Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Total Stock-Based Compensation Expense

Total stock-based compensation expense was allocated to research and development, manufacturing and production and general and administrative expense as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Research and development	$	155	$	245	$	709	$	803
Manufacturing and production		68		53		196		158
General and administrative		509		437		1,781		1,617
Total stock-based compensation expense	$	732	$	735	$	2,686	$	2,578