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Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Accrued Liabilities Current [Abstract]    
Payroll and employee-related costs $ 14,327 $ 15,229
Research costs 15,973 9,434
Licensing fees 915 750
Professional fees 1,762 2,040
Intellectual property costs 1,864 2,311
Accrued property and equipment 566 407
Other 38 9
Total $ 35,445 $ 30,180