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Condensed Statements of Changes in Stockholders' Equity - USD ($) | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Total
--- | --- | --- | --- | ---
Balance at Dec. 31, 2019 |  | $ 1,710 | $ 69,409,949 | $ (57,671,052) | $ 11,740,607
Balance (in shares) at Dec. 31, 2019 |  | 17,100,726 |  |  |
Issuance of common stock and warrants in private placement | [1] | $ 267 | 5,451,475 | 0 | 5,451,742
Issuance of common stock and warrants in private placement(in shares) | [1] | 2,675,293 |  |  |
Stock-based compensation |  | $ 0 | 583,865 | 0 | 583,865
Net loss |  | 0 | 0 | (5,450,910) | (5,450,910)
Balance at Mar. 31, 2020 |  | $ 1,977 | 75,445,289 | (63,121,962) | 12,325,304
Balance (in shares) at Mar. 31, 2020 |  | 19,776,019 |  |  |
Balance at Dec. 31, 2019 |  | $ 1,710 | 69,409,949 | (57,671,052) | 11,740,607
Balance (in shares) at Dec. 31, 2019 |  | 17,100,726 |  |  |
Stock-based compensation |  |  |  |  | 1,217,011
Net loss |  |  |  |  | (10,466,475)
Balance at Jun. 30, 2020 |  | $ 1,994 | 76,454,839 | (68,137,527) | 8,319,306
Balance (in shares) at Jun. 30, 2020 |  | 19,943,683 |  |  |
Balance at Mar. 31, 2020 |  | $ 1,977 | 75,445,289 | (63,121,962) | 12,325,304
Balance (in shares) at Mar. 31, 2020 |  | 19,776,019 |  |  |
Exercise of warrants on a cashless basis (in shares) |  | 167,664 |  |  |
Exercise of stock warrants |  | $ 17 | 376,404 | 0 | 376,421
Stock-based compensation |  | 0 | 633,146 | 0 | 633,146
Net loss |  | 0 | 0 | (5,015,565) | (5,015,565)
Balance at Jun. 30, 2020 |  | $ 1,994 | 76,454,839 | (68,137,527) | 8,319,306
Balance (in shares) at Jun. 30, 2020 |  | 19,943,683 |  |  |
Balance at Dec. 31, 2020 |  | $ 2,498 | 92,742,306 | (77,440,919) | 15,303,885
Balance (in shares) at Dec. 31, 2020 |  | 24,978,585 |  |  |
Exercise of stock warrants |  | $ 65 | 1,530,925 |  | 1,530,990
Exercise of stock warrants (in shares) |  | 644,992 |  |  |
Stock-based compensation |  | $ 0 | 656,913 | 0 | 656,913
Net loss |  | 0 | 0 | (5,351,667) | (5,351,667)
Balance at Mar. 31, 2021 |  | $ 2,563 | 94,930,144 | (82,792,586) | 12,140,121
Balance (in shares) at Mar. 31, 2021 |  | 25,623,577 |  |  |
Balance at Dec. 31, 2020 |  | $ 2,498 | 92,742,306 | (77,440,919) | 15,303,885
Balance (in shares) at Dec. 31, 2020 |  | 24,978,585 |  |  |
Stock-based compensation |  |  |  |  | 1,294,268
Net loss |  |  |  |  | (10,193,067)
Balance at Jun. 30, 2021 |  | $ 2,595 | 96,621,948 | (87,633,986) | 8,990,557
Balance (in shares) at Jun. 30, 2021 |  | 25,946,646 |  |  |
Balance at Mar. 31, 2021 |  | $ 2,563 | 94,930,144 | (82,792,586) | 12,140,121
Balance (in shares) at Mar. 31, 2021 |  | 25,623,577 |  |  |
Issuance of SVB warrants | [2] |  | 351,390 |  | 351,390
Exercise of stock options on a cashless basis (in shares) |  | 91,047 |  |  |
Exercise of stock warrants |  | $ 23 | 572,978 |  | 573,001
Exercise of stock warrants (in shares) |  | 232,022 |  |  |
Exercise of stock options |  | $ 9 | 130,081 |  | 130,090
Stock-based compensation |  |  | 637,355 |  | 637,355
Net loss |  |  |  | (4,841,400) | (4,841,400)
Balance at Jun. 30, 2021 |  | $ 2,595 | $ 96,621,948 | $ (87,633,986) | $ 8,990,557
Balance (in shares) at Jun. 30, 2021 |  | 25,946,646 |  |  |
[1] | Includes gross proceeds of $5,984,931, less total issuance costs of $533,189.
[2] | Allocated fair value of warrants of $354,539, less allocated issuance costs of $3,149.

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