Income Taxes - Schedule of Income Tax Expense Comprised of Current State Taxes and Foreign Taxes (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 0	$ 0
State	(28,000)	2,000
Foreign	10,000	0
Total current tax (benefit) expense	(18,000)	2,000
Deferred:
Federal	(84,000)	0
State	(22,000)	0
Foreign	0	0
Total deferred tax (benefit) expense	(106,000)	0
Total tax (benefit) expense	$ (124,000)	$ 2,000