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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Property and equipment Abstract]          
Depreciation expense $ 38,000 $ 51,000 $ 78,000 $ 103,000  
Property, Plant and Equipment [Line Items]          
Property and equipment 5,391,044   5,391,044   $ 5,391,044
Less accumulated depreciation 3,364,679   3,364,679   3,287,164
Total property and equipment, net 2,026,365   2,026,365   2,103,880
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 1,112,480   1,112,480   1,112,480
Office and computer equipment [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment $ 328,299   $ 328,299   $ 328,299