Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2015

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, 2015 and 2014, consisted of the following (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2015		2014		2015		2014
Cost of goods sold	$	109	$	46	$	202	$	89
Research and development	32		17		59		33
Selling, general, and administrative	424		261		824		541
Stock-based compensation expense before taxes	$	565	$	324	$	1,085	$	663

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

In applying the Black-Scholes methodology to the options granted during the six months ended June 30, 2015, the fair value of our stock-based awards granted was estimated using the following assumptions for the periods indicated below:

	Six Months Ended
	June 30, 2015			June 30, 2014
Risk-free interest rate	1.53%	-	1.57%	1.97%
Expected option life in years	5.0			5.5
Expected dividend yield	—%			—%
Expected price volatility	34.00%	-	35.11%	36.90%