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Balance Sheet Components - Summary of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Payables And Accruals [Abstract]    
Accrued research and development costs $ 44,776 $ 34,398
Employee-related 11,393 14,769
Professional services 9,965 5,184
Other 661 500
Total accrued expenses $ 66,795 $ 54,851