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Net Loss Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Net loss per common share          
Net loss   $ (17,730) $ (14,448) $ (14,448) $ (16,197)
Extinguishment of preferred stock   31,806      
Accretion and dividends of preferred stock       (3,300) (2,925)
Loss attributable to common stockholders - basic and diluted   $ (10,496) $ (16,917) $ (21,217) $ (6,883)
Weighted-average number of common shares used in net loss per share-basic and diluted (in shares)   11,179,756 926,597 926,597 1,697,044
Net loss per share - basic and diluted (in dollars per share)   $ (0.94) $ (18.26) $ (18.26) $ (4.06)
Series A, Series B and Series C convertible redeemable preferred stock          
Net loss per common share          
Extinguishment of preferred stock $ 31,806        
Accretion and dividends of preferred stock   $ (23,327) $ (2,469)    
Series D convertible redeemable preferred stock          
Net loss per common share          
Accretion and dividends of preferred stock   $ (1,245)