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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) | Total | Common Stock | Additional Paid in Capital | Accumulated Deficit | Treasury Stock
--- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2017 |  | 28,618,454 |  |  |
Beginning Balance at Dec. 31, 2017 | $ 14,087,342 | $ 28,996 | $ 136,033,967 | $ (120,579,062) | $ (1,396,559)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net loss | (5,890,832) |  |  | (5,890,832) |
Stock-based compensation | 915,469 |  | 915,469 |  |
Stock issued for vested restricted stock awards (in shares) |  | 527,866 |  |  |
Stock issued for vested restricted stock awards | 0 | $ 528 | (528) |  |
Sale of common stock (in shares) |  | 3,289,000 |  |  |
Sale of common stock | 2,000,583 | $ 3,289 | 1,997,294 |  |
Shares withheld for taxes on vested restricted stock | (78,747) |  | (78,747) |  |
Cancellation of common stock (in shares) |  | (54,030) |  |  |
Cancellation of common stock | 0 | $ (54) | 54 |  |
Ending Balance (in shares) at Dec. 31, 2018 |  | 32,381,290 |  |  |
Ending Balance at Dec. 31, 2018 | 11,033,815 | $ 32,759 | 138,867,509 | (126,469,894) | (1,396,559)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net loss | (4,488,107) |  |  | (4,488,107) |
Stock-based compensation | 789,914 |  | 789,914 |  |
Stock issued for vested restricted stock awards (in shares) |  | 765,429 |  |  |
Stock issued for vested restricted stock awards | 0 | $ 765 | (765) |  |
Shares withheld for taxes on vested restricted stock | (45,565) |  | (45,565) |  |
Convertible Note Conversion (in shares) |  | 2,886,792 |  |  |
Convertible Note Conversion | 837,170 | $ 2,887 | 834,283 |  |
Sale of common stock (in shares) |  | 15,812,500 |  |  |
Sale of common stock | 4,414,123 | $ 15,812 | 4,398,311 |  |
Ending Balance (in shares) at Dec. 31, 2019 |  | 51,846,011 |  |  |
Ending Balance at Dec. 31, 2019 | $ 12,541,350 | $ 52,223 | $ 144,843,687 | $ (130,958,001) | $ (1,396,559)

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