Long-term Debt - Schedule of Long-term Debt Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Disclosure [Abstract]
Principal amount of long-term debt	$ 35,000	$ 35,000
Long-term debt, net of current portion	35,000	35,000
Debt discount, net of accretion	(428)	(511)
Accrued end-of-term payment	762	708
Long-term debt, net of discount and current portion	$ 35,334	$ 35,197