Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses - Schedule of Accrued Expenses (Detail)

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Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Accrued Liabilities Current [Abstract]    
External research and preclinical development $ 5,824 $ 5,395
Employee compensation and benefits 2,355 4,174
Professional fees 496 694
Facilities and other 46 383
Total accrued expenses $ 8,721 $ 10,646