Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred income tax assets
Net operating loss carry forwards	$ 40,042	$ 54,165
Credit carry forwards	3,557	3,464
Fixed assets	531	985
Intangibles	8,446	15,894
Equity-based compensation	399	688
Nondeductible accruals	465	1,346
Various reserves	81	132
Other	2	22
Valuation allowance	(52,948)	(76,648)
Total deferred income taxes - net	575	48
Deferred income tax liabilities
Foreign intangibles	(126)	(181)
Unrealized translation loss		9
Unrealized translation gain	(23)
Prepaid expenses	(22)	(57)
Total deferred income liabilities	(171)	(229)
Net deferred income tax assets (liabilities)	$ 404
Net deferred income tax liabilities		$ (181)