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Commitments and Contingencies - Employee Contracts and Severance Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Employment contracts      
Restructuring Cost and Reserve [Line Items]      
Maximum term of executive's annual base salary to determine severance obligations   12 months  
Employee Severance [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve   $ 1,061 $ 28
Cash Payments   (7,481)  
Employee Severance [Member] | Reorganization Plan [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance costs $ 8,300    
Employee Severance [Member] | Technology and development | Reorganization Plan [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance costs   $ 1,600