Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2012

Stock-Based Compensation [Abstract]

Total stock-based compensation expense

	Three months ended March  31,
	2012		2011
Cost of goods sold	$	408	$	332
Research and development expense		1,923		1,969
General and administrative expense		1,903		2,501
Total stock-based compensation cost	$	4,234	$	4,802