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Stock Based Compensation (Details) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Stock-based compensation [Line Items]    
Stock-based compensation expense included in operating expense $ 64,000 $ 77,000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock issued to employees 0 29,000
Stock options [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options granted (in shares) 10,500,000 0
Research and development [Member]
   
Stock-based compensation [Line Items]    
Stock-based compensation expense included in operating expense 5,000 9,000
Selling, general and administrative [Member]
   
Stock-based compensation [Line Items]    
Stock-based compensation expense included in operating expense $ 59,000 $ 68,000