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Stockholders' Equity (Summary Of Employee And Non-Employee Stock Options Activity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2011
Stockholders' Equity [Abstract]    
Options/Shares, Outstanding at March 31, 2012 2,290,416  
Options/Shares, Granted at fair value 857,450  
Options/Shares, Exercised (480)  
Options/Shares, Cancelled/Forfeited (476,192)  
Options/Shares, Outstanding at March 31, 2013 2,671,194  
Options/Shares, Exercisable at March 31, 2013 1,443,185  
Options/Shares, Fully vested and expected to vest at March 31, 2013 2,577,218  
Weighted-Average Exercise Price, Outstanding at March 31, 2012 $ 17.77  
Weighted-Average Exercise Price, Granted at fair value $ 4.09  
Weighted-Average Exercise Price, Exercised $ 3.44  
Weighted-Average Exercise Price, Cancelled/Forfeited $ 15.57  
Weighted-Average Exercise Price, Outstanding at March 31, 2013 $ 13.77  
Weighted-Average Exercise Price, Exerciseable at March 31, 2013 $ 16.65  
Weighted-Average Exercise Price, Fully vested and expected to vest at March 31, 2013 $ 13.88  
Weighted-Average Remaining Contractual Term, Outstanding at March 31, 2013 6 years 4 months 24 days  
Weighted-Average Remaining Contractual Term, Exerciseable at March 31, 2013 4 years 7 months 6 days  
Weighted-Average Remaining Contractual Term, Fully vested and expected to vest at March 31, 2013 6 years 3 months 18 days  
Aggregate Intrinsic Value, Outstanding at March 31, 2013 $ 0  
Aggregate Intrinsic Value, Exerciseable at March 31, 2013 0 8,700
Aggregate Intrinsic Value, Fully vested and expected to vest at March 31, 2013 $ 0