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Nature Of The Business And Operations (Details) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended
Jun. 05, 2012
Apr. 04, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Cash, cash equivalents, and marketable securities       $ 51,600,000               $ 51,600,000    
Net (loss) income       (21,168,000) (26,271,000) (51,709,000) (37,679,000) (185,135,000) (18,158,000) 7,839,000 9,170,000 (136,827,000) (186,284,000) 16,248,000
Cash used for operations                       (141,042,000) (22,821,000) 40,680,000
Reduction in global workforce, percentage                       50.00%    
Number of workforce persons, minimum         400                  
Adverse purchase commitments for inventory       25,894,000       38,763,000       25,894,000 38,763,000  
Change in restricted cash     8,500,000                 9,093,000 (247,000) (1,602,000)
Reduction of adverse purchase commitments liability     7,400,000                      
Borrowing capacity     9,000,000                      
Convertible debt, carrying value   25,000,000                        
Convertible debt, effective interest rate   7.00%                        
Borrowed amount 10,000,000                          
Unrestricted cash balance, minimum 10,000,000                          
Letter of Credit [Member]
                            
Change in restricted cash     8,500,000                      
Reduction of adverse purchase commitments liability     7,400,000                      
Borrowing capacity     $ 9,000,000