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Stock-based Compensation (Details 3) - Mar. 31, 2015 - Stock options - USD ($)
$ / shares in Units, $ in Thousands
Total
Stock option activity  
Outstanding at beginning of year (in shares) 281,029
Granted (in shares) 638,095
Exercised (in shares) (115,559)
Outstanding at end of period (in shares) 803,565
Exercisable at end of period (in shares) 132,057
Vested and expected to vest at end of period (in shares) 778,817
Weighted average exercise price per share  
Outstanding at beginning of year (in dollars per share) $ 0.69
Granted (in dollars per share) 5.73
Exercised (in dollars per share) 3.98
Outstanding at end of period (in dollars per share) 4.23
Exercisable at end of period (in dollars per share) 1.71
Vested and expected to vest at end of period (in dollars per share) $ 4.32
Stock option activity, additional information  
Outstanding at end of period, Weighted-average remaining contractual term 9 years 3 months 18 days
Exercisable at end of period, Weighted-average remaining contractual term 7 years 3 months 18 days
Vested and expected to vest at end of period, weighted-average remaining contractual term 9 years 4 months 24 days
Outstanding at end of period, Aggregate intrinsic value $ 1,761
Exercisable at end of period, Aggregate intrinsic value 621
Vested and expected to vest at end of period, Aggregate intrinsic value $ 1,636