| | | |||||||
| | 2013 | | 2012 | |||||
| Conversion of convertible debt to common stock | | $ | 523,927 | | | $ | 924,904 | |
| Preferred dividends paid by issuance of stock | | | — | | | | 82,500 | |
| Business combination: | | | | | | | | |
| Issuance of Series E liability | | | — | | | | 18,955,742 | |
| Issuance of contingent consideration | | | — | | | | 11,109,020 | |
| Issuance of replacement warrants | | | — | | | | 1,883,751 | |
| Common stock issued in satisfaction of subscription receivable | | | — | | | | 2,790,107 | |
| Effect of cancellation of escrowed shares | | | — | | | | 195,132 | |
| Obligation to issue shares for professional services | | | — | | | | 30,000 | |
| Effect of modification of convertible debt | | | 151,032 | | | | — | |
| Common Stock issued for committed equity financing facility | | | 204,015 | | | | — | |
| Warrants issued for term loan modification | | | 151,758 | | | | — | |
| Warrants issued for term loan | | | 568,324 | | | | — | |
| Common stock and warrants issued for release of security interest in patents | | | 325,693 | | | | — | |
| Warrants issued in connection with convertible debt | | | 1,353,842 | | | | — | |
| Derivative liability for embedded conversion option | | | 965,484 | | | | — | |
| Common stock issued for professional services | | | 17,850 | | | | — | |
| Common stock issued for settlement of contingency | | | 39,150 | | | | — | |