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Property and equipment (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Property and equipment $ 5,573,742   $ 5,562,898
Less accumulated depreciation (3,144,953)   (3,078,359)
Total property and equipment, net 2,428,789   2,484,539
Depreciation expense 67,000 94,000  
Land and improvements [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment 1,107,508   1,107,508
Building [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment 2,589,231   2,589,231
Building improvements [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment 252,197   251,049
Laboratory equipment [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment 1,212,668   1,211,418
Office and computer equipment [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment $ 412,138   $ 403,692