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Deferred Acquisition Consideration - Impact of Redemption Value Adjustments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Business Combinations [Abstract]          
Loss (income) attributable to fair value adjustments $ 5,612 $ 2,312 $ 17,297 $ (2,288)  
Stock-based compensation 548 (496) 1,255 1,529  
Redemption value adjustments $ 6,160 $ 1,816 $ 18,552 $ (759) $ 44,993