Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2013

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 taxes for the three and six-month periods ended June 30, 2013 and 2012 consisted of the following (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2013		2012		2013		2012
Cost of goods sold	$	26	$	59	$	80	$	141
Research and development	24		35		49		67
Selling, general, and administrative	274		376		654		817
Stock-based compensation expense before income taxes	$	324	$	470	$	783	$	1,025

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

During the three and six-month periods ended June 30, 2013, we granted awards representing 125,000 and 175,000 shares, respectively, of our common stock. During the three and six-month periods ended June 30, 2012, we granted awards representing 120,000 shares of common stock. We use the Black-Scholes methodology to value the stock-based compensation expense for options. In applying the Black-Scholes methodology to our outstanding option grants, we used the following assumptions:

	Six Months Ended
	June 30,
	2013	2012
Risk-free interest rate	0.65% - 1.16%	0.95%
Expected option life	4.2 - 6.0 years	6.0 years
Expected dividend yield	—	—
Expected price volatility	40.20% - 41.67%	42.01%