Quarterly report pursuant to Section 13 or 15(d)

Property and equipment (Details)

v2.4.1.9
Property and equipment (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Property and equipment Abstract]      
Depreciation expense $ 40,000us-gaap_Depreciation $ 52,000us-gaap_Depreciation  
Property, Plant and Equipment [Line Items]      
Property and equipment 5,391,044us-gaap_PropertyPlantAndEquipmentGross   5,391,044us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation 3,327,038us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment   3,287,164us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total property and equipment, net 2,064,006us-gaap_PropertyPlantAndEquipmentNet   2,103,880us-gaap_PropertyPlantAndEquipmentNet
Land and improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment 1,107,508us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndLandImprovementsMember
  1,107,508us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndLandImprovementsMember
Building [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment 2,589,231us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
  2,589,231us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
Building improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment 253,526us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
  253,526us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
Laboratory equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment 1,112,480us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherMachineryAndEquipmentMember
  1,112,480us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherMachineryAndEquipmentMember
Office and computer equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment $ 328,299us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
  $ 328,299us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember