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Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 0000010 - Statement - Consolidated Statements of Cash Flows - Reconciliation link:presentationLink link:calculationLink link:definitionLink 0000011 - Disclosure - Nature of Business link:presentationLink link:calculationLink link:definitionLink 0000012 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 0000013 - Disclosure - Sales of Subsidiary Businesses link:presentationLink link:calculationLink link:definitionLink 0000014 - Disclosure - Investments Securities and Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 0000015 - Disclosure - Property and Equipment, net link:presentationLink link:calculationLink link:definitionLink 0000016 - Disclosure - Capitalized Software Development Costs, net link:presentationLink link:calculationLink link:definitionLink 0000017 - Disclosure - Intangible Assets, net and Goodwill link:presentationLink link:calculationLink link:definitionLink 0000018 - 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Summary of Significant Accounting Policies (Tables) link:presentationLink link:calculationLink link:definitionLink 0000028 - Disclosure - Investments Securities and Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 0000029 - Disclosure - Property and Equipment, net (Tables) link:presentationLink link:calculationLink link:definitionLink 0000030 - Disclosure - Capitalized Software Development Costs, net (Tables) link:presentationLink link:calculationLink link:definitionLink 0000031 - Disclosure - Intangible Assets, net and Goodwill (Tables) link:presentationLink link:calculationLink link:definitionLink 0000032 - Disclosure - Accrued Employee Expenses (Tables) link:presentationLink link:calculationLink link:definitionLink 0000033 - Disclosure - Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 0000034 - Disclosure - Stock-Based Compensation (Tables) link:presentationLink link:calculationLink link:definitionLink 0000035 - 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Disclosure - Investments Securities and Fair Value Measurements - Investment Securities (Details) link:presentationLink link:calculationLink link:definitionLink 0000042 - Disclosure - Investments Securities and Fair Value Measurements - Available-for-sale Investments, by Remaining Contract Maturity (Details) link:presentationLink link:calculationLink link:definitionLink 0000043 - Disclosure - Investments Securities and Fair Value Measurements - Sales and Maturities (Details) link:presentationLink link:calculationLink link:definitionLink 0000044 - Disclosure - Investments Securities and Fair Value Measurements - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000045 - Disclosure - Investments Securities and Fair Value Measurements - Fair Value Measurements (Details) link:presentationLink link:calculationLink link:definitionLink 0000046 - Disclosure - Property and Equipment, net (Details) link:presentationLink link:calculationLink link:definitionLink 0000047 - Disclosure - Capitalized Software Development Costs, net - Software Development Costs (Details) link:presentationLink link:calculationLink link:definitionLink 0000048 - Disclosure - Capitalized Software Development Costs, net - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000049 - Disclosure - Capitalized Software Development Costs, net - Amortization Expense (Details) link:presentationLink link:calculationLink link:definitionLink 0000050 - Disclosure - Intangible Assets, net and Goodwill - Finite-Lived Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 0000051 - Disclosure - Intangible Assets, net and Goodwill - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 0000052 - Disclosure - Intangible Assets, net and Goodwill - Amortization Expense (Details) link:presentationLink link:calculationLink link:definitionLink 0000053 - Disclosure - Intangible Assets, net and Goodwill - 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Disclosure - Stockholders' Equity - Amended and Restated Certificate of Incorporation (Details) link:presentationLink link:calculationLink link:definitionLink 0000061 - Disclosure - Stockholders' Equity - Class A Common Stock and Class B Common Stock, Reverse Stock Split (Details) link:presentationLink link:calculationLink link:definitionLink 0000062 - Disclosure - Stockholders' Equity - Preferred Stock (Details) link:presentationLink link:calculationLink link:definitionLink 0000063 - Disclosure - Stockholders' Equity - Share Repurchase Program (Details) link:presentationLink link:calculationLink link:definitionLink 0000064 - Disclosure - Stock-Based Compensation - Stock Option Plans (Details) link:presentationLink link:calculationLink link:definitionLink 0000065 - Disclosure - Stock-Based Compensation - Stock Option Activity (Details) link:presentationLink link:calculationLink link:definitionLink 0000066 - Disclosure - Stock-Based Compensation - Restricted Stock Units (Details) link:presentationLink link:calculationLink link:definitionLink 0000067 - 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