Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2016

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, 2016 and 2015, consisted of the following (in thousands):

	Three Months Ended March 31,
	2016		2015
Cost of goods sold	$	123	$	93
Research and development	42		27
Selling, general, and administrative	459		400
Stock-based compensation expense before taxes	$	624	$	520

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

In applying the Black-Scholes methodology to the options granted during the three-month periods ended March 31, 2016 and 2015, the fair value of our stock-based awards granted was estimated using the following assumptions for the periods indicated below:

	Three months ended March 31,
	2016	2015
Risk-free interest rate	1.40%	1.53%
Expected option life	5.0	5.0
Expected dividend yield	—%	—%
Expected price volatility	37.06%	35.11%