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Stock Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2015
Stock Based Compensation [Abstract]  
Summarization of stock-based compensation
The following table summarizes stock-based compensation for the three and six months ended June 30, 2015 and 2014:

 
Three months ended
June 30,
 
Six months ended
June 30,
 
 
2015
 
2014
 
2015
 
2014
 
Research and development
 
$
86,000
  
$
18,000
  
$
104,000
  
$
95,000
 
Selling, general and administrative
  
818,000
   
174,000
   
1,024,000
   
892,000
 
Stock-based compensation expense included in operating expense
 
$
904,000
  
$
192,000
  
$
1,128,000
  
$
987,000