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v3.20.2

Shareholders' Equity - Changes in Shareholders’ Equity (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Beginning balance | $ 34,252,271 | $ 35,864,471 | $ 40,585,474 | $ 42,451,169 | $ 35,864,471 | $ 42,451,169
Stock issued | 436,613 |  | 149,180 |  |  |
Stock-based compensation |  | 426,939 | 580,603 | 309,563 | 863,552 |
Exercise of stock options | 55,743 | 175,000 |  |  | 230,743 |
Net loss | (2,651,422) | (2,214,139) | (2,695,792) | (2,175,258) | (4,865,561) | (4,871,050)
Ending balance | 32,093,205 | 34,252,271 | 38,619,465 | 40,585,474 | 32,093,205 | 38,619,465
Common Stock |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Beginning balance | 39,713 | 39,613 | 38,967 | 38,967 | 39,613 | 38,967
Stock issued |  |  | 398 |  |  |
Exercise of stock options | 23 | 100 |  |  | 123 |
Ending balance | 39,736 | 39,713 | 39,365 | 38,967 | 39,736 | 39,365
Treasury Stock |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Beginning balance | (18,929,915) | (18,929,915) | (18,929,915) | (18,929,915) | (18,929,915) | (18,929,915)
Ending balance | (18,929,915) | (18,929,915) | (18,929,915) | (18,929,915) | (18,929,915) | (18,929,915)
Additional paid-in capital |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Beginning balance | 96,707,690 | 96,105,851 | 94,694,793 | 94,385,230 | 96,105,851 | 94,385,230
Stock issued | 436,613 |  | 148,782 |  |  |
Stock-based compensation |  | 426,939 | 580,603 | 309,563 | 863,552 |
Exercise of stock options | 55,720 | 174,900 |  |  | 230,620 |
Ending balance | 97,200,023 | 96,707,690 | 95,424,178 | 94,694,793 | 97,200,023 | 95,424,178
Accumulated deficit |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Beginning balance | (43,565,217) | (41,351,078) | (35,218,371) | (33,043,113) | (41,351,078) | (33,043,113)
Net loss | (2,651,422) | (2,214,139) | (2,695,792) | (2,175,258) | (4,865,561) |
Ending balance | $ (46,216,639) | $ (43,565,217) | $ (37,914,163) | $ (35,218,371) | $ (46,216,639) | $ (37,914,163)

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