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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Statement [Abstract]    
Revenues $ 16,140,838
Operating expenses:    
Research and development 7,665,559 9,748,469
General and administrative 5,329,776 8,247,795
Total operating expenses 12,995,335 17,996,264
Operating income (loss) 3,145,503 (17,996,264)
Other income (expense)    
Interest and investment income 67,700 75,650
Interest expense (203,292) (386,618)
Gain on extinguishment of debt 234,802
Unrealized gain (loss) on warrant liability 355,890 (2,892,189)
Litigation settlement (4,000,000)
Total other expense, net (3,779,702) (2,968,355)
Loss before income tax expense (634,199) (20,964,619)
Income tax expense (200) (200)
Net loss $ (634,399) $ (20,964,819)
Basic loss per share attributable to common stock $ (0.01) $ (0.38)
Weighted average common shares outstanding, 86,934,618 55,688,085
Diluted loss per share attributable to common stock $ (0.01) $ (0.38)
Weighted average common shares outstanding, diluted 86,934,618 55,688,085
Comprehensive loss:    
Net loss $ (634,399) $ (20,964,819)
Unrealized net gain (loss) on available-for-sale securities (18,016) 38
Comprehensive loss $ (652,415) $ (20,964,781)