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Consolidated Statement of Changes in Stockholders' Equity - USD ($) | Preferred Stock - Class A | Preferred Stock - Class B | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Total
--- | --- | --- | --- | --- | --- | ---
Beginning Balance, Shares at Dec. 31, 2016 | 1,020,000 |  | 7,112,143 |  |  |
Beginning Balance, Amount at Dec. 31, 2016 | $ 1,020 |  | $ 7,112 | $ 86,266,075 | $ (80,716,617) | $ 5,557,590
Consulting fees paid in stock - non-cash payment of accrued expenses, Shares |  |  | 102,975 |  |  |
Consulting fees paid in stock - non-cash payment of accrued expenses, Amount |  |  | $ 103 | 121,617 |  | 121,720
Shares issued - registered offerings - net of offering costs, Shares |  |  | 5,236,001 |  |  |
Shares issued - registered offerings - net of offering costs, Amount |  |  | $ 5,236 | 6,021,828 |  | 6,027,064
Cashless exercise of stock warrants, Shares |  |  | 286,584 |  |  |
Cashless exercise of stock warrants, Amount |  |  | $ 287 | (287) |  |
Stock-based compensation |  |  |  | 1,193,306 |  | 1,193,306
Net loss |  |  |  |  | (7,104,897) | (7,104,897)
Ending Balance, Shares at Dec. 31, 2017 | 1,020,000 |  | 12,737,703 |  |  |
Ending Balance, Amount at Dec. 31, 2017 | $ 1,020 |  | $ 12,738 | 93,602,539 | (87,821,514) | 5,794,783
Cashless exercise of stock warrants, Shares |  |  | 496,644 |  |  |
Cashless exercise of stock warrants, Amount |  |  | $ 496 | (496) |  |
Stock-based compensation |  |  |  | 2,379,905 |  | 2,379,905
Issuance of Preferred stock, Shares |  | 2,666,667 |  |  |  |
Issuance of Preferred stock, Amount |  | $ 2,667 |  | 3,897,334 |  | 3,900,001
Conversion of Preferred Shares to Common Shares, Shares | (206,376) |  | 235,413 |  |  |
Conversion of Preferred Shares to Common Shares, Amount | $ (206) |  | $ 236 | (30) |  |
Shares issued payment of Series A PS dividend, Shares |  |  | 729 |  |  |
Shares issued payment of Series A PS dividend, Amount | $ (1) |  | $ 1 |  |  |
Shares issued - equity line, Shares |  |  | 579,961 |  |  |
Shares issued - equity line, Amount |  |  | $ 580 | 711,648 |  | 712,228
Shares issued - registered ATM offering - net of offering costs, Shares |  |  | 18,811,640 |  |  |
Shares issued - registered ATM offering - net of offering costs, Amount |  |  | $ 18,812 | 28,738,774 |  | 28,757,586
Net loss |  |  |  |  | (15,676,108) | (15,676,108)
Ending Balance, Shares at Dec. 31, 2018 | 813,624 | 2,666,667 | 32,862,090 |  |  |
Ending Balance, Amount at Dec. 31, 2018 | $ 813 | $ 2,667 | $ 32,863 | $ 129,329,674 | $ (103,497,622) | $ 25,868,395

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