Supplemental Balance Sheet Information - Components of Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accrued Liabilities Current [Abstract]
Accrued payroll and compensation	$ 3,687	$ 3,629
Accrued research and development expenses	1,250	751
Accrued professional services	384	421
Accrued interest	974	940
Operating lease liabilities	1,174	1,151
Other accrued expenses	869	620
Total accrued expenses and other current liabilities	$ 8,338	$ 7,512