Stockholders' Equity Option Activity (Details) - $ / shares	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Stockholders Equity Option Activity Details
Balance at beginning of period	4,793,266	5,327,907	6,002,382
Granted	407,392	723,776	1,110,466
Exercised	(603,998)	(1,162,175)	(1,326,385)
Cancelled/forfeited	(134,248)	(96,242)	(458,556)
Balance at end of period	4,462,412	4,793,266	5,327,907
Options, Vested and expected to vest	4,462,412
Options, Exercisable at end of period	3,191,879
Weighted-average exercise price of options outstanding, at beginning of period	$ 6.29	$ 5.19	$ 4.14
Weighted-average exercise price of options granted during period	14.63	8.63	7.29
Weighted-average exercise price of options exercised during the period	2.34	2.56	1.87
Weighted-average exercise price of options forfeited, cancelled or expired during the period	8.41	8.06	6.06
Weighted-average exercise price of options outstanding at end of period	7.52	$ 6.29	$ 5.19
Options, Vested and Expected to Vest, Weighted Average Exercise Price	7.52
Weighted-Average Exercise Prices, Exercisable at end of period	$ 6.47