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Long-term Debt - Schedule of Long-term Debt Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
Long-term Debt, Gross $ 35,000 $ 35,000
Long-term debt, net of current portion 35,000 35,000
Debt discount, net of accretion (511) (834)
Accrued end-of-term payments 708 491
Long-term debt, net of discount and current portion $ 35,197 $ 34,657