Income Taxes - Schedule of Income Tax Expense Comprised of Current State Taxes and Foreign Taxes (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Current:
Federal	$ 0	$ 0
State	(2,000)	28,000
Foreign	0	(10,000)
Total current tax (expense) benefit	(2,000)	18,000
Deferred:
Federal	0	84,000
State	0	22,000
Foreign	0	0
Total deferred tax (expense) benefit	0	106,000
Total tax (expense) benefit	$ (2,000)	$ 124,000