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Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Details) - 2018 Plan - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Employee Service Share Based Compensation Allocation Of Recognized Period Costs Line Items    
Total stock-based compensation expense $ 11,499 $ 5,504
Research and Development    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs Line Items    
Total stock-based compensation expense 6,607 1,865
General And Administrative    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs Line Items    
Total stock-based compensation expense $ 4,892 $ 3,639