Stock-Based Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2013

Stock-Based Compensation Expense Components

The following table summarizes the components of share-based compensation expense related to stock options, restricted stock units and awards (“RSUs” and “RSAs”), performance-based restricted stock units (“PSUs”) and the 2011 ESPP for the three months ended March 31, 2013 and 2012 (in thousands):

	Three Months Ended March 31,
	2013		2012
Stock options	$	3,255	$	3,111
RSUs/RSAs		690		422
PSUs		35		338
ESPP		25		119
Stock-based compensation expense	$	4,005	$	3,990

Stock-Based Compensation Expense Allocation

The following table summarizes the of share-based compensation expense for the three months ended March 31, 2013 and 2012 (in thousands):

	Three Months Ended
	March 31,
	2013		2012
Research and development	$	1,089	$	925
Sales, general and administrative		2,916		3,065
Total	$	4,005	$	3,990