Stock-based Compensation Option Activity (Details)	9 Months Ended
	Dec. 31, 2016 $ / shares shares
Stock-based Compensation Option Activity Details
Balance at beginning of period | shares	4,793,266
Granted | shares	358,832
Exercised | shares	(338,781)
Cancelled/forfeited | shares	(42,469)
Balance at end of period | shares	4,770,848
Options, Vested and expected to vest | shares	4,770,848
Options, Exercisable at end of period | shares	3,265,483
Weighted-average exercise price of options outstanding, at beginning of period | $ / shares	$ 6.29
Weighted-average exercise price of options granted during period | $ / shares	14.54
Weighted-average exercise price of options exercised during the period | $ / shares	2.17
Weighted-average exercise price of options forfeited, cancelled or expired during the period | $ / shares	9.87
Weighted-average exercise price of options outstanding at end of period | $ / shares	7.17
Options, Vested and Expected to Vest, Weighted Average Exercise Price | $ / shares	7.17
Weighted-Average Exercise Prices, Exercisable at end of period | $ / shares	$ 5.99