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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Property and equipment Abstract]          
Depreciation expense $ 51,000 $ 64,000 $ 103,000 $ 131,000  
Property, Plant and Equipment [Line Items]          
Property and equipment 5,499,299   5,499,299   5,497,099
Less accumulated depreciation 3,332,699   3,332,699   3,230,117
Total property and equipment, net 2,166,600   2,166,600   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 1,220,735   1,220,735   1,220,735
Office and computer equipment [Member]
         
Property, Plant and Equipment [Line Items]          
Property and equipment $ 328,299   $ 328,299   $ 326,099