2107100 - Disclosure - Business Combinations
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2407403 - Disclosure - Business Combinations - Allocation of Estimated Fair Values of Net Assets Acquired (Details)
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2407402 - Disclosure - Business Combinations (Details)
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2307301 - Disclosure - Business Combinations (Tables)
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2104100 - Disclosure - Cash, Cash Equivalents and Investments
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2404404 - Disclosure - Cash, Cash Equivalents and Investments - Narrative (Details)
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2404402 - Disclosure - Cash, Cash Equivalents and Investments - Schedule of Cash, Cash Equivalents and Investments (Details)
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2404403 - Disclosure - Cash, Cash Equivalents and Investments - Summary of Available-for-sale Securities' Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value by Significant Investment Category (Details)
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2304301 - Disclosure - Cash, Cash Equivalents and Investments (Tables)
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2106100 - Disclosure - Commitments and Contingencies
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2406401 - Disclosure - Commitments and Contingencies - Narrative (Details)
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1001000 - Statement - Condensed Consolidated Balance Sheets
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1001501 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)
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1004000 - Statement - Condensed Consolidated Statements of Cash Flows
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1003000 - Statement - Condensed Consolidated Statements of Comprehensive Loss
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1002000 - Statement - Condensed Consolidated Statements of Operations
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2110100 - Disclosure - Convertible Promissory Note Receivable
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2410402 - Disclosure - Convertible Promissory Note Receivable - Narrative (Details)
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2410403 - Disclosure - Convertible Promissory Note Receivable - Schedule of Interest Rates And Amortization Discount (Details)
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2310301 - Disclosure - Convertible Promissory Note Receivable (Tables)
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2111100 - Disclosure - Debt Instruments
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2411403 - Disclosure - Debt Instruments - Convertible Debt Offering Due 2020 (Details)
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2411404 - Disclosure - Debt Instruments - Convertible Debt Offering Due 2023 (Details)
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2411406 - Disclosure - Debt Instruments - Convertible Debt Offerings (Details)
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2411407 - Disclosure - Debt Instruments - Credit Facility (Details)
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2411402 - Disclosure - Debt Instruments - Schedule of Long-Term Debt (Details)
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2411405 - Disclosure - Debt Instruments - Summary of the Effective Interest Rate, Contractually Stated Interest Expense and Costs Related to Amortization of Discount for the Notes (Details)
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2311301 - Disclosure - Debt Instruments (Tables)
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2101100 - Disclosure - Description of Business and Basis of Presentation
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2109100 - Disclosure - Dispositions
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2409401 - Disclosure - Dispositions - Narrative (Details)
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0001000 - Document - Document and Entity Information
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2105100 - Disclosure - Fair Value
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2405403 - Disclosure - Fair Value - Narrative (Details)
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2405402 - Disclosure - Fair Value - Schedule of Fair Value of Financial Assets and Liabilities Inputs (Details)
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2305301 - Disclosure - Fair Value (Tables)
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2108100 - Disclosure - Goodwill and Intangible Assets
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2408404 - Disclosure - Goodwill and Intangible Assets - Narrative (Details)
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2408405 - Disclosure - Goodwill and Intangible Assets - Schedule of Future Amortization Expense Related to Finite-lived Intangible Assets (Details)
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2408402 - Disclosure - Goodwill and Intangible Assets - Summary of Changes in Carrying Amount of Goodwill (Details)
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2408403 - Disclosure - Goodwill and Intangible Assets - Summary of Gross Carrying Amounts and Accumulated Amortization of Intangible Assets (Details)
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2308301 - Disclosure - Goodwill and Intangible Assets (Tables)
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2416401 - Disclosure - Income Taxes (Details)
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2116100 - Disclosure - Income Taxes (Notes)
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2114100 - Disclosure - Net Loss Per Common Share
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2414404 - Disclosure - Net Loss Per Common Share - Narrative (Details)
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2414402 - Disclosure - Net Loss Per Common Share - Schedule of the Computation of Historical Basic and Diluted Net Loss Per Share (Details)
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2414403 - Disclosure - Net Loss Per Common Share - Schedule of Potential Common Shares Outstanding Excluded from the Computation of Diluted Net Loss Per Share (Details)
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2314301 - Disclosure - Net Loss Per Common Share (Tables)
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2112100 - Disclosure - Redeemable Convertible Preferred Stock
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2412402 - Disclosure - Redeemable Convertible Preferred Stock - Narrative (Details)
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2412403 - Disclosure - Redeemable Convertible Preferred Stock - Schedule of Redeemable Convertible Preferred Stock (Details)
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2312301 - Disclosure - Redeemable Convertible Preferred Stock (Tables)
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2115100 - Disclosure - Restructuring Charges
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2415401 - Disclosure - Restructuring Charges (Details)
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2103100 - Disclosure - Revenues
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2403401 - Disclosure - Revenues (Details)
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2417401 - Disclosure - Sirius XM Holdings Inc. Merger Agreement (Details)
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2117100 - Disclosure - Sirius XM Holdings Inc. Merger Agreement (Notes)
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2113100 - Disclosure - Stock-based Compensation Plans and Awards
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2413405 - Disclosure - Stock-based Compensation Plans and Awards - ESPP Narrative (Details)
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2413404 - Disclosure - Stock-based Compensation Plans and Awards - RSUs Narrative (Details)
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2413403 - Disclosure - Stock-based Compensation Plans and Awards - Schedule of Assumptions Used for Determining the Per-Share Fair Value (Details)
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2413406 - Disclosure - Stock-based Compensation Plans and Awards - Schedule of Stock-Based Compensation Expenses Related to All Employee and Non-employee Stock-based Awards (Details)
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2413402 - Disclosure - Stock-based Compensation Plans and Awards - Stock Options Narrative (Details)
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2313301 - Disclosure - Stock-based Compensation Plans and Awards (Tables)
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2102100 - Disclosure - Summary of Significant Accounting Policies
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2402402 - Disclosure - Summary of Significant Accounting Policies (Details)
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2202201 - Disclosure - Summary of Significant Accounting Policies (Policies)
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