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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Stock-based compensation expense    
Total stock-based compensation expense $ 4,965 $ 3,208
Research and development    
Stock-based compensation expense    
Total stock-based compensation expense 3,067 1,734
General and administrative    
Stock-based compensation expense    
Total stock-based compensation expense $ 1,898 $ 1,474