Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 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 and six-month periods ended June 30, 2014 and 2013, consisted of the following (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2014		2013		2014		2013
Cost of goods sold	$	46	$	26	89		$	80
Research and development	17		24		33		49
Selling, general, and administrative	261		274		541		654
Stock-based compensation expense before taxes	$	324	$	324	$	663	$	783

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:

	Six Months Ended
	June 30,	June 30,
	2014	2013
Risk-free interest rate	1.97%	0.65% - 1.16%
Expected option life	5.5 years	4.2 - 6.0 years
Expected dividend yield	—%	—%
Expected price volatility	36.90%	40.20% - 41.67%