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Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Accrued Liabilities Current [Abstract]    
Accrued research and development $ 30,030 $ 36,449
Accrued payroll liabilities 7,898 11,443
Other 7,002 6,891
Total $ 44,930 $ 54,783