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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, 2018 |  | 32,381,290 |  |  |
Beginning balance at Dec. 31, 2018 | $ 12,946,015 | $ 32,759 | $ 138,867,509 | $ (124,557,694) | $ (1,396,559)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net loss | (2,462,393) |  |  | (2,462,393) |
Stock-based compensation | 96,871 |  | 96,871 |  |
Stock issued for vested restricted stock awards (in shares) |  | 186,031 |  |  |
Stock issued for vested restricted stock awards | 0 | $ 186 | (186) |  |
Ending balance (in shares) at Mar. 31, 2019 |  | 32,567,321 |  |  |
Ending balance at Mar. 31, 2019 | 10,580,493 | $ 32,945 | 138,964,194 | (127,020,087) | (1,396,559)
Beginning balance (in shares) at Dec. 31, 2018 |  | 32,381,290 |  |  |
Beginning balance at Dec. 31, 2018 | 12,946,015 | $ 32,759 | 138,867,509 | (124,557,694) | (1,396,559)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net loss | (4,417,386) |  |  |  |
Ending balance (in shares) at Jun. 30, 2019 |  | 32,614,534 |  |  |
Ending balance at Jun. 30, 2019 | 8,666,277 | $ 32,992 | 139,004,924 | (128,975,080) | (1,396,559)
Beginning balance (in shares) at Mar. 31, 2019 |  | 32,567,321 |  |  |
Beginning balance at Mar. 31, 2019 | 10,580,493 | $ 32,945 | 138,964,194 | (127,020,087) | (1,396,559)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net loss | (1,954,993) |  |  | (1,954,993) |
Stock-based compensation | 49,822 |  | 49,822 |  |
Stock issued for vested restricted stock awards (in shares) |  | 47,213 |  |  |
Stock issued for vested restricted stock awards | 0 | $ 47 | (47) |  |
Shares withheld for taxes on vest restricted stock | (9,045) |  | (9,045) |  |
Ending balance (in shares) at Jun. 30, 2019 |  | 32,614,534 |  |  |
Ending balance at Jun. 30, 2019 | 8,666,277 | $ 32,992 | 139,004,924 | (128,975,080) | (1,396,559)
Beginning balance (in shares) at Dec. 31, 2019 |  | 51,846,011 |  |  |
Beginning balance at Dec. 31, 2019 | 14,453,550 | $ 52,223 | 144,843,687 | (129,045,801) | (1,396,559)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net loss | (2,825,236) |  |  | (2,825,236) |
Stock-based compensation | 208,897 |  | 208,897 |  |
Stock issued for vested restricted stock awards (in shares) |  | 260,719 |  |  |
Stock issued for vested restricted stock awards | 0 | $ 261 | (261) |  |
Shares withheld for taxes on vest restricted stock | (21,184) |  | (21,184) |  |
Convertible Note Conversion (in shares) |  | 1,200,000 |  |  |
Convertible Note Conversion | 468,667 | $ 1,200 | 467,467 |  |
Sale of common stock, net (in shares) |  | 7,046,429 |  |  |
Sale of common stock, net | 1,206,788 | $ 7,046 | 1,199,742 |  |
Ending balance (in shares) at Mar. 31, 2020 |  | 60,353,159 |  |  |
Ending balance at Mar. 31, 2020 | 13,491,482 | $ 60,730 | 146,698,348 | (131,871,037) | (1,396,559)
Beginning balance (in shares) at Dec. 31, 2019 |  | 51,846,011 |  |  |
Beginning balance at Dec. 31, 2019 | 14,453,550 | $ 52,223 | 144,843,687 | (129,045,801) | (1,396,559)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net loss | (4,184,524) |  |  | (4,184,524) |
Ending balance (in shares) at Jun. 30, 2020 |  | 75,775,666 |  |  |
Ending balance at Jun. 30, 2020 | 18,074,532 | $ 76,153 | 152,625,263 | (133,230,325) | (1,396,559)
Beginning balance (in shares) at Mar. 31, 2020 |  | 60,353,159 |  |  |
Beginning balance at Mar. 31, 2020 | 13,491,482 | $ 60,730 | 146,698,348 | (131,871,037) | (1,396,559)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net loss | (1,359,288) |  |  | (1,359,288) |
Stock-based compensation | 193,288 |  | 193,288 |  |
Convertible Note Conversion (in shares) |  | 1,800,000 |  |  |
Convertible Note Conversion | 455,143 | $ 1,800 | 453,343 |  |
Sale of common stock, net (in shares) |  | 13,622,507 |  |  |
Sale of common stock, net | 5,293,907 | $ 13,623 | 5,280,284 |  |
Ending balance (in shares) at Jun. 30, 2020 |  | 75,775,666 |  |  |
Ending balance at Jun. 30, 2020 | $ 18,074,532 | $ 76,153 | $ 152,625,263 | $ (133,230,325) | $ (1,396,559)

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