Stock-based Compenstaion Stock Options Outstanding And Exercisable (Details) - USD ($)	9 Months Ended
	Dec. 31, 2016	Mar. 31, 2016
Options Outstanding, Number of Shares	4,770,848	4,793,266
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 7.17	$ 6.29
Options Exercisable, Number of Shares	3,265,483
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 5.99
$0.55 - $4.26
Range of Exercise Prices, Minimum	0.55
Range of Exercise Prices, Maximum	$ 4.26
Options Outstanding, Number of Shares	991,768
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 1.43
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	1 year 216 days
Options Outstanding, Aggregate Intrinsic Value	$ 12,760,718
Options Exercisable, Number of Shares	991,768
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 1.43
Options Exercisable, Aggregate Intrinsic Value	$ 12,760,718
$4.32 - $6.86
Range of Exercise Prices, Minimum	$ 4.32
Range of Exercise Prices, Maximum	$ 6.86
Options Outstanding, Number of Shares	1,288,863
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 6.26
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	6 years 252 days
Options Outstanding, Aggregate Intrinsic Value	$ 10,368,791
Options Exercisable, Number of Shares	969,263
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 6.06
Options Exercisable, Aggregate Intrinsic Value	$ 7,990,967
$7.52 - $9.21
Range of Exercise Prices, Minimum	$ 7.52
Range of Exercise Prices, Maximum	$ 9.21
Options Outstanding, Number of Shares	1,047,938
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 8.38
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	8 years 36 days
Options Outstanding, Aggregate Intrinsic Value	$ 6,207,461
Options Exercisable, Number of Shares	481,286
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 8.44
Options Exercisable, Aggregate Intrinsic Value	$ 2,821,376
$9.35 - $10.97
Range of Exercise Prices, Minimum	$ 9.35
Range of Exercise Prices, Maximum	$ 10.97
Options Outstanding, Number of Shares	1,017,107
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 9.86
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	6 years 324 days
Options Outstanding, Aggregate Intrinsic Value	$ 4,517,121
Options Exercisable, Number of Shares	759,962
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 9.80
Options Exercisable, Aggregate Intrinsic Value	$ 3,418,142
$11.26 - $15.40
Range of Exercise Prices, Minimum	$ 11.26
Range of Exercise Prices, Maximum	$ 15.40
Options Outstanding, Number of Shares	425,172
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 13.95
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	9 years 72 days
Options Outstanding, Aggregate Intrinsic Value	$ 389,388
Options Exercisable, Number of Shares	63,204
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 11.96
Options Exercisable, Aggregate Intrinsic Value	$ 156,748
$0.55 - $15.40
Range of Exercise Prices, Minimum	$ 0.55
Range of Exercise Prices, Maximum	$ 15.40
Options Outstanding, Number of Shares	4,770,848
Options Outstanding, Aggregate Intrinsic Value	$ 34,243,479
Options Exercisable, Number of Shares	3,265,483
Options Exercisable, Aggregate Intrinsic Value	$ 27,147,951