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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Operating expenses:        
Research and development $ 1,464,687 $ 2,268,984 $ 3,045,228 $ 4,780,739
General and administrative 1,525,592 1,953,535 3,059,544 4,038,795
Total operating expenses 2,990,279 4,222,519 6,104,772 8,819,534
Operating loss (2,990,279) (4,222,519) (6,104,772) (8,819,534)
Other income (expense):        
Interest and investment income 17,344 7,177 27,993 67,115
Interest expense (57,428) (87,847) (126,401) (221,192)
Unrealized gain (loss) on warrant liability 221,322 (2,066,445) 26,257 (3,166,474)
Litigation settlement (4,000,000) (4,000,000)
Total other expense, net (3,818,762) (2,147,115) (4,072,151) (3,320,551)
Loss before income tax expense (6,809,041) (6,369,634) (10,176,923) (12,140,085)
Income tax expense (200) (200)
Net loss $ (6,809,041) $ (6,369,634) $ (10,177,123) $ (12,140,285)
Basic loss per share attributable to common stock $ (0.08) $ (0.13) $ (0.12) $ (0.27)
Weighted average common shares outstanding, basic 88,290,650 49,769,253 85,556,110 45,558,442
Diluted loss per share attributable to common stock $ (0.08) $ (0.13) $ (0.12) $ (0.27)
Weighted average common shares outstanding, diluted 88,290,650 49,769,253 85,556,110 45,558,442
Comprehensive loss:        
Net loss $ (6,809,041) $ (6,369,634) $ (10,177,123) $ (12,140,285)
Net unrealized gain (loss) on available-for-sale securities 22,273 (104) (186) (66)
Comprehensive loss $ (6,786,768) $ (6,369,738) $ (10,177,309) $ (12,140,351)