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Significant Accounting Policies - Summary of Changes To Warrant Valuations (Details 3) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Class of Warrant or Right [Line Items]        
Value of warrants at December 31, 2014     $ 2,491  
Value of warrants issued     12,246  
Adjustment for warrants exercised/extinguished     (7,262)  
Changes in fair value, net $ (660) $ (6,789) (6,924) $ (8,204)
Value of warrants at September 30, 2015 551   551  
2013 & 2014 Issuances        
Class of Warrant or Right [Line Items]        
Value of warrants at December 31, 2014     $ 2,491  
Value of warrants issued      
Adjustment for warrants exercised/extinguished     $ (3)  
Changes in fair value, net     (2,153)  
Value of warrants at September 30, 2015 335   $ 335  
2015 Issuances        
Class of Warrant or Right [Line Items]        
Value of warrants at December 31, 2014      
Value of warrants issued     $ 12,246  
Adjustment for warrants exercised/extinguished     (7,259)  
Changes in fair value, net     (4,771)  
Value of warrants at September 30, 2015 $ 216   $ 216