000044 - Disclosure - Description of the Business and Summary of Significant Accounting Policies - Advertising and promotional expense (Details) link:presentationLink link:calculationLink link:definitionLink 0000045 - Disclosure - Description of the Business and Summary of Significant Accounting Policies - Concentrations of Credit Risk (Details) link:presentationLink link:calculationLink link:definitionLink 0000046 - Disclosure - Description of the Business and Summary of Significant Accounting Policies - Receivables (Details) link:presentationLink link:calculationLink link:definitionLink 0000047 - Disclosure - Description of the Business and Summary of Significant Accounting Policies - Deferred Commissions, Net (Details) link:presentationLink link:calculationLink link:definitionLink 0000048 - Disclosure - Description of the Business and Summary of Significant Accounting Policies - Property and Equipment, Net (Details) link:presentationLink link:calculationLink link:definitionLink 0000049 - Disclosure - Description of the Business and Summary of Significant Accounting Policies - Lease obligations (Details) link:presentationLink link:calculationLink link:definitionLink 0000050 - Disclosure - Description of the Business and Summary of Significant Accounting Policies - Long-lived assets, including goodwill and other acquired intangible assets, net (Details) link:presentationLink link:calculationLink link:definitionLink 0000051 - Disclosure - Description of the Business and Summary of Significant Accounting Policies - Income taxes (Details) link:presentationLink link:calculationLink link:definitionLink 0000052 - Disclosure - Cash, Cash Equivalents and Short-Term Investments - Schedule of Cash, Cash Equivalents and Short-Term Investments (Details) link:presentationLink link:calculationLink link:definitionLink 0000052 - Disclosure - Cash, Cash Equivalents and Short-Term Investments - Schedule of Cash, Cash Equivalents and Short-Term Investments (Details) link:presentationLink link:calculationLink link:definitionLink 0000053 - Disclosure - Cash, Cash Equivalents and Short-Term Investments - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000054 - Disclosure - Cash, Cash Equivalents and Short-Term Investments - Contractual Maturities of Short Term Investments (Details) link:presentationLink link:calculationLink link:definitionLink 0000055 - Disclosure - Cash, Cash Equivalents and Short-Term Investments - Unrealized Loss Position Aggregated By Investment (Details) link:presentationLink link:calculationLink link:definitionLink 0000056 - Disclosure - Fair Value Measurements - Fair Value on Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 0000057 - Disclosure - Fair Value Measurements - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000058 - Disclosure - Property and Equipment, Net - Schedule of Property and Equipment, Net (Details) link:presentationLink link:calculationLink link:definitionLink 0000059 - Disclosure - Property and Equipment, Net - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000060 - Disclosure - Business Combinations - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000061 - Disclosure - Business Combinations - Schedule of Purchase Consideration (Details) link:presentationLink link:calculationLink link:definitionLink 0000062 - Disclosure - Business Combinations - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) link:presentationLink link:calculationLink link:definitionLink 0000063 - Disclosure - Business Combinations - Schedule of Assets Acquired (Details) link:presentationLink link:calculationLink link:definitionLink 0000064 - 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Disclosure - Stockholders’ (Deficit) Equity - Common and Preferred Stock (Details) link:presentationLink link:calculationLink link:definitionLink 0000080 - Disclosure - Stockholders’ (Deficit) Equity - Stock Repurchase Program (Details) link:presentationLink link:calculationLink link:definitionLink 0000081 - Disclosure - Stockholders’ (Deficit) Equity - Equity Incentive Plans (Details) link:presentationLink link:calculationLink link:definitionLink 0000082 - Disclosure - Stockholders’ (Deficit) Equity - Schedule of Stock Option and Restricted Stock Activity (Details) link:presentationLink link:calculationLink link:definitionLink 0000083 - Disclosure - Stockholders’ (Deficit) Equity - Schedule of Pre-Tax Intrinsic Value of Options Exercised (Details) link:presentationLink link:calculationLink link:definitionLink 0000084 - Disclosure - Stockholders’ (Deficit) Equity - Assumed Stock Options (Details) link:presentationLink link:calculationLink link:definitionLink 0000085 - Disclosure - Stockholders’ (Deficit) Equity - Fair Value of Stock Option Assumptions Used (Details) link:presentationLink link:calculationLink link:definitionLink 0000086 - Disclosure - Stockholders’ (Deficit) Equity - Co-Founder Grants (Details) link:presentationLink link:calculationLink link:definitionLink 0000087 - Disclosure - Net Income (Loss) Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) link:presentationLink link:calculationLink link:definitionLink 0000088 - Disclosure - Net Income (Loss) Per Share - Schedule of Potentially Dilutive Securities Excluded from Computation (Details) link:presentationLink link:calculationLink link:definitionLink 0000089 - Disclosure - Income Taxes - Schedule of Loss from Continuing Operations Before Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 0000090 - Disclosure - Income Taxes - Components of Income Tax Expense (Benefit) (Details) link:presentationLink link:calculationLink link:definitionLink 0000091 - Disclosure - Income Taxes - 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