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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' DEFICIT (UNAUDITED) - USD ($) | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | ---
Beginning balance, value at Dec. 31, 2018 | $ 11,718 | $ 70,651,413 | $ (74,596,536) | $ (3,933,405)
Balance at ending (in shares) at Dec. 31, 2018 | 11,718,246 |  |  |
Net loss |  |  | (934,716) | (934,716)
Costs related to stock offering |  | (64,371) |  | (64,371)
Common stock issued upon exercise of options |  |  |  |
Common stock issued upon exercise of options (in shares) | 521 |  |  |
Stock-based compensation expense | $ 18 | 330,769 |  | 330,787
Stock-based compensation expense (in shares) | 17,619 |  |  |
Ending balance, value at Mar. 31, 2019 | $ 11,736 | 70,917,811 | (75,531,252) | (4,601,705)
Balance at ending (in shares) at Mar. 31, 2019 | 11,736,386 |  |  |
Beginning balance, value at Dec. 31, 2018 | $ 11,718 | 70,651,413 | (74,596,536) | (3,933,405)
Balance at ending (in shares) at Dec. 31, 2018 | 11,718,246 |  |  |
Net loss |  |  |  | (1,815,883)
Ending balance, value at Jun. 30, 2019 | $ 11,820 | 71,104,418 | (76,412,419) | (5,296,181)
Balance at ending (in shares) at Jun. 30, 2019 | 11,820,390 |  |  |
Beginning balance, value at Mar. 31, 2019 | $ 11,736 | 70,917,811 | (75,531,252) | (4,601,705)
Balance at ending (in shares) at Mar. 31, 2019 | 11,736,386 |  |  |
Net loss |  |  | (881,167) | (881,167)
Costs related to stock offering |  | (55,200) |  | (55,200)
Stock-based compensation expense | $ 79 | 209,488 |  | 209,567
Stock-based compensation expense (in shares) | 79,054 |  |  |
Common stock issued as employee compensation | $ 5 | 32,319 |  | 32,324
Common stock issued as employee compensation (in shares) | 4,950 |  |  |
Ending balance, value at Jun. 30, 2019 | $ 11,820 | 71,104,418 | (76,412,419) | (5,296,181)
Balance at ending (in shares) at Jun. 30, 2019 | 11,820,390 |  |  |
Beginning balance, value at Dec. 31, 2019 | $ 11,819 | 71,294,629 | (79,046,688) | $ (7,740,240)
Balance at ending (in shares) at Dec. 31, 2019 | 11,818,830 |  |  | 11,818,830
Net loss |  |  | (2,812,519) | $ (2,812,519)
Stock-based compensation expense | $ 18 | 347,167 |  | 347,185
Stock-based compensation expense (in shares) | 18,388 |  |  |
Ending balance, value at Mar. 31, 2020 | $ 11,837 | 71,641,796 | (81,859,207) | (10,205,574)
Balance at ending (in shares) at Mar. 31, 2020 | 11,837,218 |  |  |
Beginning balance, value at Dec. 31, 2019 | $ 11,819 | 71,294,629 | (79,046,688) | $ (7,740,240)
Balance at ending (in shares) at Dec. 31, 2019 | 11,818,830 |  |  | 11,818,830
Net loss |  |  |  | $ (3,409,350)
Ending balance, value at Jun. 30, 2020 | $ 11,856 | 71,830,980 | (82,456,038) | $ (10,613,202)
Balance at ending (in shares) at Jun. 30, 2020 | 11,855,606 |  |  | 11,855,606
Beginning balance, value at Mar. 31, 2020 | $ 11,837 | 71,641,796 | (81,859,207) | $ (10,205,574)
Balance at ending (in shares) at Mar. 31, 2020 | 11,837,218 |  |  |
Net loss |  |  | (596,831) | (596,831)
Stock-based compensation expense | $ 19 | 189,184 |  | 189,203
Stock-based compensation expense (in shares) | 18,388 |  |  |
Ending balance, value at Jun. 30, 2020 | $ 11,856 | $ 71,830,980 | $ (82,456,038) | $ (10,613,202)
Balance at ending (in shares) at Jun. 30, 2020 | 11,855,606 |  |  | 11,855,606

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