Income Taxes - Components of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Current taxes:
Federal	$ (5)	$ 0
State	(110)	50
Total current income tax benefit (expense)	(115)	50
Deferred taxes:
Federal	0	0
State	0	0
Total deferred income tax benefit (expense)	0	0
Total income tax benefit (expense)	$ (115)	$ 50