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Net loss per share
 9 Months Ended
Oct. 31, 2012
Net loss per share [Abstract]  
Net loss per share

Note 9. Net loss per share

Basic net loss per share attributable to common stockholders is computed by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period. Diluted net loss per share is computed by giving effect to all potential shares of common stock, including our redeemable convertible preferred stock, our convertible preferred stock, outstanding stock options, outstanding warrants, stock related to unvested early exercised stock options and stock related to unvested restricted stock awards to the extent dilutive. Basic and diluted net loss per share were the same for each period presented as the inclusion of all potential common shares outstanding would have been anti-dilutive.

The net loss per share attributable to common stockholders is allocated based on the contractual participation rights of the Class A and Class B common shares as if the loss for the year has been distributed. As the liquidation and dividend rights are identical, the net loss attributable to common stockholders is allocated on a proportionate basis.

We consider shares issued upon the early exercise of options subject to repurchase and unvested restricted stock awards to be participating securities because holders of such shares have non-forfeitable dividend rights in the event of our declaration of a dividend for common shares. In future periods to the extent we are profitable, we will subtract earnings allocated to these participating securities from net income to determine net income attributable to common stockholders.

The following table presents the calculation of basic and diluted net loss attributable to common stockholders per share (in thousands, except per share data):

 

                                                                 
    Three Months Ended
October 31,		     Nine Months Ended
October 31,		  
    2012     2011     2012     2011  
    Class A     Class B     Class A     Class B     Class A     Class B     Class A     Class B  

Basic and diluted net loss attributable to Class A and Class B common stockholders per share:

                                                                

Numerator:

                                                                

Allocation of distributed net loss attributable to common stockholders

   $ (3,807 )    $ (37,664 )    $ —       $ (19,803 )    $ (3,939 )    $ (84,875 )    $ —       $ (56,128 ) 

Denominator:

                                                                

Weighted-average common shares outstanding

     5,688       56,272       —         29,779       1,910       41,143       —         29,013  

Basic and diluted net loss per share

   $ (0.67 )    $ (0.67 )    $ —       $ (0.66 )    $ (2.06 )    $ (2.06 )    $ —       $ (1.93 ) 

The anti-dilutive securities excluded from the weighted-average shares used to calculate the diluted net loss per common share were as follows (in thousands):

 

                 
    As of October 31,  
    2012     2011  

Shares subject to outstanding common stock options and warrants

     31,137       29,914  

Shares subject to repurchase

     4,338       2,879  

Shares subject to unvested restricted stock awards

     1,340       100  

Redeemable convertible preferred stock

     —         29,365  

Convertible preferred stock

     —         67,586  
   

 

 

    

 

 

  
      36,815       129,844