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Stock Based Compensation and Restricted Stock Compensation
 6 Months Ended
Jun. 30, 2016
Stock Based Compensation and Restricted Stock Compensation [Abstract]  
Stock Based Compensation and Restricted Stock Compensation
 (4)Stock Based Compensation and Restricted Stock Compensation

For the three and six months ended June 30, 2016, we recognized stock-based compensation expense of $1,385,000 and $2,977,000, respectively. For the three and six months ended June 30, 2015 we recognized stock-based compensation expense of $904,000 and $1,128,000, respectively.

The following table summarizes stock-based compensation for the three and six months ended June 30, 2016 and 2015:

  
Three months ended
June 30,
  
Six months ended
June 30,
 
  
2016
  
2015
  
2016
  
2015
 
Research and development
 
$
314,000
  
$
86,000
  
$
664,000
  
$
104,000
 
Selling, general and administrative
  
1,071,000
   
818,000
   
2,313,000
   
1,024,000
 
Stock-based compensation expense included in operating expense
 
$
1,385,000
  
$
904,000
  
$
2,977,000
  
$
1,128,000
 
 
For the three and six months ended June 30, 2016 we granted 125,000 and 1,440,000 stock options, respectively, and for the three and six months ended June 30, 2015 we granted 1,695,000 and 1,815,000 stock options.

For the three and six months ended June 30, 2016, we recognized restricted stock compensation expense of $987,000 and $2,879,000, respectively. For the three and six months ended June 30, 2015 we recognized stock-based compensation expense of $1,036,000 and $1,036,000, respectively.

The following table summarizes restricted stock compensation expense for the three and six months ended June 30, 2016 and 2015:

  
Three months ended
June 30,
  
Six months ended
June 30,
 
  
2016
  
2015
  
2016
  
2015
 
Research and development
 
$
62,000
  
$
75,000
  
$
200,000
  
$
91,000
 
Selling, general and administrative
  
925,000
   
961,000
   
2,679,000
   
977,000
 
Restricted stock compensation expense included in operating expense
 
$
987,000
  
$
1,036,000
  
$
2,879,000
  
$
1,068,000
 

For the three and six months ended June 30, 2016 no shares were granted to directors and employees. For the three and six months ended June 30, 2015 we granted 1,350,000 and 1,360,000 shares, respectively of our common stock to directors and employees.