Stock-based Compensation

3 Months Ended

Mar. 31, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-based Compensation

Stock-based Compensation. Stock-based compensation expense before income tax expense for the three-month periods ended March 31, 2012 and 2011, consisted of the following (in thousands):

	Three Months Ended
	March 31,
	2012		2011
Cost of goods sold	$	82	$	51
Research and development	32		13
Selling, general, and administrative	441		271
Stock-based compensation expense before taxes	$	555	$	335

The excess income tax benefit created from the exercises of stock options was approximately $4,000 and $1.1 million for the three-month periods ended March 31, 2012 and 2011, respectively. As of March 31, 2012, the total remaining unrecognized compensation cost related to non-vested stock options, net of expected forfeitures, was approximately $5.6 million and is expected to be recognized over a weighted average period of 3.3 years. We use the Black-Scholes methodology to value the stock-based compensation expense for options.