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Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses and Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Accrued Liabilities Current [Abstract]    
Compensation and benefit costs $ 5,761 $ 3,028
Research and development costs 7,540 5,794
Consulting and professional fees 1,028 917
License agreement 8,000  
Other liabilities 196 115
Accrued expenses $ 22,525 $ 9,854