Quarterly report pursuant to Section 13 or 15(d)

Property and equipment (Details)

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Property and equipment (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Property and equipment Abstract]          
Depreciation expense $ 47,000 $ 150,000 $ 59,000 $ 190,000  
Property, Plant and Equipment [Line Items]          
Property and equipment 5,375,414   5,375,414   5,497,099
Less accumulated depreciation 3,243,658   3,243,658   3,230,117
Total property and equipment, net 2,131,756   2,131,756   2,266,982
Land and improvements [Member]
         
Property, Plant and Equipment [Line Items]          
Property and equipment 1,107,508   1,107,508   1,107,508
Building [Member]
         
Property, Plant and Equipment [Line Items]          
Property and equipment 2,589,231   2,589,231   2,589,231
Building improvements [Member]
         
Property, Plant and Equipment [Line Items]          
Property and equipment 253,526   253,526   253,526
Laboratory equipment [Member]
         
Property, Plant and Equipment [Line Items]          
Property and equipment 1,096,850   1,096,850   1,220,735
Office and computer equipment [Member]
         
Property, Plant and Equipment [Line Items]          
Property and equipment $ 328,299   $ 328,299   $ 326,099