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 6 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2013
Jul. 31, 2012
Numerator        
Net loss $ (7,787) $ (5,415) $ (36,374) $ (25,643)
Denominator        
Weighted-average common shares outstanding used in computing basic and diluted net loss per share (in shares) 175,343 167,429 174,476 166,428
Net loss per share, basic (in dollars per share) $ (0.04) $ (0.03) $ (0.21) $ (0.15)
Anti-dilutive securities        
Potential common shares outstanding that were excluded from the computation of diluted net loss per share     33,721 34,028
Options to purchase common stock
        
Anti-dilutive securities        
Potential common shares outstanding that were excluded from the computation of diluted net loss per share     23,920 30,437
Restricted stock units
        
Anti-dilutive securities        
Potential common shares outstanding that were excluded from the computation of diluted net loss per share     9,801 3,591