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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Assets    
Cash $ 16,466 $ 12,303
Marketable securities 52,048  
Liabilities    
Warrant liability   1,945
Cash
   
Assets    
Cash 2,135 2,710
Money market
   
Assets    
Cash 14,331 9,593
Domestic corporate debt securities | Domestic corporate debt securities
   
Assets    
Marketable securities 43,548  
Domestic corporate commercial paper | Domestic corporate commercial paper
   
Assets    
Marketable securities 8,500  
Level 1
   
Assets    
Cash 16,466 2,710
Money Market Funds   9,593
Assets fair value   12,303
Level 1 | Cash
   
Assets    
Cash 2,135  
Level 1 | Money market
   
Assets    
Cash 14,331  
Level 2
   
Assets    
Marketable securities 52,048  
Level 2 | Domestic corporate debt securities | Domestic corporate debt securities
   
Assets    
Marketable securities 43,548  
Level 2 | Domestic corporate commercial paper | Domestic corporate commercial paper
   
Assets    
Marketable securities 8,500  
Significant unobservable inputs
   
Liabilities    
Warrant liability   1,945
Stock liability   5,328
Total liabilities carried at fair value   7,273
Recurring basis
   
Assets    
Cash   2,710
Money Market Funds   9,593
Assets fair value   12,303
Liabilities    
Warrant liability   1,945
Stock liability   5,328
Total liabilities carried at fair value   $ 7,273