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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) | Series B Preferred Stock | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Treasury Stock | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 2,830,000 | $ 1,505 | $ 27,416,802 | $ (30,269,833) | $ (149,459) | $ (170,985)
Balance, shares at Dec. 31, 2018 | 2,830 | 1,505,883 |  |  |  |
Common stock issued for warrants exercised |  | $ 302 | 2,317,718 |  |  | 2,318,020
Common stock issued for warrants exercised, shares |  | 301,042 |  |  |  |
Common stock issued for cash less warrants exercised |  | $ 10 | (10) |  |  |
Common stock issued for cash less warrants exercised, shares |  | 9,878 |  |  |  |
Stock options granted to employees |  |  | 44,874 |  |  | 44,874
Stock repurchase |  |  |  |  | (7,993) | (7,993)
Stock issuance costs |  |  | (20,000) |  |  | (20,000)
Series B convertible preferred converted to common stock | $ (1,125,000) | $ 161 | 1,124,839 |  |  |
Series B convertible preferred converted to common stock, Shares | (1,125) | 160,713 |  |  |  |
Common stock issued for services |  | $ 4 | 32,913 |  |  | 32,917
Common stock issued for services, shares |  | 4,523 |  |  |  |
Debt discount from warrants issued with promissory note |  |  | 146,779 |  |  | 146,779
Net loss |  |  |  | (2,470,882) |  | (2,470,882)
Balance at Dec. 31, 2019 | $ 1,705,000 | $ 1,982 | 31,063,915 | (32,740,715) | (157,452) | (127,270)
Balance, shares at Dec. 31, 2019 | 1,705 | 1,982,039 |  |  |  |
Common stock issued for cash and warrants |  | $ 1,542 | 9,251,586 |  |  | 9,253,128
Common stock issued for cash and warrants, shares |  | 1,542,188 |  |  |  |
Modification of employee stock options |  |  | 102,800 |  |  | 102,800
Stock options granted to employees |  |  | 351,970 |  |  | 351,970
Stock issuance costs |  |  | (1,001,885) |  |  | (1,001,885)
Common stock issued for services |  | $ 12 | 52,488 |  |  | 52,500
Common stock issued for services, shares |  | 11,112 |  |  |  |
Net loss |  |  |  | (6,747,435) |  | (6,747,435)
Balance at Dec. 31, 2020 | $ 1,705,000 | $ 3,536 | $ 39,820,874 | $ (39,488,150) | $ (157,452) | $ 1,883,808
Balance, shares at Dec. 31, 2020 | 1,705 | 3,535,339 |  |  |  |

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