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Stock-Based Compensation - Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Stock-Based Compensation        
Stock-based compensation expense $ 2,518 $ 936 $ 4,562 $ 1,484
Research and development        
Stock-Based Compensation        
Stock-based compensation expense 1,278 455 2,286 894
General and administrative        
Stock-Based Compensation        
Stock-based compensation expense $ 1,240 $ 481 $ 2,276 $ 590