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Deferred Revenue
12 Months Ended
Dec. 31, 2011
Deferred Revenue [Abstract]  
Deferred Revenue

8. Deferred Revenue

Deferred revenue consists of the following:

 

                 
     December 31,
2011
    December 31,
2010
 

Product shipped, revenue deferred

   $ 2,001,160      $ 552,692   

Customer deposits

     1,156,900        312,154   

Deferred service and license fees

     5,696,959        6,214,317   
                  
       8,855,019        7,079,163   

Less: Long-term deferred revenue

     (634,713     (478,850
                  

Total current deferred revenue

   $ 8,220,306      $ 6,600,313