Basis of Presentation (Summary Of Stock Options Outstanding And Exercisable) (Details) (USD $)			3 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2014 $0.55 - $1.26	Jun. 30, 2014 $1.27 - $1.79	Jun. 30, 2014 $1.80 - $5.87	Jun. 30, 2014 $5.88 - $9.74	Jun. 30, 2014 $10.97 - $11.26	Jun. 30, 2014 $0.55 - $11.26
Range of Exercise Prices, Minimum			$ 0.55	$ 1.27	$ 1.80	$ 5.88	$ 10.97	$ 0.55
Range of Exercise Prices, Maximum			$ 1.26	$ 1.79	$ 5.87	$ 9.74	$ 11.26	$ 11.26
Options Outstanding, Number of Shares	5,605,386	6,002,382	1,628,745	1,238,578	1,345,025	1,243,038	150,000	5,605,386
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 4.16	$ 4.14	$ 1.04	$ 1.53	$ 4.67	$ 9.49	$ 11.11
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)			3 years 219 days	1 year 256 days	6 years 256 days	9 years 73 days	9 years 183 days
Options Outstanding, Aggregate Intrinsic Value			$ 11,472,489	$ 8,110,169	$ 4,593,163	$ 95,930	$ 0	$ 24,271,751
Options Exercisable, Number of Shares			1,628,745	1,238,578	834,255	93,135	0	3,794,713
Options Exercisable, Weighted-Average Exercise Price Per Share			$ 1.04	$ 1.53	$ 4.24	$ 8.92	$ 0
Options Exercisable, Aggregate Intrinsic Value			$ 11,472,489	$ 8,110,169	$ 3,201,363	$ 40,317	$ 0	$ 22,824,338