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Condensed Consolidated Statements of Stockholders' Equity (Deficit) (Unaudited) - USD ($)
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Total
Beginning balance, value at Dec. 31, 2019 $ 12,079 $ 83,216,387 $ (2,157,226) $ (87,388,619) $ (6,317,379)
Balance, shares at Dec. 31, 2019 12,079,095        
Stock-based compensation 311,677 311,677
Restricted common stock grant $ 530 (530)
Restricted common stock grant, shares 530,050        
Restricted common stock forfeitures $ (23) 23
Restricted common stock forfeitures, shares (22,500)        
Issuance of common stock upon conversion of secured convertible notes and interest $ 960 1,342,400 1,343,360
Issuance of common stock upon conversion of secured convertible notes and interest, shares 959,543        
Issuance of common stock through underwritten public offering (net of offering expenses and underwriters’ discount) $ 2,522 2,499,614 2,502,136
Balance, shares 2,521,740        
Issuance of common stock purchase warrants in connection with issuance of unsecured promissory note payable 20,806 20,806
Net loss (2,334,110) (2,334,110)
Ending balance, value at Mar. 31, 2020 $ 16,068 87,390,377 (2,157,226) (89,722,729) (4,473,510)
Balance, shares at Mar. 31, 2020 16,067,928        
Beginning balance, value at Dec. 31, 2019 $ 12,079 83,216,387 (2,157,226) (87,388,619) (6,317,379)
Balance, shares at Dec. 31, 2019 12,079,095        
Net loss         (2,832,004)
Ending balance, value at Jun. 30, 2020 $ 26,645 105,697,031 (2,157,226) (90,220,623) 13,345,827
Balance, shares at Jun. 30, 2020 26,645,118        
Beginning balance, value at Mar. 31, 2020 $ 16,068 87,390,377 (2,157,226) (89,722,729) (4,473,510)
Balance, shares at Mar. 31, 2020 16,067,928        
Stock-based compensation 376,738 376,738
Restricted common stock grant $ 135 (135)
Restricted common stock grant, shares 135,450        
Restricted common stock forfeitures $ (13) 13
Restricted common stock forfeitures, shares (12,750)        
Issuance of common stock through registered direct offering at $3.095 per share and accompanying warrants (net of offering expenses and placement agent discount) $ 3,554 5,346,859 5,350,413
Issuance of common stock through underwritten public offering at $1.65 per share (net of offering expenses and underwriters' discount), shares 3,554,545        
Issuance of common stock through registered direct offering at $2.80 per share and accompanying warrants (net of offering expenses and placement agent discount) $ 2,540 4,974,152 4,976,692
Issuance of common stock through underwritten public offering at $2.15 per share (net of offering expenses and underwriters' discount), shares 2,539,534        
Issuance of common stock upon conversion of secured convertible notes and interest $ 1,665 1,679,660 1,681,325
Issuance of common stock upon conversion of secured convertible notes and interest, shares 1,664,669        
Issuance of common stock upon exercise of common stock purchase warrants $ 2,694 5,200,428 5,203,122
Issuance of common stock upon exercise of common stock purchase warrants, shares 2,693,867        
Issuance of common stock upon exercise of stock options $ 2 7,798 7,800
Issuance of common stock upon exercise of stock options, shares 1,875        
Issuance of common stock purchase warrants in connection with issuance of secured convertible notes 721,141 721,141
Net loss (497,894) (497,894)
Ending balance, value at Jun. 30, 2020 $ 26,645 105,697,031 (2,157,226) (90,220,623) 13,345,827
Balance, shares at Jun. 30, 2020 26,645,118        
Beginning balance, value at Dec. 31, 2020 $ 26,835 106,501,396 (2,157,226) (90,014,500) 14,356,505
Balance, shares at Dec. 31, 2020 26,834,709        
Stock-based compensation 326,164 326,164
Restricted common stock grant $ 450 (450)
Restricted common stock grant, shares 450,000        
Restricted common stock forfeitures $ (8) 8
Restricted common stock forfeitures, shares (7,500)        
Issuance of common stock through registered direct offering at $3.095 per share and accompanying warrants (net of offering expenses and placement agent discount) $ 2,800 6,726,200 6,729,000
Issuance of common stock through underwritten public offering at $1.65 per share (net of offering expenses and underwriters' discount), shares 2,800,000        
Issuance of common stock through registered direct offering at $2.80 per share and accompanying warrants (net of offering expenses and placement agent discount) $ 3,250 6,614,350 6,617,600
Issuance of common stock through underwritten public offering at $2.15 per share (net of offering expenses and underwriters' discount), shares 3,250,000        
Exercise of pre-funded common stock purchase warrants at $3.095 per share $ 7,200 22,276,800 22,284,000
Exercise of pre-funded common stock purchase warrants at $3.095 per share, shares 7,200,000        
Exercise of pre-funded common stock purchase warrants at $2.80 per share $ 11,050 30,928,950 30,940,000
Exercise of pre-funded common stock purchase warrants at $2.80 per share, shares 11,050,000        
Issuance of pre-funded common stock purchase warrants in connection with the registered direct offerings (1,817,548) (1,817,548)
Issuance of common stock purchase warrants at exercise price of $3.25 per share in connection with the registered direct offerings (49,398,510) (49,398,510)
Net loss 21,721,858 21,721,858
Ending balance, value at Mar. 31, 2021 $ 51,577 122,157,360 (2,157,226) (68,292,642) 51,759,069
Balance, shares at Mar. 31, 2021 51,577,209        
Beginning balance, value at Dec. 31, 2020 $ 26,835 106,501,396 (2,157,226) (90,014,500) 14,356,505
Balance, shares at Dec. 31, 2020 26,834,709        
Net loss         16,339,371
Ending balance, value at Jun. 30, 2021 $ 51,577 122,487,573 (2,157,226) (73,675,129) 46,706,795
Balance, shares at Jun. 30, 2021 51,577,209        
Beginning balance, value at Mar. 31, 2021 $ 51,577 122,157,360 (2,157,226) (68,292,642) 51,759,069
Balance, shares at Mar. 31, 2021 51,577,209        
Stock-based compensation 330,213 330,213
Net loss (5,382,487) (5,382,487)
Ending balance, value at Jun. 30, 2021 $ 51,577 $ 122,487,573 $ (2,157,226) $ (73,675,129) $ 46,706,795
Balance, shares at Jun. 30, 2021 51,577,209