Stock-based Compensation (Tables)

9 Months Ended

Sep. 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 nine-month periods ended September 30, 2014 and 2013, consisted of the following (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2014		2013		2014		2013
Cost of goods sold	$	19	$	18	109		$	98
Research and development	24		20		57		69
Selling, general, and administrative	298		251		838		905
Stock-based compensation expense before taxes	$	341	$	289	$	1,004	$	1,072

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:

	Nine Months Ended
	September 30,	September 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%	34.08% - 41.67%