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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities    
Net loss $ (8,398,670) $ (7,323,644)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 5,227 6,410
Stock-based compensation 532,409 365,911
Non-cash operating lease cost (9,758) (24,224)
Gain on extinguishment of notes payable and accrued interest 0 (369,887)
Changes in operating assets and liabilities:    
Other receivables (584,534) 158,333
Prepaid expenses (4,293,814) 217,188
Other non-current assets 87,891 (128,086)
Accounts payable 727,783 450,298
Accrued expenses 401,613 (837,191)
Deferred grant funding (811,620) (892,123)
Net cash used in operating activities (12,343,473) (8,377,015)
Cash flows from investing activities    
Purchases of property and equipment (4,553) 0
Net cash used in investing activities (4,553) 0
Cash flows from financing activities    
Net proceeds from issuance of common stock 0 11,324,140
Proceeds from the exercise of common stock warrants 0 50,400
Net cash provided by financing activities 0 11,374,540
Effect of exchange rate changes on cash and cash equivalents (9,150) (6,841)
Net change in cash and cash equivalents (12,357,176) 2,990,684
Cash and cash equivalents, beginning of period 51,674,087 4,669,467
Cash and cash equivalents, end of period 39,316,911 7,660,151
Supplemental disclosure of non-cash investing and financing activities:    
Forgiveness of Paycheck Protection Program note payable 0 369,887
Operating right-of-use assets obtained in exchange for new operating lease liabilities $ 1,043,590 $ 308,533