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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Effective Income Tax Rate Reconciliation
Provision (benefit) at statutory rate of 35%	$ (1,067)	$ 7,618	$ 7,800
State provision, net of federal benefit	(393)	519	922
Research and development credits	(916)	(1,734)
Domestic manufacturing deduction	(641)	(762)	(389)
Sale of business			341
Change in valuation allowance	954		872
Uncertain tax positions	(311)	(67)	126
Nondeductible expenses	370	278	190
Other	(122)	(331)	(244)
Total	$ (2,126)	$ 5,521	$ 9,618
Effective tax (benefit) rate	(69.70%)	25.40%	43.20%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deductions. Including, but not limited to, extraterritorial income exclusion deduction, qualified production activity deduction, dividend deduction, deduction for dividend paid to employee stock ownership plan, Medicare prescription drug benefit subsidy deduction, and other deductions.

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