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Debt - Schedule of Long-term Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Debt Disclosure [Abstract]    
Notes payable, gross $ 7,222 $ 8,055
Less: Unamortized debt discount and issuance costs (76) (93)
Accretion of final payment fee 369 339
Carrying value of notes payable 7,515 8,301
Less: Current portion of long-term debt (3,298) (3,295)
Long-term debt, net of issuance costs and discount $ 4,217 $ 5,006