Income Taxes - Summary of Company's Effective Tax Rate on Income From Continuing Operations and Statutory Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Income tax (benefit) expense at federal statutory rate	$ (4,760)	$ 3,687	$ 2,324
State income tax, net of federal benefit	848	581	506
Non-deductible transaction expenses			259
Non-deductible private placement warrant expense	9,531	152	130
Domestic production activity	(376)	(221)	(216)
Research tax credits	(1,054)	(44)	(240)
Tax reserve reassessment	570
Other, net		(12)	10
Income tax expense	$ 4,759	$ 4,143	$ 2,773
Income tax (benefit) expense at federal statutory rate	34.00%	34.00%	34.00%
State income tax, net of federal benefit	(6.10%)	5.40%	7.40%
Non-deductible transaction expenses			3.80%
Non-deductible private placement warrant expense	(68.00%)	1.40%	1.90%
Domestic production activity	2.70%	(2.00%)	(3.10%)
Research tax credits	7.50%	(0.40%)	(3.50%)
Tax reserve reassessment	(4.10%)
Other, net		(0.20%)	0.10%
Income tax expense	(34.00%)	38.20%	40.60%