Balance Sheet Components - Summary of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid insurance	$ 1,029	$ 991
Prepaid software and subscription fees	536	376
Prepaid research and development project costs	290	321
Other receivables	147	311
Other	642	416
Total prepaid expenses and other current assets	$ 2,644	$ 2,415