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Net Income (Loss) Per Share (Tables)
 9 Months Ended
Sep. 30, 2012
Net Income (Loss) Per Share [Abstract]  
Computation of net income (loss) per share basic and diluted
                                 
    Nine months ended September 30,  
    2011     2012  
    Class A     Class B     Class A     Class B  

Numerator:

                                

Net income (loss)

   $ 538     $ 1,433     $ (319 )    $ (543 ) 

Dividends paid to participating securities

     —         (191 )      —         (262 ) 
   

 

 

    

 

 

    

 

 

    

 

 

  

Net income (loss) applicable to common stockholders

   $ 538     $ 1,242     $ (319 )    $ (805 ) 

Denominator:

                                

Weighted average number of shares outstanding used to calculate basic net income (loss) per share

     10,027       23,136       9,576       24,303  
   

 

 

    

 

 

    

 

 

    

 

 

  

Basic net income (loss) per share applicable to common stockholders

   $ 0.05     $ 0.05     $ (0.03 )    $ (0.03 ) 
   
    Three months ended September 30,  
    2011     2012  
    Class A     Class B     Class A     Class B  

Numerator:

                                

Net income (loss)

   $ 349     $ 904     $ (187 )    $ (356 ) 

Dividends paid to participating securities

     —         (66 )      —         (123 ) 
   

 

 

    

 

 

    

 

 

    

 

 

  

Net income (loss) applicable to common stockholders

   $ 349     $ 838     $ (187 )    $ (479 ) 

Denominator:

                                

Weighted average number of shares outstanding used to calculate basic net income (loss) per share

     9,851       23,673       9,570       24,536  
   

 

 

    

 

 

    

 

 

    

 

 

  

Basic net income (loss) per share applicable to common stockholders

   $ 0.04     $ 0.04     $ (0.02 )    $ (0.02 ) 
                                 
    Nine months ended September 30,  
    2011     2012  
    Class A     Class B     Class A     Class B  

Numerator:

                                

Net income (loss)

   $ 507     $ 1,464     $ (319 )    $ (543 ) 

Dividends paid to participating securities

     —         (191 )      —         (262 ) 

Reallocation of net income (loss) for Class A shares as a result of conversion of Class A to Class B shares

     —         507       —         (319 ) 
   

 

 

    

 

 

    

 

 

    

 

 

  

Net income (loss) applicable to common stockholders

   $ 507     $ 1,780     $ (319 )    $ (1,124 ) 
         

Denominator:

                                

Weighted average number of shares outstanding used to calculate basic net income (loss) per share

     10,027       23,136       9,576       24,303  

Weighted average stock options and warrants and common shares subject to repurchase or cancellation

     —         2,017       —         —    

Conversion of Class A to Class B common shares outstanding

     —         10,027       —         9,576  
   

 

 

    

 

 

    

 

 

    

 

 

  

Weighted average number of shares outstanding used to calculate diluted net income (loss) per share

     10,027       35,180       9,576       33,879  
   

 

 

    

 

 

    

 

 

    

 

 

  

Diluted net income (loss) per share applicable to common stockholders

   $ 0.05     $ 0.05     $ (0.03 )    $ (0.03 ) 
   
    Three months ended September 30,  
    2011     2012  
    Class A     Class B     Class A     Class B  

Numerator:

                                

Net income (loss)

   $ 325     $ 928     $ (187 )    $ (356 ) 

Dividends paid to participating securities

     —         (66 )      —         (123 ) 

Reallocation of net income (loss) for Class A shares as a result of conversion of Class A to Class B shares

             325               (187 ) 
   

 

 

    

 

 

    

 

 

    

 

 

  

Net income (loss) applicable to common stockholders

   $ 325     $ 1,187     $ (187 )    $ (666 ) 
         

Denominator:

                                

Weighted average number of shares outstanding used to calculate basic net income (loss) per share

     9,851       23,673       9,570       24,536  

Weighted average stock options and warrants and common shares subject to repurchase or cancellation

     —         2,420       —         —    

Conversion of Class A to Class B common shares outstanding

     —         9,851       —         9,570  
   

 

 

    

 

 

    

 

 

    

 

 

  

Weighted average number of shares outstanding used to calculate diluted net income (loss) per share

     9,851       35,944       9,570       34,106  
   

 

 

    

 

 

    

 

 

    

 

 

  

Diluted net income (loss) per share applicable to common stockholders

   $ 0.03     $ 0.03     $ (0.02 )    $ (0.02 )