Annual report pursuant to Section 13 and 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 12 Months Ended
Jan. 31, 2013
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Numerator                      
Net loss                 $ (38,148) $ (16,107) $ (1,764)
Accretion of redeemable convertible preferred stock                   (110) (300)
Increase in cumulative dividends payable upon conversion or liquidation of redeemable convertible preferred stock                   (3,648) (8,978)
Net loss attributable to common stockholders $ (14,557) $ 2,052 $ (5,415) $ (20,228) $ (8,179) $ 638 $ (3,180) $ (9,144) $ (38,148) $ (19,865) $ (11,042)
Denominator                      
Weighted-average common shares outstanding used in computing basic and diluted net loss per share (in shares)                 168,294 105,955 10,761
Net loss per share, basic and diluted $ (0.09) $ 0.01 $ (0.03) $ (0.12) $ (0.05) $ 0.00 $ (0.04) $ (0.61) $ (0.23) $ (0.19) $ (1.03)
Anti-dilutive securities                      
Potential common shares outstanding that were excluded from the computation of diluted net loss per share                 31,615 36,393 171,106
Options to purchase common stock
                      
Anti-dilutive securities                      
Potential common shares outstanding that were excluded from the computation of diluted net loss per share                 26,103 34,811 33,408
Warrants to purchase convertible preferred stock
                      
Anti-dilutive securities                      
Potential common shares outstanding that were excluded from the computation of diluted net loss per share                     403
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                 5,512 1,427  
Convertible preferred stock
                      
Anti-dilutive securities                      
Potential common shares outstanding that were excluded from the computation of diluted net loss per share                     137,295