|
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 | ||
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Building [Member]
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| Property, Plant and Equipment [Line Items] | |||||
| Property and equipment | 2,589,231 | 2,589,231 | 2,589,231 | ||
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Building improvements [Member]
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|||||
| Property, Plant and Equipment [Line Items] | |||||
| Property and equipment | 253,526 | 253,526 | 253,526 | ||
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Laboratory equipment [Member]
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|||||
| Property, Plant and Equipment [Line Items] | |||||
| Property and equipment | 1,096,850 | 1,096,850 | 1,220,735 | ||
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Office and computer equipment [Member]
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| Property, Plant and Equipment [Line Items] | |||||
| Property and equipment | $ 328,299 | $ 328,299 | $ 326,099 | ||