Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2013

Stockholders' Equity Note [Abstract]

Schedule of stock options available for grant

The following table presents the shares available for grant as of September 30, 2013 (in thousands):

	Shares available for grant
December 31, 2012	3,767
Annual increase in shares available for grant	1,507
Option grants	(922	)
Restricted stock unit award grants	(1,367	)
Restricted stock unit award shares withheld for taxes	132
Options forfeited	1,968
Restricted stock unit awards forfeited	335
September 30, 2013	5,420

Schedule of stock-based compensation expense

The following table presents total stock-based compensation expense by functional areas included in the condensed consolidated statements of operations for the three and nine months ended September 30, 2013 and 2012 (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Research and development	$	97	$	682	$	989	$	2,183
Selling, general and administrative	529		784		2,372		2,360
Total	$	626	$	1,466	$	3,361	$	4,543

The following table presents total stock-based compensation expense by security types included in the condensed consolidated statements of operations for the three and nine months ended September 30, 2013 and 2012 (in thousands):

	Three Months Ended September 30,					Nine Months Ended September 30,
	2013			2012		2013		2012
Stock options	$	397		$	900	$	1,538	$	3,255
Restricted stock units	527			566		1,823		1,288
Performance stock units	(298		)	—		—		—
Total	$	626		$	1,466	$	3,361	$	4,543