Share-based Compensation Expense

3 Months Ended

Mar. 31, 2013

Share-based Compensation Expense

6. Share-based Compensation Expense

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

	Three Months Ended March 31,
	2013		2012
Research and development	$	403	$	345
Selling, general and administrative		2,025		1,638
Total share-based compensation expense	$	2,428	$	1,983

For the three months ended March 31, 2013 and 2012, we incurred share-based compensation expense due to the following types of awards (in thousands):

	Three Months Ended March 31,
	2013		2012
Performance rights	$	340	$	606
Restricted stock		1,995		1,325
Options		93		52
Total share-based compensation expense	$	2,428	$	1,983