Net Income Per Common Share Data (Tables)
 9 Months Ended
Sep. 30, 2012
Net Income Per Common Share Data [Abstract]  
Schedule of basic and diluted net income per share
                                 
    Three Months Ended,
September 30,		     Nine Months Ended,
September 30,		  
    2011     2012     2011     2012  

Net income

   $ 1,485     $ 652     $ 2,188     $ 3,025  

Less: undistributed earnings allocated to preferred stockholders

     (1,292 )      —         (1,903 )      —    
   

 

 

    

 

 

    

 

 

    

 

 

  

Net income attributable to common stockholders

   $ 193     $ 652     $ 285     $ 3,025  
   

 

 

    

 

 

    

 

 

    

 

 

  

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

     2,318,666       27,329,106       2,006,739       23,728,120  
   

 

 

    

 

 

    

 

 

    

 

 

  

Basic net income per share attributable to common stockholders

   $ 0.08     $ 0.02     $ 0.14     $ 0.13  
   

 

 

    

 

 

    

 

 

    

 

 

  

Diluted net income per share attributable to common stockholders:

                                

Net income

   $ 193     $ 652     $ 285     $ 3,025  

Add: Undistributed earnings allocated to preferred stockholders

     1,292       —         1,903       —    
   

 

 

    

 

 

    

 

 

    

 

 

  

Net income attributable to common stockholders

   $ 1,485     $ 652     $ 2,188     $ 3,025  
   

 

 

    

 

 

    

 

 

    

 

 

  

Number of shares used in basic calculation

     2,318,669       27,329,106       2,006,739       23,728,120  

Weighted-average effect of dilutive securities

                                

Add:

                                

Conversion of preferred stock (as-if converted basis)

     17,395,136       —         17,395,136       2,602,923  

Stock options

     2,198,124       2,681,253       3,031,484       2,434,109  
   

 

 

    

 

 

    

 

 

    

 

 

  

Number of shares used in diluted calculation

     21,911,929       30,010,359       22,433,359       28,765,152  
   

 

 

    

 

 

    

 

 

    

 

 

  

Diluted net income per share attributable to common stockholders

   $ 0.07     $ 0.02     $ 0.10     $ 0.11  
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
September 30,		     Nine Months Ended
September 30,		  
     2011     2012     2011     2012  

Antidilutive equity awards

                                

Stock options

     —         132,850       2,054,748       132,850  
   

 

 

    

 

 

    

 

 

    

 

 

  

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