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Stock Incentive Plans - Summary of Stock Option Activity (Details) - Employee Stock Option - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Number of Shares, Outstanding, beginning balance 709,136  
Number of stock options, granted 849,791  
Number of Shares, Options exercised (47,648)  
Number of Shares, Options canceled (103,813)  
Number of Shares, Outstanding ending balance 1,407,466 709,136
Number of Shares, Vested and expected to vest 1,407,466  
Number of Shares, Vested 417,594  
Number of Shares, Exercisable 1,116,205  
Weighted Average Exercise Price, Outstanding, beginning balance $ 2.29  
Weighted Average Exercise Price, Options granted 8.22  
Weighted Average Exercise Price, Options exercised 2.44  
Weighted Average Exercise Price, Options canceled 2.58  
Weighted Average Exercise Price, Outstanding, ending balance 5.85 $ 2.29
Weighted Average Exercise Price, Vested and expected to vest 5.85  
Weighted Average Exercise Price, Vested 4.06  
Weighted Average Exercise Price, Exercisable $ 5.11  
Weighted Average Remaining Contractual Life in Years, Outstanding 9 years 15 days 9 years 8 months 23 days
Weighted Average Remaining Contractual Life in Years, Vested and expected to vest 9 years 15 days  
Weighted Average Remaining Contractual Life in Years, Vested 8 years 5 months 16 days  
Weighted Average Remaining Contractual Life in Years, Exercisable 8 years 11 months 27 days  
Total Aggregate Intrinsic Value, Outstanding, beginning balance $ 2,522  
Total Aggregate Intrinsic Value, Outstanding, ending balance 9,898 $ 2,522
Total Aggregate Intrinsic Value, Vested and expected to vest 9,898  
Total Aggregate Intrinsic Value, Vested 3,649  
Total Aggregate Intrinsic Value, Exercisable $ 8,522