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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Stock-Based Compensation

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,

 

 

2016

 

 

2015

 

 

2016

 

 

2015

 

Cost of goods sold

$

402

 

 

$

239

 

 

$

790

 

 

$

563

 

Research and development

 

3,125

 

 

 

2,125

 

 

 

6,324

 

 

 

4,547

 

General and administrative

 

2,737

 

 

 

2,196

 

 

 

5,513

 

 

 

4,627

 

Total stock-based compensation

$

6,264

 

 

$

4,560

 

 

$

12,627

 

 

$

9,737

 

 

During the three months ended June 30, 2016 and 2015, we granted options to purchase 589,090 and 68,200 shares, respectively, at a weighted average grant-date fair value of $7.22 per share and $4.81 per share, respectively.  

During the six months ended June 30, 2016 and 2015, we granted options to purchase 789,290 and 479,010 shares, respectively, at a weighted average grant-date fair value of $6.88 per share and $6.31 per share, respectively.  

As a result of stock issuances under our equity compensation plans, during the three months ended June 30, 2016 and 2015, we issued 451,391 and 733,952 shares of our common stock, respectively, and during the six months ended June 30, 2016 and 2015, we issued 1,313,937 and 969,250 shares of our common stock, respectively.