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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, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income tax benefit at U.S. statutory rate		$ (9,226)	$ (2,771)
State taxes, net of valuation allowance		(103)	(314)
Stock-based compensation	[1]	154	75
Valuation allowance		7,427	306
Foreign tax differential		(1,124)	(101)
Tax credits		(167)	(279)
Impairment		1,410
Acquisition/accretion benefits		(250)	(428)
Meals and entertainment		1	59
Other expenses		(39)	(23)
Total income tax benefit		$ (1,917)	$ (3,476)
[1] Includes non-deductible stock-based compensation and excess tax benefits and shortfalls from stock-based compensation.

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Income tax reconciliation acquisition or accretion benefits.

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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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