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Statements of Stockholders' Equity - USD ($) | Total | Preferred Convertible Stock | Common Stock | Additional Paid-in Capital | Treasury Stock | Accumulated Other Comprehensive Loss | Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2015 | $ (39,412,822) | $ 5,968,549 | $ 1,094,375 |  |  |  | $ (46,475,746)
Beginning balance, shares at Dec. 31, 2015 |  | 6,244,174 | 665,842 |  |  |  |
Stock-based compensation | 298,535 |  |  | $ 298,535 |  |  |
Conversion of warrants | 249,215 |  |  | 249,215 |  |  |
Conversion of warrants, shares |  |  | 127,143 |  |  |  |
Exercise of stock options | $ 137,403 |  | $ 112,101 | 25,302 |  |  |
Exercise of stock options, shares | 58,155 |  | 58,155 |  |  |  |
Effect of accretion to redemption value | $ (1,356,707) |  |  | (547,750) |  |  | (808,957)
Change in par value from no par value to $0.0001 |  |  | $ (1,206,391) | 1,206,391 |  |  |
Issuance of common stock upon initial public offering, net of issuance costs | 10,816,978 |  | $ 170 | 10,816,808 |  |  |
Issuance of common stock upon initial public offering, net of issuance costs, shares |  |  | 1,700,100 |  |  |  |
Issuance of warrants to underwriters | 126,218 |  |  | 126,218 |  |  |
Conversion of preferred redeemable convertible stock to common stock upon initial public offering | 44,463,613 |  | $ 378 | 44,463,235 |  |  |
Conversion of preferred redeemable convertible stock to common stock upon initial public offering, shares |  |  | 3,778,753 |  |  |  |
Conversion of preferred convertible stock to common stock upon initial public offering |  | $ (5,968,549) | $ 126 | 5,968,423 |  |  |
Conversion of preferred convertible stock to common stock upon initial public offering, shares |  | (6,244,174) | 1,259,187 |  |  |  |
Issuance of common stock upon secondary public offering, net of issuance costs | 25,976,262 |  | $ 169 | 25,976,093 |  |  |
Issuance of common stock upon secondary public offering, net of issuance costs, shares |  |  | 1,685,882 |  |  |  |
Net income (loss) | 3,733,707 |  |  |  |  |  | 3,733,707
Ending balance at Dec. 31, 2016 | 45,032,402 |  | $ 928 | 88,582,470 |  |  | (43,550,996)
Ending balance, shares at Dec. 31, 2016 |  |  | 9,275,062 |  |  |  |
Stock-based compensation | 736,066 |  |  | 736,066 |  |  |
Exercise of stock options | $ 588,482 |  | $ 28 | 588,454 |  |  |
Exercise of stock options, shares | 284,455 |  | 284,455 |  |  |  |
Shares issued pursuant to stock awards |  |  | $ 5 | (5) |  |  |
Shares issued pursuant to stock awards, shares |  |  | 57,475 |  |  |  |
Common stock repurchases | $ (1,257,100) |  |  |  | $ (1,257,100) |  |
Common stock repurchases, shares |  |  | (135,000) |  |  |  |
Reversal of costs related to secondary offering | 781 |  |  | 781 |  |  |
Unrealized gain (loss) on available-for-sale securities, net of deferred taxes | (16,907) |  |  |  |  | $ (16,907) |
Net income (loss) | 1,141,255 |  |  |  |  |  | 1,141,255
Ending balance at Dec. 31, 2017 | 46,224,979 |  | $ 961 | 89,907,766 | (1,257,100) | (16,907) | (42,409,741)
Ending balance, shares at Dec. 31, 2017 |  |  | 9,481,992 |  |  |  |
Stock-based compensation | 2,910,070 |  |  | 2,910,070 |  |  |
Exercise of stock options | $ 765,267 |  | $ 34 | 765,233 |  |  |
Exercise of stock options, shares | 341,456 |  | 341,456 |  |  |  |
Common stock repurchases | $ (2,174,430) |  |  |  | (2,174,430) |  |
Common stock repurchases, shares |  |  | (222,314) |  |  |  |
Unrealized gain (loss) on available-for-sale securities, net of deferred taxes | 5,766 |  |  |  |  | 5,766 |
Net income (loss) | (2,584,320) |  |  |  |  |  | (2,584,320)
Ending balance at Dec. 31, 2018 | $ 45,147,332 |  | $ 995 | $ 93,583,069 | $ (3,431,530) | $ (11,141) | $ (44,994,061)
Ending balance, shares at Dec. 31, 2018 |  |  | 9,601,134 |  |  |  |

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