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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)

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