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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.