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v3.19.3

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) | Total | Common Stock | Treasury Stock | Additional paid-in capital | Accumulated deficit
--- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ 49,975,264 | $ 38,937 | $ (16,625,873) | $ 93,913,557 | $ (27,351,357)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock-based compensation | 269,596 |  |  | 269,596 |
Net loss | (2,043,292) |  |  |  | (2,043,292)
Ending balance at Mar. 31, 2018 | 47,826,748 | 38,937 | (17,000,693) | 94,183,153 | (29,394,649)
Beginning balance at Dec. 31, 2017 | 49,975,264 | 38,937 | (16,625,873) | 93,913,557 | (27,351,357)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net loss | (5,179,424) |  |  |  |
Ending balance at Sep. 30, 2018 | 42,909,938 | 38,967 | (18,929,915) | 94,331,667 | (32,530,781)
Beginning balance at Mar. 31, 2018 | 47,826,748 | 38,937 | (17,000,693) | 94,183,153 | (29,394,649)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock-based compensation | 73,425 |  |  | 73,425 |
Net loss | (1,596,637) |  |  |  | (1,596,637)
Ending balance at Jun. 30, 2018 | 46,303,536 | 38,937 | (17,000,693) | 94,256,578 | (30,991,286)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock-based compensation | 70,619 |  |  | 70,619 |
Net loss | (1,539,495) |  |  |  | (1,539,495)
Ending balance at Sep. 30, 2018 | $ 42,909,938 | $ 38,967 | $ (18,929,915) | 94,331,667 | (32,530,781)
Beginning balance (in shares) at Dec. 31, 2018 | 38,966,988 | 38,966,988 | (12,253,502) |  |
Beginning balance at Dec. 31, 2018 | $ 42,451,169 | $ 38,967 | $ (18,929,915) | 94,385,230 | (33,043,113)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock-based compensation | 309,563 |  |  | 309,563 |
Net loss | (2,175,258) |  |  |  | (2,175,258)
Ending balance at Mar. 31, 2019 | $ 40,585,474 | $ 38,967 | $ (18,929,915) | 94,694,793 | (35,218,371)
Beginning balance (in shares) at Dec. 31, 2018 | 38,966,988 | 38,966,988 | (12,253,502) |  |
Beginning balance at Dec. 31, 2018 | $ 42,451,169 | $ 38,967 | $ (18,929,915) | 94,385,230 | (33,043,113)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock-based compensation | $ 1,034,346 |  |  | 1,034,346 |
Exercise of stock options (in shares) | 635,500 | 499,671 |  |  |
Exercise of stock options | $ 328,590 | $ 500 |  | 328,090 |
Net loss | $ (6,569,434) |  |  |  | (6,569,434)
Ending balance (in shares) at Sep. 30, 2019 | 39,466,659 | 39,466,659 | (12,253,502) |  |
Ending balance at Sep. 30, 2019 | $ 37,244,671 | $ 39,467 | $ (18,929,915) | 95,747,666 | (39,612,547)
Beginning balance at Mar. 31, 2019 | 40,585,474 | 38,967 | (18,929,915) | 94,694,793 | (35,218,371)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock-based compensation | 580,603 |  |  | 580,603 |
Net loss | (2,695,792) |  |  |  | (2,695,792)
Ending balance at Jun. 30, 2019 | 38,619,465 | $ 39,365 | $ (18,929,915) | 95,424,178 | (37,914,163)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock-based compensation | 144,180 |  |  | 144,180 |
Net loss | $ (1,698,384) |  |  |  | (1,698,384)
Ending balance (in shares) at Sep. 30, 2019 | 39,466,659 | 39,466,659 | (12,253,502) |  |
Ending balance at Sep. 30, 2019 | $ 37,244,671 | $ 39,467 | $ (18,929,915) | $ 95,747,666 | $ (39,612,547)

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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