Stock-Based Compensation (Summary Of Stock Options Outstanding And Exercisable) (Details) (USD $)			9 Months Ended
	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2012 $0.55 - $1.26	Dec. 31, 2012 $1.27 - $1.72	Dec. 31, 2012 $1.73 - $3.35	Dec. 31, 2012 $3.36 - $5.87	Dec. 31, 2012 $5.88 - $5.89	Dec. 31, 2012 $0.55 - $5.89
Range of Exercise Prices, Minimum			$ 0.55	$ 1.27	$ 1.73	$ 3.36	$ 5.88	$ 0.55
Range of Exercise Prices, Maximum			$ 1.26	$ 1.72	$ 3.35	$ 5.87	$ 5.89	$ 5.89
Options Outstanding, Number of Shares	6,053,715	6,034,335	1,781,500	1,504,919	1,326,608	1,398,688	42,000	6,053,715
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 2.51		$ 1.04	$ 1.53	$ 2.56	$ 5.29	$ 5.89
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)			5.0	2.6	5.6	8.9	9.8
Options Outstanding, Aggregate Intrinsic Value			$ 11,299,025	$ 8,806,130	$ 6,396,028	$ 2,919,012	$ 62,580	$ 29,482,775
Options Exercisable, Number of Shares			1,781,500	1,504,919	886,007	204,018	1,750	4,378,194
Options Exercisable, Weighted-Average Exercise Price Per Share			$ 1.04	$ 1.53	$ 2.43	$ 5.04	$ 5.89
Options Exercisable, Aggregate Intrinsic Value			$ 11,299,025	$ 8,806,130	$ 4,382,974	$ 477,705	$ 2,608	$ 24,968,442