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

  
Three months ended
September 30,
  
Nine months ended
September 30,
 
  
2015
  
2014
  
2015
  
2014
 
Research and development
 
$
142,000
  
$
18,000
  
$
246,000
  
$
113,000
 
General and administrative
  
1,310,000
   
154,000
   
2,334,000
   
1,046,000
 
Stock-based compensation expense included in operating expense
 
$
1,452,000
  
$
172,000
  
$
2,580,000
  
$
1,159,000