Commitments (Tables)
 12 Months Ended
Dec. 31, 2012
Commitments [Abstract]  
Schedule of future minimum payments under non-cancelable operating leases
 
Year
    
Amount
  
         
2013
    
$ 
388,128
  
2014
      
352,769
  
2015
      
74,373
  
2016
      
-
  
2017 and thereafter
      
-
  
Total
    
$
815,270