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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%