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Restructuring Charges and Asset Disposals (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Restructuring Reserves        
Beginning balance     $ 381,940  
Expenses 126,730 2,986,441 495,207 2,986,441
Cash payments     (377,202)  
Non-cash charges     (114,843)  
Ending balance 385,102   385,102  
Severance and benefit costs 2011 [Member]
        
Restructuring Reserves        
Beginning balance     64,132  
Expenses     34,616  
Cash payments     (17,665)  
Non-cash charges     (2,994)  
Ending balance 78,089   78,089  
Lease termination costs 2011 [Member]
        
Restructuring Reserves        
Beginning balance     317,808  
Expenses         
Cash payments         
Non-cash charges     (72,404)  
Ending balance 245,404   245,404  
Severance and benefit costs 2012 [Member]
        
Restructuring Reserves        
Beginning balance         
Expenses     410,813  
Cash payments     (359,537)  
Non-cash charges         
Ending balance 51,276   51,276  
Lease termination costs 2012 [Member]
        
Restructuring Reserves        
Beginning balance         
Expenses     10,333  
Cash payments         
Non-cash charges         
Ending balance 10,333   10,333  
Assets disposals [Member]
        
Restructuring Reserves        
Beginning balance         
Expenses     39,445  
Cash payments         
Non-cash charges     (39,445)  
Ending balance