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Business Combinations and Other Transactions - Narrative (Details) patent_and_application in Thousands, coding_patent_and_application in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 19, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | May 31, 2019 engineer office | Jul. 30, 2018 coding_patent_and_application | Jul. 30, 2018 patent_and_application
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Gain on asset acquisition |  |  | $ 14,200,000 |  | $ 14,200,000 |  |  |  |
Interest expense debt |  | $ 6,828,000 |  | $ 4,656,000 | 17,087,000 | $ 13,849,000 |  |  |
Proceeds from sale of business | $ 10,000,000.0 |  |  |  | 10,000,000 | 0 |  |  |
Gain on sale of business |  | 8,500,000 |  |  | 8,500,000 |  |  |  |
Technicolor |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of patents and applications |  |  |  |  |  |  |  | 3 | 18
Number of engineers | engineer |  |  |  |  |  |  | 340 |  |
Number of R&D offices worldwide | office |  |  |  |  |  |  | 8 |  |
Gain on derecognition of contingent consideration liability |  |  | $ 20,500,000 |  | 20,500,000 |  |  |  |
Receive future cash receipts percentage |  |  |  |  |  |  | 42.50% |  |
Combined accumulated projected benefit obligation |  | $ 6,500,000 |  |  | 6,500,000 |  |  |  |
Service cost and interest cost |  |  |  |  | $ 100,000 |  |  |  |
Effective interest rate acquisition percentage |  | 14.50% |  |  | 14.50% |  |  |  |
Interest expense debt |  | $ 700,000 |  |  | $ 2,000,000.0 |  |  |  |
Transaction and integration related costs |  | 2,100,000 |  | $ 5,400,000 | 6,900,000 | $ 9,200,000 |  |  |
Technicolor | Shortfalls funding |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Shortfalls funding amount |  | $ 25,000,000.0 |  |  | $ 25,000,000.0 |  |  |  |
Shortfall funding plus percentage |  |  |  |  | 25.00% |  |  |  |

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