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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred income tax assets |  |
Net operating loss carry forwards | $ 53,986 | $ 48,003
Credit carry forwards | 3,464 | 3,708
Fixed assets | 985 | 1,181
Intangibles | 15,894 | 19,588
Equity based compensation | 688 | 311
Nondeductible accruals | 1,346 | 1,977
Various reserves | 132 | 142
Other | 29 | 56
Valuation allowance | (76,648) | (74,907)
Total deferred income taxes - net | (124) | 59
Deferred income tax liabilities |  |
Prepaid expenses | (57) | (59)
Total deferred income liabilities | (57) | (59)
Net deferred income tax assets (liabilities) | $ (181) | $ 0

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