Stock Plans (Tables)

6 Months Ended

Jun. 30, 2012

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of stock-based compensation expense

The fair value of the ESPP shares was estimated using the Black-Scholes valuation model for a call and a put option with the following weighted-average assumptions:

	Three and Six Months Ended June 30,
	2012			2011
Expected dividends	$	—		$	—
Exercise price	$	16.24		$	18.89
Expected volatility		63	%		48	%
Average risk-free interest rate		0.06	%		0.19	%
Expected life/term (in years)		0.5			0.5
Fair value per share	$	5.26		$	5.51

Schedule of stock-based compensation expense

Compensation cost for restricted stock, restricted stock units, employee stock options and the ESPP included in cost of revenue; selling, general and administrative expense; and research and development expense is as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Cost of revenue	$	238	$	84	$	380	$	203
Selling, general and administrative		411		597		1,374		1,242
Research and development		121		108		302		261
Total stock-based compensation expense	$	770	$	789	$	2,056	$	1,706

Restricted Stock Awards [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of employee stock purchase plan weighted-average assumptions

The following table summarizes the amount of compensation expense recognized for restricted stock awards for the three and six months ended June 30, 2012 and 2011 (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Service-based restricted stock	$	368	$	234	$	847	$	465
Performance-based restricted stock		97		90		160		150
Total compensation expense recognized for restricted stock awards	$	465	$	324	$	1,007	$	615