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, 2013
Oct. 31, 2012
Oct. 31, 2013
Oct. 31, 2012
Numerator        
Net income (loss) $ (1,700) $ 2,052 $ (38,074) $ (23,591)
Denominator        
Weighted-average common shares outstanding used in computing basic net income (loss) per share 184,676 169,391 177,913 167,423
Net income (loss) per share, basic $ (0.01) $ 0.01 $ (0.21) $ (0.14)
Effect of dilutive options (in shares)   20,722    
Effect of dilutive restricted stock units (in shares)   165    
Weighted-average common shares outstanding used in computing diluted net income (loss) per share (in shares) 184,676 190,278 177,913 167,423
Net income (loss) per share, diluted (in dollars per share) $ (0.01) $ 0.01 $ (0.21) $ (0.14)
Anti-dilutive securities        
Potential common shares outstanding that were excluded from the computation of diluted net loss per share 34,167 7,283 34,167 33,306
Options to purchase common stock
        
Anti-dilutive securities        
Potential common shares outstanding that were excluded from the computation of diluted net loss per share 23,531 4,442 23,531 29,016
Restricted stock units
        
Anti-dilutive securities        
Potential common shares outstanding that were excluded from the computation of diluted net loss per share 10,636 2,841 10,636 4,290