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Income Taxes - Summary of Company's Effective Tax Rate on Income From Continuing Operations and Statutory Tax Rate (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income tax (benefit) expense at federal statutory rate |  |  |  |  |  |  |  |  | $ 4,862 | $ 12,089 | $ (4,760)
State income tax, net of federal benefit |  |  |  |  |  |  |  |  | 178 | 1,403 | 848
Non-deductible private placement warrant (income)/expense |  |  |  |  |  |  |  |  | (3,255) | (2,159) | 9,531
Domestic production activity |  |  |  |  |  |  |  |  |  | (295) | (376)
Research tax credits |  |  |  |  |  |  |  |  | (2,437) | (1,001) | (1,054)
Tax reserve reassessment |  |  |  |  |  |  |  |  | 315 | 170 | 570
Other, net |  |  |  |  |  |  |  |  | (51) | 606 |
Income tax expense | $ (2,591) | $ (466) | $ 1,285 | $ 1,384 | $ 3,309 | $ 3,996 | $ 2,250 | $ 1,258 | $ (388) | $ 10,813 | $ 4,759
Income tax (benefit) expense at federal statutory rate |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 34.00%
State income tax, net of federal benefit |  |  |  |  |  |  |  |  | 1.30% | 4.00% | (6.10%)
Non-deductible private placement warrant (income)/expense |  |  |  |  |  |  |  |  | (23.40%) | (6.20%) | (68.00%)
Domestic production activity |  |  |  |  |  |  |  |  |  | (0.90%) | 2.70%
Research tax credits |  |  |  |  |  |  |  |  | (17.60%) | (2.90%) | 7.50%
Tax reserve reassessment |  |  |  |  |  |  |  |  | 2.30% | 0.50% | (4.10%)
Other, net |  |  |  |  |  |  |  |  | (0.40%) | 1.80% |
Income tax expense |  |  |  |  |  |  |  |  | (2.80%) | 31.30% | (34.00%)

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