Net Income Per Common Share Data (Tables)
 6 Months Ended
Jun. 30, 2012
Net Income Per Common Share Data [Abstract]  
Schedule of basic and diluted net income per share
                                 
    Three Months Ended,
June 30,		     Six Months Ended,
June 30,		  
    2011     2012     2011     2012  

Net income

   $ 592     $ 1,199     $ 703     $ 2,373  

Less: undistributed earnings allocated to preferred stockholders

     (541 )      —         (642 )      —    
   

 

 

    

 

 

    

 

 

    

 

 

  

Net income attributable to common stockholders

   $ 51     $ 1,199     $ 61     $ 2,373  
   

 

 

    

 

 

    

 

 

    

 

 

  

Weighted-average common shares used to compute net income per share attributable to common stockholders

     1,974,991       27,212,105       1,952,574       21,907,842  
   

 

 

    

 

 

    

 

 

    

 

 

  

Basic net income per share attributable to common stockholders

   $ 0.03     $ 0.04     $ 0.03     $ 0.11  
   

 

 

    

 

 

    

 

 

    

 

 

  

Diluted net income per share attributable to common stockholders:

                                

Net income

   $ 51     $ 1,199     $ 61     $ 2,373  

Add: Undistributed earnings allocated to preferred stockholders

     541       —         642       —    
   

 

 

    

 

 

    

 

 

    

 

 

  

Net income attributable to common stockholders

   $ 592     $ 1,199     $ 703     $ 2,373  
   

 

 

    

 

 

    

 

 

    

 

 

  

Number of shares used in basic calculation

     1,974,991       27,212,105       1,952,574       21,907,842  

Weighted-average effect of dilutive securities

                                

Add:

                                

Conversion of preferred stock (as-if converted basis)

     17,395,136       —         17,395,136       3,918,684  

Stock options

     3,083,681       2,380,003       3,040,112       2,435,356  
   

 

 

    

 

 

    

 

 

    

 

 

  

Number of shares used in diluted calculation

     22,453,808       29,592,108       22,387,822       28,261,882  
   

 

 

    

 

 

    

 

 

    

 

 

  

Diluted net income per share attributable to common stockholders

   $ 0.03     $ 0.04     $ 0.03     $ 0.08  
   

 

 

    

 

 

    

 

 

    

 

 

  
Schedule of equivalent shares that were excluded from the calculation of diluted net income per share because their effect would have been anti-dilutive
                                 
    Three Months Ended
June 30,		     Six Months Ended
June 30,		  
    2011     2012     2011     2012  

Antidilutive equity awards

                                

Stock options

     267       86,500       58,767       86,500