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Computation of Income Tax Benefit from Continuing Operations Using Federal Statutory Rate (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income tax benefit at U.S. statutory rate		$ (873)	$ (9,226)
State taxes, net of valuation allowance		(448)	(103)
Stock-based compensation	[1]	434	154
Valuation allowance		3,334	7,427
Foreign tax differential		(747)	(1,124)
Tax credits		(544)	(368)
Impairment			1,533
Acquisition/accretion benefits		(1)	(250)
Gain on CARES Act loan		(1,089)
Meals and entertainment		68	1
Other expenses		98	39
Total income tax expense (benefit)		$ 232	$ (1,917)
[1] Includes non-deductible stock-based compensation and excess tax benefits and shortfalls from stock-based compensation.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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