Income Taxes - Summary of Expense for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Current:
Federal	$ 0	$ 0
State	33	29
Foreign	6	0
Gross	39	29
Deferred:
Federal	0	0
State	0	0
Foreign	0	0
Gross	0	0
Total	$ 39	$ 29