Balance Sheet Components - Summary of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accrued Liabilities Current [Abstract]
Accrued research and development expenses	$ 2,404	$ 3,260
Accrued compensation	3,573	2,543
Accrued professional services	1,274	524
Accrued construction costs	1,917
Other accrued expenses	82	170
Total accrued liabilities	$ 9,250	$ 6,497

Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

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