Basis of Presentation (Summary Of Stock Options Outstanding And Exercisable) (Details) (USD $)	9 Months Ended
	Dec. 31, 2014	Mar. 31, 2014
Options Outstanding, Number of Shares	5,561,088	6,002,382
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 5.03	$ 4.14
$0.55 - $1.26
Range of Exercise Prices, Minimum	$ 0.55
Range of Exercise Prices, Maximum	$ 1.26
Options Outstanding, Number of Shares	1,204,815
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 1.10
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	2 years 303 days
Options Outstanding, Aggregate Intrinsic Value	$ 9,702,578
Options Exercisable, Number of Shares	1,204,815
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 1.10
Options Exercisable, Aggregate Intrinsic Value	9,702,578
$1.27 - $2.58
Range of Exercise Prices, Minimum	$ 1.27
Range of Exercise Prices, Maximum	$ 2.58
Options Outstanding, Number of Shares	1,118,397
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 1.61
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	1 year 226 days
Options Outstanding, Aggregate Intrinsic Value	8,444,013
Options Exercisable, Number of Shares	1,113,189
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 1.61
Options Exercisable, Aggregate Intrinsic Value	8,407,885
$2.81 - $6.86
Range of Exercise Prices, Minimum	$ 2.81
Range of Exercise Prices, Maximum	$ 6.86
Options Outstanding, Number of Shares	1,700,263
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 6.03
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	8 years 18 days
Options Outstanding, Aggregate Intrinsic Value	5,326,085
Options Exercisable, Number of Shares	658,248
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 5.35
Options Exercisable, Aggregate Intrinsic Value	2,505,175
$7.52 - $9.74
Range of Exercise Prices, Minimum	$ 7.52
Range of Exercise Prices, Maximum	$ 9.74
Options Outstanding, Number of Shares	1,387,613
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 9.29
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	8 years 277 days
Options Outstanding, Aggregate Intrinsic Value	346,598
Options Exercisable, Number of Shares	368,942
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 9.63
Options Exercisable, Aggregate Intrinsic Value	1,866
$10.97 - $11.26
Range of Exercise Prices, Minimum	$ 10.97
Range of Exercise Prices, Maximum	$ 11.26
Options Outstanding, Number of Shares	150,000
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 11.11
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	9 years 7 days
Options Outstanding, Aggregate Intrinsic Value	0
Options Exercisable, Number of Shares	21,875
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 10.97
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	5,561,088
Options Outstanding, Aggregate Intrinsic Value	23,819,274
Options Exercisable, Number of Shares	3,367,069
Options Exercisable, Aggregate Intrinsic Value	$ 20,617,504