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Stock-based Compensation (Details) - shares
1 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2015
Sep. 30, 2015
Dec. 31, 2014
Jul. 31, 2014
Stock options        
Stock-based compensation        
Vesting period   4 years 4 years  
Contractual life   10 years 10 years  
Stock options | Minimum        
Stock-based compensation        
Period following termination date vested options are exercisable   1 month 1 month  
Stock options | Maximum        
Stock-based compensation        
Period following termination date vested options are exercisable   3 months 3 months  
2014 Stock Incentive Plan        
Stock-based compensation        
Shares of common stock authorized for issuance (in shares) 2,700,000     525,700
Increase in number of authorized shares on the first day of each fiscal year, as a percentage of outstanding common stock (as a percent) 4.00%