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Property and Equipment
3 Months Ended
Mar. 31, 2013
Property and equipment [Abstract]  
Property and equipment
5.
Property and Equipment
 
Property and equipment consist of the following as of March 31, 2013 and December 31, 2012:
 
 
March 31, 2013
 
 
December 31, 2012
 
Leasehold improvements
 
$
1,129,488
 
 
$
1,022,230
 
Lab and clean room equipment
 
 
1,887,645
 
 
 
1,887,645
 
Furniture and office equipment
 
 
433,314
 
 
 
431,563
 
Construction in progress
 
 
81,810
 
 
 
10,027
 
 
 
3,532,257
 
 
 
3,351,465
 
Less accumulated depreciation
 
 
(2,378,590
)
 
 
(2,279,840
)
 
$
1,153,667
 
 
$
1,071,625