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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, 2017 | $ 2,830,000 | $ 1,475 | $ 26,628,006 | $ (28,688,946) | $ (148,000) | $ 622,535
Balance, shares at Dec. 31, 2017 | 2,830 | 1,475,561 |  |  |  |
Common stock issued for warrants exercised |  | $ 21 | 194,979 |  |  | 195,000
Common stock issued for warrants exercised, shares |  | 21,429 |  |  |  |
Stock options granted to employees |  |  | 447,826 |  |  | 447,826
Stock Repurchase |  |  |  |  | (1,459) | (1,459)
Common stock issued for accrued services |  | $ 4 | 73,704 |  |  | 73,708
Common stock issued for accrued services, shares |  | 3,729 |  |  |  |
Common stock issued for conversion of salary |  | $ 5 | 72,287 |  |  | 72,292
Common stock issued for conversion of salary, shares |  | 5,164 |  |  |  |
Net Loss |  |  |  | (1,580,887) |  | (1,580,887)
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 cashless warrants exercised |  | $ 10 | (10) |  |  |
Common stock issued for cashless 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 preferred converted to common stock | $ (1,125,000) | $ 161 | 1,124,839 |  |  |
Series B preferred converted to common stock, Shares | (1,125) | 160,713 |  |  |  |
Common stock issued for accrued services |  | $ 4 | 32,913 |  |  | 32,917
Common stock issued for accrued services, shares |  | 4,523 |  |  |  |
Debt discount from warrants issued with notes payable - related parties |  |  | 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 | $ (32,595,310) | $ (157,452) | $ (127,270)
Balance, shares at Dec. 31, 2019 | 1,705 | 1,982,039 |  |  |  |

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