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Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]    
Accrued employee compensation and benefits $ 1,185 $ 2,500
Accrued external research and development expense 3,436 2,987
Accrued external manufacturing costs 590 750
Other 912 894
Total $ 6,123 $ 7,131