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Stock Based Compensation (Tables)
3 Months Ended
Mar. 31, 2014
Stock Based Compensation [Abstract]  
Summarization of stock-based compensation
The following table summarizes stock-based compensation for the three months ended March 31, 2014 and 2013:
 
Three months ended
March 31,
 
 
2014
 
2013
 
Research and development
 
$
5,000
  
$
9,000
 
Selling, general and administrative
  
59,000
   
68,000
 
Stock-based compensation expense
   included in operating expense
 
$
64,000
  
$
77,000