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Stock-based Compensation (Details) - shares
1 Months Ended 3 Months Ended
Apr. 30, 2015
Mar. 31, 2015
Jul. 31, 2014
Stock options      
Stock-based compensation      
Vesting period   4 years  
Contractual life   10 years  
Stock options | Minimum      
Stock-based compensation      
Period following termination date vested options are exercisable   1 month  
Stock options | Maximum      
Stock-based compensation      
Period following termination date vested options are exercisable   3 months  
2014 Stock Incentive Plan      
Stock-based compensation      
Shares of common stock authorized for issuance 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%