Equity-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2013

Equity-Based Compensation

Equity-based compensation expense

Equity-based compensation expense, for the three and six months ended June 30, 2013 and 2012 consisted of the following (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Cost of product sales	$	35	$	68	$	58	$	146
Research and development	365		525		1,297		947
Selling, general and administrative	1,539		984		2,866		2,169
Total equity-based compensation expense	$	1,939	$	1,577	$	4,221	$	3,262