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Computation of Net (Loss) Income Per Common Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Mar. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Anti-dilutive shares excluded from calculation of diluted EPS 8,800,000   8,800,000    
Net loss $ (15,949) $ (51,709) $ (26,224) $ (89,388) $ 136,800
Weighted-average shares of common stock outstanding 52,606,000 51,232,000 52,202,000 51,090,000  
Weighted-average shares subject to repurchase (699,000) (356,000) (651,000) (374,000)  
Shares used in per-share calculation basic 51,907,000 50,876,000 51,551,000 50,716,000  
Shares used in per-share calculation diluted 51,907,000 50,876,000 51,551,000 50,716,000  
Net loss per share basic $ (0.31) $ (1.02) $ (0.51) $ (1.76)  
Diluted $ (0.31) $ (1.02) $ (0.51) $ (1.76)  
Unvested Options [Member]
          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Anti-dilutive shares excluded from calculation of diluted EPS 3,000,000 2,600,000 3,000,000 2,600,000  
Warrants [Member]
          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Anti-dilutive shares excluded from calculation of diluted EPS 3,200,000   3,200,000    
Convertible Debt Securities [Member]
          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Anti-dilutive shares excluded from calculation of diluted EPS 2,600,000   2,600,000