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Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Payables And Accruals [Abstract]    
Accrued employee compensation and benefits $ 587 $ 1,443
Accrued external research and development expense 666 2,191
Accrued external manufacturing costs 382 161
Other 1,115 984
Total $ 2,750 $ 4,779