Stock Option and Grant Plan - Summary of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
---|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
|
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | ||||
Stock-based compensation expense | $ 12,968 | $ 3,012 | $ 28,068 | $ 8,573 |
Research and Development | ||||
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | ||||
Stock-based compensation expense | 7,554 | 1,999 | 17,049 | 5,577 |
General and Administrative | ||||
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | ||||
Stock-based compensation expense | $ 5,414 | $ 1,013 | $ 11,019 | $ 2,996 |