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Property and Equipment
12 Months Ended
Dec. 31, 2012
Property and Equipment
5. Property and Equipment
 
Property and equipment is stated at cost and consists of the following:
 
   
December 31,
 
   
2012
   
2011
 
Machinery and equipment
  $ 22,863,921     $ 10,429,816  
Furniture and fixtures
    1,274,477       840,350  
Leasehold improvements
    28,195,345       12,421,398  
Construction in progress
    42,270       27,159,066  
  Subtotal
    52,376,013       50,850,630  
Less accumulated depreciation
    (17,263,032 )     (14,380,752 )
  Total
  $ 35,112,981     $ 36,469,878  
 
Depreciation expense was $2,496,749, $1,816,188 and $1,308,713 for the years ended December 31, 2012, 2011 and 2010, respectively.