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, 2012
Jul. 31, 2011
Jul. 31, 2012
Jul. 31, 2011
Numerator        
Net loss $ (5,415) $ (1,812) $ (25,643) $ (8,566)
Accretion of redeemable convertible preferred stock   (40)   (110)
Increase in cumulative dividends payable upon conversion or liquidation of redeemable convertible preferred stock   (1,328)   (3,648)
Net loss attributable to common stockholders $ (5,415) $ (3,180) $ (25,643) $ (12,324)
Denominator        
Weighted-average common shares outstanding used in computing basic net loss per share (in shares) 167,429 82,389 166,428 49,204
Weighted-average common shares outstanding used in computing diluted net loss per share (in shares) 167,429 82,389 166,428 49,204
Net loss per share, basic (in dollars per share) $ (0.03) $ (0.04) $ (0.15) $ (0.25)
Net loss per share, diluted (in dollars per share) $ (0.03) $ (0.04) $ (0.15) $ (0.25)
Anti-dilutive securities        
Potential common shares outstanding that were excluded from the computation of diluted net loss per share     34,028 37,049
Options to purchase common stock
        
Anti-dilutive securities        
Potential common shares outstanding that were excluded from the computation of diluted net loss per share     30,437 36,894
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     3,591