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Deferred Acquisition Consideration (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance of contingent payments     $ 74,671 $ 82,598
Payments     46,792 30,719
Redemption value adjustments     44,993 15,451
Additions     7,703 7,145
Foreign translation adjustment     2,227 196
Ending balance of contingent payments $ 82,802 $ 74,671 82,802 74,671
Deferred acquisition consideration 83,065 75,220 83,065 75,220
Loss attributable to fair value adjustments 41,672 9,030    
Stock-based compensation     2,806 10,048
Fixed payments        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Deferred acquisition consideration $ 263 $ 549 263 549
Contingent Payment        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Loss attributable to fair value adjustments     $ 42,187 $ 5,403