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 |