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Accrued Expenses - Summary of Accrued expenses and other current liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Accrued Expenses [Abstract]    
Accrued employee compensation and benefits $ 3,751 $ 6,150
Accrued external research and development expenses 3,028 1,772
Accrued professional fees 1,058 940
Deferred rent   1,389
Other 1,218 702
Total $ 9,055 $ 10,953