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Equipment
12 Months Ended
Dec. 31, 2012
Equipment [Abstract]  
Equipment
4. Equipment:

Equipment consists of the following:

 

                 
    December 31,  
    2012     2011  

Office and laboratory equipment

  $ 4,366,797     $ 5,426,183  

Less accumulated depreciation

    (1,531,090     (2,138,075
   

 

 

   

 

 

 
    $ 2,835,707     $ 3,288,108  
   

 

 

   

 

 

 

Depreciation expense for years ended December 31, 2012, 2011 and 2010 was approximately $466,000, $445,000 and $422,000, respectively.