Quarterly report pursuant to Section 13 or 15(d)

Net Income (Loss) Per Share (Details)

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Net Income (Loss) Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Numerator        
Net income (loss) $ 2,052 $ 638 $ (23,591) $ (7,928)
Accretion of redeemable convertible preferred stock       (110)
Increase in cumulative dividends payable upon conversion or liquidation of redeemable convertible preferred stock       (3,648)
Net income (loss) attributable to common stockholders $ 2,052 $ 638 $ (23,591) $ (11,686)
Denominator        
Weighted-average common shares outstanding used in computing basic net income (loss) per share 169,391 161,288 167,423 86,976
Net income (loss) per share, basic (in dollars per share) $ 0.01   $ (0.14) $ (0.13)
Effect of dilutive options (in shares) 20,722 29,538    
Effect of dilutive restricted stock units (in shares) 165 42    
Effect of dilutive warrants to purchase common stock (in shares)   146    
Weighted-average common shares outstanding used in computing diluted net income (loss) per share (in shares) 190,278 191,014 167,423 86,976
Net income (loss) per share, diluted (in dollars per share) $ 0.01   $ (0.14) $ (0.13)
Anti-dilutive securities        
Potential common shares outstanding that were excluded from the computation of diluted net loss per share 7,283 2,099 33,306 37,306
Options to purchase common stock
        
Anti-dilutive securities        
Potential common shares outstanding that were excluded from the computation of diluted net loss per share 4,442 1,930 29,016 36,598
Warrants to purchase common stock
        
Anti-dilutive securities        
Potential common shares outstanding that were excluded from the computation of diluted net loss per share       155
Restricted stock units
        
Anti-dilutive securities        
Potential common shares outstanding that were excluded from the computation of diluted net loss per share 2,841 169 4,290 553