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Property and equipment
9 Months Ended
Sep. 30, 2012
Property and equipment [Abstract]  
Property and equipment
6.
Property and equipment
 
Property and equipment consist of the following as of September 30, 2012 and December 31, 2011:
 
   
September 30, 2012
  
December 31, 2011
 
Leasehold improvements
 $990,127  $925,086 
Lab and clean room equipment (a)
  1,760,427   1,463,144 
Furniture and office equipment (a)
  418,210   295,654 
    3,168,764   2,683,884 
Less accumulated depreciation
  (2,168,898)  (1,814,473)
   $999,866  $869,411 

 

(a)  
The table above includes reclassifications of production equipment previously included in the furniture and office equipment category.