Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2012

Stock-Based Compensation [Abstract]

Assumptions used in the Black-Scholes option-pricing model

The assumptions used in the Black-Scholes option-pricing model for the three and six months ended June 30, 2012 and 2011 are as follows:

	Three Months Ended June 30,		Six Months Ended June 30,
	2012	2011	2012	2011
Risk free interest rate	0.7% to 1.0%	1.8% to 2.6%	0.2% to 1.2%	1.8% to 2.6%
Expected term	5.0 to 6.1 years	5.1 to 6.1 years	5.0 to 6.1 years	5.0 to 6.1 years
Expected volatility	81.5% to 82.8%	72.3% to 75.2%	80.6% to 82.8%	72.3% to 89.7%
Expected dividend yield	0.0%	0.0%	0.0%	0.0%

Stock-based compensation expense

The Company recognized stock-based compensation expense as follows (in thousands):

	Three Months Ended June  30,				Six Months Ended June  30,
	2012		2011		2012		2011
Cost of sales	$	47	$	36	$	76	$	62
Research and development		236		186		431		331
Selling, general and administrative		1,255		1,010		2,287		1,790
Total	$	1,538	$	1,232	$	2,794	$	2,183