|
Restructuring charges (Details) (USD $)
|
3 Months Ended | 12 Months Ended | |||||
|---|---|---|---|---|---|---|---|
|
Dec. 31, 2013
|
Sep. 30, 2013
|
Jun. 30, 2013
|
Mar. 31, 2013
|
Dec. 31, 2013
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Dec. 31, 2012
|
Dec. 31, 2011
|
|
| Restructuring Charges [Abstract] | |||||||
| Restructuring and related cost, expected expense reduction | $ 6,000,000 | ||||||
| Severance costs | 324,615 | ||||||
| Restructuring costs and asset impairment charges | (188,329) | ||||||
| Restructuring charges | 513,000 | 0 | 0 | 0 | 512,944 | 0 | 0 |
| Payments for restructuring | (206,385) | ||||||
| Accrued severance charges | $ 118,230 | $ 118,230 | |||||