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Stock-based Compensation - Summary of stock-based compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Total stock-based compensation expense $ 3,551 $ 35 $ 13,369 $ 399
Research and development        
Total stock-based compensation expense 2,553 8 6,242 (15)
General and administrative        
Total stock-based compensation expense $ 998 $ 27 $ 7,127 $ 414