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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
	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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