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Stock Based Compensation (Tables)
3 Months Ended
Mar. 31, 2015
Stock Based Compensation [Abstract]  
Summarization of stock-based compensation
The following table summarizes stock-based compensation for the three months ended March 31, 2015 and 2014:
 
  
Three months ended
March31,
 
  
2015
  
2014
 
Research and development
 
$
18,000
  
$
77,000
 
General and administrative
  
206,000
   
718,000
 
Stock-based compensation expense included in operating expense
 
$
224,000
  
$
795,000