Stock-based Compensation Option Activity (Details)	6 Months Ended
	Sep. 30, 2015 $ / shares shares
Stock-based Compensation Option Activity Details
Balance at beginning of period | shares	5,327,907
Granted | shares	640,504
Exercised | shares	(429,924)
Cancelled/forfeited | shares	(8,167)
Balance at end of period | shares	5,530,320
Options, Vested and expected to vest | shares	5,530,320
Options, Exercisable at end of period | shares	3,166,470
Weighted-average exercise price of options outstanding, at beginning of period	$ 5.19
Weighted-average exercise price of options granted during period	8.36
Weighted-average exercise price of options exercised during the period	2.06
Weighted-average exercise price of options forfeited, cancelled or expired during the period	6.78
Weighted-average exercise price of options outstanding at end of period	5.80
Options, Vested and Expected to Vest, Weighted Average Exercise Price	5.80
Weighted-Average Exercise Prices, Exercisable at end of period	$ 4.02