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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
Jun. 30, 2012
Jun. 30, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive shares excluded from calculation of diluted EPS 6,300,000  
Net loss $ (10,275) $ (37,679)
Weighted-average shares of common stock outstanding 51,997,000 51,172,000
Weighted-average shares subject to repurchase (806,000) (463,000)
Shares used in per-share calculation basic 51,191,000 50,709,000
Shares used in per-share calculation diluted 51,191,000 50,709,000
Net loss per share basic $ (0.20) $ (0.74)
Net loss per share diluted $ (0.20) $ (0.74)
Unvested Options [Member]
    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive shares excluded from calculation of diluted EPS 3,100,000 3,000,000
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