v3.20.1

Consolidated Statement of Stockholders' Equity (Deficit) - USD ($) | Total | Common Stock | Series A Preferred Stock | Additional Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 3,511,564 | $ 41,529 | $ 0 | $ 107,760,036 | $ (104,290,001)
Beginning balance (in shares) at Dec. 31, 2017 |  | 41,529,181 | 0 |  |
Issuance of common stock | 16,120,312 | $ 14,614 |  | 16,105,698 |
Issuance of common stock (in shares) |  | 14,614,500 |  |  |
Stock options and warrants exercised | 90,065 | $ 45 |  | 90,020 |
Stock options and warrants exercised (in shares) |  | 44,643 |  |  |
Exchange offer - 2017 Warrants deemed dividend | 0 |  |  | 765,179 | (765,179)
Exchange offer - 2017 Warrants | 0 | $ 1,969 |  | (1,969) |
Exchange offer - 2017 Warrants (in shares) |  | 1,968,736 |  |  |
Conversion of accounts payable | 298,350 | $ 114 |  | 298,236 |
Conversion of accounts payable ( in shares) |  | 113,874 |  |  |
Stock-based compensation | 1,059,582 |  |  | 1,059,582 |
Net loss from operations | (36,502,316) |  |  |  | (36,502,316)
Ending Balance at Dec. 31, 2018 | (15,422,443) | $ 58,271 | $ 0 | 126,076,782 | (141,557,496)
Ending balance (in shares) at Dec. 31, 2018 |  | 58,270,934 | 0 |  |
Issuance of common stock | 5,928,235 | $ 7,184 |  | 5,921,051 |
Issuance of common stock (in shares) |  | 7,183,488 |  |  |
Stock options and warrants exercised | 35,306 | $ 630 |  | 34,676 |
Stock options and warrants exercised (in shares) |  | 630,141 |  |  |
Reclassification of warrants to equity | 857,072 |  |  | 857,072 |
Deemed dividend |  | $ 116 |  | 86,091 | (86,207)
Deemed dividend (in shares) |  | 116,496 |  |  |
Value of warrants issued with Series B Preferred Stock | 6,709,961 |  |  | 6,709,961 |
Value of warrants issued with Convertible Note | 430,000 |  |  | 430,000 |
Common stock issued for preferred stock dividend (in shares) |  | 718,755 |  |  |
Preferred Stock Dividends, Common Stock Issued, Value | 1,166,771 | $ 719 |  | 1,166,052 |
Conversion of 4.5% convertible notes (in shares) |  | 185,186 |  |  |
Conversion of Convertible Note | 564,817 | $ 185 |  | 564,632 |
Stock-based compensation | 1,979,998 |  |  | 1,979,998 |
Net loss from operations | (37,162,827) |  |  |  | (37,162,827)
Ending Balance at Dec. 31, 2019 | $ (34,913,110) | $ 67,105 | $ 0 | $ 143,826,315 | $ (178,806,530)
Ending balance (in shares) at Dec. 31, 2019 |  | 67,105,000 | 0 |  |

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