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Cash, Concentration of Credit Risk and Fair Value of Financial Instruments - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment of long-term strategic investments | $ 3,300 |  | $ 3,312 | $ 200 |
Accounts Receivable | Licensee Concentration Risk | Four Largest Licensees |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Accounts receivable percentage |  |  | 54.00% |  |
Accounts Receivable | Licensee Concentration Risk | Five Largest Licensees |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Accounts receivable percentage |  |  |  |  | 76.00%
Technicolor |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration liability |  | $ 20,500 | $ 20,500 |  |

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