| Warrants | ||||||||
| Weighted- | ||||||||
| Average | ||||||||
| Warrants | Exercise Price | |||||||
| Outstanding at January 1, 2012 | 2,219,546 | $ | 5.84 | |||||
| Issued | 5,300 | $ | 5.04 | |||||
| Exercised | — | $ | — | |||||
| Expired | (9,166 | ) | $ | 6.30 | ||||
| Conversion to Common Stock | (234,019 | ) | $ | 6.77 | ||||
| Outstanding at January 1, 2013 | 1,981,661 | $ | 5.75 | |||||
| Issued | 2,167,500 | $ | 1.00 | |||||
| Exercised | — | $ | — | |||||
| Expired | (1,191 | ) | $ | 6.30 | ||||
| Anti-dilution additional warrants issued | 132,583 | $ | 6.69 | |||||
| Outstanding at December 31, 2013 | 4,280,553 | $ | 3.17 | |||||