Stockholder's Equity Stock Options Outstanding And Exercisable (Details) - USD ($)	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Options Outstanding, Number of Shares	4,793,266	5,327,907	6,002,382	5,991,544
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 6.29	$ 5.19	$ 4.14	$ 2.52
Options Exercisable, Number of Shares	2,950,697
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 4.99
$0.55 - $1.27
Range of Exercise Prices, Minimum	0.55
Range of Exercise Prices, Maximum	$ 1.27
Options Outstanding, Number of Shares	1,079,767
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 1.13
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	1 year 252 days
Options Outstanding, Aggregate Intrinsic Value	$ 9,589,205
Options Exercisable, Number of Shares	1,079,767
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 1.13
Options Exercisable, Aggregate Intrinsic Value	$ 9,589,205
$1.33 - $6.86
Range of Exercise Prices, Minimum	$ 1.33
Range of Exercise Prices, Maximum	$ 6.86
Options Outstanding, Number of Shares	1,500,242
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 5.77
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	7 years
Options Outstanding, Aggregate Intrinsic Value	$ 6,368,920
Options Exercisable, Number of Shares	1,000,701
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 5.27
Options Exercisable, Aggregate Intrinsic Value	$ 4,744,126
$7.52 - $8.93
Range of Exercise Prices, Minimum	$ 7.52
Range of Exercise Prices, Maximum	$ 8.93
Options Outstanding, Number of Shares	996,150
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 8.29
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	9 years 36 days
Options Outstanding, Aggregate Intrinsic Value	$ 1,723,062
Options Exercisable, Number of Shares	184,115
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 8.14
Options Exercisable, Aggregate Intrinsic Value	$ 345,844
$9.21 - $9.74
Range of Exercise Prices, Minimum	$ 9.21
Range of Exercise Prices, Maximum	$ 9.74
Options Outstanding, Number of Shares	983,835
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 9.62
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	7 years 180 days
Options Outstanding, Aggregate Intrinsic Value	$ 384,463
Options Exercisable, Number of Shares	603,302
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 9.63
Options Exercisable, Aggregate Intrinsic Value	$ 232,944
$10.50 - $11.26
Range of Exercise Prices, Minimum	$ 10.50
Range of Exercise Prices, Maximum	$ 11.26
Options Outstanding, Number of Shares	233,272
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 10.95
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	8 years 180 days
Options Outstanding, Aggregate Intrinsic Value	$ 0
Options Exercisable, Number of Shares	82,812
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 11.10
Options Exercisable, Aggregate Intrinsic Value	$ 0
$0.55 - $11.26
Range of Exercise Prices, Minimum	$ 0.55
Range of Exercise Prices, Maximum	$ 11.26
Options Outstanding, Number of Shares	4,793,266
Options Outstanding, Aggregate Intrinsic Value	$ 18,065,650
Options Exercisable, Number of Shares	2,950,697
Options Exercisable, Aggregate Intrinsic Value	$ 14,912,119