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Stock-based Compensation Option Activity (Details)
 6 Months Ended
Sep. 30, 2016
$ / shares
shares
Stock-based Compensation Option Activity Details  
Balance at beginning of period | shares 4,793,266
Granted | shares 308,560
Exercised | shares (318,197)
Cancelled/forfeited | shares (1)
Balance at end of period | shares 4,783,628
Options, Vested and expected to vest | shares 4,783,628
Options, Exercisable at end of period | shares 3,085,831
Weighted-average exercise price of options outstanding, at beginning of period | $ / shares $ 6.29
Weighted-average exercise price of options granted during period | $ / shares 14.40
Weighted-average exercise price of options exercised during the period | $ / shares 1.83
Weighted-average exercise price of options forfeited, cancelled or expired during the period | $ / shares 2.58
Weighted-average exercise price of options outstanding at end of period | $ / shares 7.11
Options, Vested and Expected to Vest, Weighted Average Exercise Price | $ / shares 7.11
Weighted-Average Exercise Prices, Exercisable at end of period | $ / shares $ 5.80