Income Taxes - Components of Tax Benefit (Provision) Allocated to Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Current:
Federal	$ 0	$ 16
State	(7)	(9)
Foreign	(9)	(8)
Sub-total	(16)	(1)
Deferred:
Federal	0	0
State	0	0
Foreign	0	0
Sub-total	0	0
Total tax benefit (provision)	$ (16)	$ (1)