Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

Stock-based compensation expense before income tax expense for the three-month periods ended March 31, 2014 and 2013, consisted of the following (in thousands):

	Three Months Ended
	March 31,
	2014		2013
Cost of goods sold	$	43	$	54
Research and development	16		25
Selling, general, and administrative	280		380
Stock-based compensation expense before taxes	$	339	$	459

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

In applying the Black-Scholes methodology to our outstanding option grants, we used the following assumptions:

	Three Months Ended
	March 31,
	2013
Risk-free interest rate	0.65%
Expected option life	4.2 years
Expected dividend yield	—%
Expected price volatility	40.2%