Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Payables And Accruals [Abstract]
Accrued research and development expenses	$ 1,498	$ 991
Accrued employee bonus compensation	2,012	2,190
Other accrued expenses	1,352	960
Accrued co-pay rebates	836
Total accrued expenses	$ 5,698	$ 4,141