Stock-Based Compensation

6 Months Ended

Jun. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Note 7 — Stock-Based Compensation

Total stock-based compensation expense was recognized in our Condensed Consolidated Statements of Operations as follows (in thousands):


	Three months ended June 30,				Six months ended June 30,
	2015		2014		2015		2014
Cost of goods sold	$	239	$	280	$	563	$	599
Research and development expense		2,125		1,832		4,547		3,805
General and administrative expense		2,196		2,052		4,627		4,121

Total stock-based compensation	$	4,560	$	4,164	$	9,737	$	8,525

During the three months ended June 30, 2015 and 2014, we granted 68,200 and 642,860 stock options, respectively, at a weighted average grant-date fair value of $4.81 per share and $5.24 per share, respectively.

During the six months ended June 30, 2015 and 2014, we granted 479,010 and 3,776,040 stock options, respectively, at a weighted average grant-date fair value of $6.31 per share and $5.84 per share, respectively. The number of stock options granted during the six months ended June 30, 2014 was significantly higher than the stock options granted during the six months ended June 30, 2015 because we made our annual employee stock option grant for the 2013 performance period in February 2014 and our annual employee stock option grant for the 2014 performance period in December 2014.

As a result of stock issuances under our equity compensation plans, during the three months ended June 30, 2015 and 2014, we issued 733,952 and 350,513 common shares, respectively, and during the six months ended June 30, 2015 and 2014, we issued 969,250 and 1,017,887 common shares, respectively.