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Convertible Preferred Stock (Details) - USD ($)
 1 Months Ended 2 Months Ended 9 Months Ended 12 Months Ended
May. 31, 2015
Mar. 31, 2015
Feb. 28, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Preferred stock              
Principal amount converted       $ 5,000,000      
Accruals of dividends and accretion to redemption value       24,572,000 $ 2,469,000 $ 3,300,000 $ 2,926,000
Gain on extinguishment for amendment to dividend terms       31,806,000      
6.0% Convertible promissory notes              
Preferred stock              
Principal amount converted   $ 5,000,000          
Series D convertible redeemable preferred stock              
Preferred stock              
Issuance of stock (in shares)   41,666,667          
Aggregate consideration   $ 50,000,000          
Cash consideration from issuance of preferred stock   45,000,000          
Accruals of dividends and accretion to redemption value       $ 24,572,000      
Series A convertible redeemable preferred stock              
Preferred stock              
Dividend rate (as a percent)     4.50%     4.50%  
Accruals of dividends and accretion to redemption value           $ 504,000 970,000
Series B convertible redeemable preferred stock              
Preferred stock              
Dividend rate (as a percent)     8.00%     8.00%  
Accruals of dividends and accretion to redemption value           $ 1,836,000 1,836,000
Series C convertible redeemable preferred stock              
Preferred stock              
Dividend rate (as a percent)     8.00%     8.00%  
Accruals of dividends and accretion to redemption value           $ 960,000 $ 120,000
Series A, Series B and Series C convertible redeemable preferred stock              
Preferred stock              
Accrued dividends     $ 622,000        
Gain on extinguishment for amendment to dividend terms   31,806,000          
Series A, Series B and Series C convertible redeemable preferred stock | Mandatory conversion, initial public offering | Minimum              
Preferred stock              
Gross proceeds from sale of stock   $ 50,000,000          
Redeemable Convertible Preferred Stock | Conversion of redeemable convertible preferred stock into common stock              
Preferred stock              
Number of shares of common stock into which convertible preferred stock was converted 12,591,456            
Redeemable Convertible Preferred Stock | Mandatory conversion, initial public offering | Minimum              
Preferred stock              
Gross proceeds from sale of stock           $ 50,000,000