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Stock-based Compensation (Details 3)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Stock option activity  
Outstanding at beginning of year (in shares) | shares 281,029
Granted (in shares) | shares 1,197,452
Exercised (in shares) | shares (121,729)
Cancelled (in shares) | shares (506)
Outstanding at end of period (in shares) | shares 1,356,246
Exercisable at end of period (in shares) | shares 208,438
Vested and expected to vest at end of period (in shares) | shares 1,341,543
Weighted average exercise price per share  
Outstanding at beginning of year (in dollars per share) | $ / shares $ 0.69
Granted (in dollars per share) | $ / shares 10.47
Exercised (in dollars per share) | $ / shares 3.89
Cancelled (in dollars per share) | $ / shares 2.06
Outstanding at end of period (in dollars per share) | $ / shares 9.04
Exercisable at end of period (in dollars per share) | $ / shares 2.65
Vested and expected to vest at end of period (in dollars per share) | $ / shares $ 9.13
Stock option activity, additional information  
Outstanding at end of period, Weighted-average remaining contractual term 9 years 2 months 12 days
Exercisable at end of period, Weighted-average remaining contractual term 7 years 10 months 24 days
Vested and expected to vest at end of period, weighted-average remaining contractual term 9 years 2 months 12 days
Outstanding at end of period, Aggregate Intrinsic Value | $ $ 17,722
Exercisable at end of period, Aggregate Intrinsic Value | $ 4,056
Vested and expected to vest at end of period, Aggregate Intrinsic Value | $ $ 18,595