Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred income tax assets
Net operating loss carry forwards	$ 41,356	$ 40,042
Credit carry forwards	3,292	3,557
Fixed assets	493	531
Intangibles	6,417	8,446
Equity-based compensation	439	399
Nondeductible accruals	565	465
Various reserves	55	81
Other	107	2
Valuation allowance	(52,414)	(52,948)
Total deferred income taxes - net	310	575
Deferred income tax liabilities
Foreign intangibles	(74)	(126)
Unrealized translation gain	(4)	(23)
Prepaid expenses	(41)	(22)
Total deferred income liabilities	(119)	(171)
Net deferred income tax assets	$ 191	$ 404