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Stock-based Compensation - Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Stock-based compensation disclosures    
Compensation expense $ 11,431 $ 12,204
Research and development    
Stock-based compensation disclosures    
Compensation expense 3,695 3,966
General and administrative    
Stock-based compensation disclosures    
Compensation expense $ 7,736 $ 8,238