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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Operating activities    
Net loss $ (8,663,365) $ (5,584,706)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation, amortization and impairment 14,387 12,699
Equity-based compensation expense 413,153 149,660
Shares issued for services 0 25,000
Change in fair value of warrant liability (5,205) (265,538)
Changes in operating assets and liabilities:    
Grants receivable 1,769,839 (3,212,678)
Prepaid expenses and other current assets (329,799) 799,210
Accounts payable (618,830) (607,904)
Accrued expenses and other current liabilities (59,774) 288,079
Deferred revenue 0 (541,701)
Net cash used in operating activities (7,479,594) (8,937,879)
Financing activities    
Proceeds from issuance of equity securities, net 27,256,384 14,810,945
Proceeds from warrants exercised for cash 1,485,351 636,214
Payments on note payable (477,028) (690,367)
Net cash provided by financing activities 28,264,707 14,756,792
Net increase in cash, cash equivalents and restricted cash 20,785,113 5,818,913
Cash, cash equivalents and restricted cash at beginning of period 11,118,614 3,738,900
Cash, cash equivalents and restricted cash at end of period 31,903,727 9,557,813
Supplemental disclosure of cash flow information:    
Cash paid for interest 1,468 6,615
Non-cash investing and financing activities:    
Accrued issuance costs for public offering 0 12,001
Prepaid expense financed by note payable $ 949,131