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Income Taxes - Schedule of Reconciliation of Gross Net Operating Loss (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Abstract] |  |  |  |
NOLs | $ 26,070 | $ 109,839 | $ 140,959 | $ 136,515
NOLs deemed worthless | (3,487) | (3,487) |  |
Unrecognized stock-based compensation | (17,863) | (101,108) |  |
Gross NOLs available for deferred tax asset | $ 4,720 | $ 5,244 |  |
Tax rate | 38.74% | 38.38% |  |
Tax affected | $ 1,828 | $ 2,013 |  |

X
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