Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Share (Details)

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Net Loss Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Numerator    
Net loss $ (28,587) $ (20,228)
Denominator    
Weighted-average common shares outstanding used in computing basic and diluted net income (loss) per share (in shares) 173,579 165,404
Net loss per share, basic (in dollars per share) $ (0.16) $ (0.12)
Anti-dilutive securities    
Potential common shares outstanding that were excluded from the computation of diluted net loss per share (in shares) 34,632 36,563
Options to purchase common stock
    
Anti-dilutive securities    
Potential common shares outstanding that were excluded from the computation of diluted net loss per share (in shares) 25,683 33,228
Restricted stock units
    
Anti-dilutive securities    
Potential common shares outstanding that were excluded from the computation of diluted net loss per share (in shares) 8,949 3,335