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Statements of Changes in Stockholders' Equity - USD ($) | Series A Convertible Preferred Stock [Member] | Series A-2 Convertible Preferred Stock [Member] | Series B Convertible Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 |  | $ 293 | $ 79 | $ 92 | $ 257 | $ 24,351,138 | $ (19,261,186) | $ 5,090,673
Balance (in shares) at Dec. 31, 2017 |  | 2,932,431 | 788,827 | 918,983 | 2,566,530 |  |  |
Issuance of common stock in initial public offering | [1] | $ 0 | $ 0 | $ 0 | $ 273 | 24,547,530 | 0 | 24,547,803
Issuance of common stock in initial public offering (in shares) | [1] | 0 | 0 | 0 | 2,730,000 |  |  |
Issuance of common stock in follow-on public offering (in shares) | [2] | 0 | 0 | 0 | 1,380,000 |  |  |
Issuance of common stock in follow-on public offering | [2] | $ 0 | $ 0 | $ 0 | $ 138 | 2,817,611 | 0 | 2,817,749
Exercise of warrants on a cashless basis |  | $ 0 | $ 0 | $ 0 | $ 6 | (6) | 0 | 0
Exercise of warrants on a cashless basis (in shares) |  | 0 | 0 | 0 | 61,385 |  |  |
Stock-based compensation |  | $ 0 | $ 0 | $ 0 | $ 0 | 1,615,470 | 0 | 1,615,470
Net loss |  | 0 | 0 | 0 | 0 | 0 | (17,253,108) | (17,253,108)
Exercise of stock options |  | $ 0 | $ 0 | $ 0 | $ 3 | 56,479 | 0 | 56,482
Exercise of stock options (in shares) |  | 0 | 0 | 0 | 28,965 |  |  |
Conversion of convertible preferred stock into common stock upon completion of initial public offering |  | $ (293) | $ (79) | $ (92) | $ 470 | (6) | 0 | 0
Conversion of convertible preferred stock into common stock upon completion of initial public offering (in shares) |  | (2,932,431) | (788,827) | (918,983) | 4,702,116 |  |  |
Balance at Dec. 31, 2018 |  | $ 0 | $ 0 | $ 0 | $ 1,147 | 53,388,216 | (36,514,294) | 16,875,069
Balance (in shares) at Dec. 31, 2018 |  | 0 | 0 | 0 | 11,468,996 |  |  |
Issuance of common stock in public offering | [3] | $ 0 | $ 0 | $ 0 | $ 505 | 12,958,070 | 0 | 12,958,575
Issuance of common stock in public offering (in shares) | [3] | 0 | 0 | 0 | 5,046,763 |  |  |
Exercise of stock options on a cashless basis |  | $ 0 | $ 0 | $ 0 | $ 24 | (24) | 0 | 0
Exercise of stock options on a cashless basis (in shares) |  | 0 | 0 | 0 | 236,466 |  |  |
Stock-based compensation |  | $ 0 | $ 0 | $ 0 | $ 0 | 2,511,944 | 0 | 2,511,944
Net loss |  | 0 | 0 | 0 | 0 | 0 | (21,156,758) | (21,156,758)
Exercise of stock options |  | 0 | 0 | 0 | $ 348,501 | 551,743 | 0 | 551,777
Exercise of stock options (in shares) |  |  |  |  | 34 |  |  |
Balance at Dec. 31, 2019 |  | $ 0 | $ 0 | $ 0 | $ 1,710 | $ 69,409,949 | $ (57,671,052) | $ 11,740,607
Balance (in shares) at Dec. 31, 2019 |  | 0 | 0 | 0 | 17,100,726 |  |  |
[1] | [1] Includes gross proceeds of $27,300,000, less total issuance costs of $2,752,197.
[2] | [2] Includes gross proceeds of $3,381,000, less total issuance costs of $563,251.
[3] | [3] Includes gross proceeds of $14,030,001, less total issuance costs of $1,071,931.

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