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Condensed Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities    
Net loss $ (16,804,733) $ (7,984,672)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation expense 19,123 10,546
Stock-based compensation expense 1,274,807 1,069,930
Non-cash operating lease cost (11,811) 9,940
Changes in operating assets and liabilities:    
Accounts receivable 0 (10,000,000)
Other receivables 1,130,694 (992,334)
Prepaid expenses (1,403,634) (3,427,756)
Other current assets (272,100) 0
Other non-current assets (44,934) 91,690
Accounts payable 4,513,162 (988,855)
Accrued expenses (6,700,216) 3,211,123
Deferred grant funding (4,609,482) (1,791,598)
Deferred revenue 205,206 0
Net cash used in operating activities (22,703,918) (20,791,986)
Cash flows from investing activities    
Purchases of property and equipment 0 (5,369)
Net cash used in investing activities 0 (5,369)
Cash flows from financing activities    
Net proceeds from issuance of common stock 452,195 1,218,750
Proceeds from the exercise of common stock warrants 1,299,375 120,149
Net cash provided by financing activities 1,751,570 1,338,899
Effect of exchange rate changes on cash and cash equivalents and restricted cash (53,156) (145,019)
Net change in cash, cash equivalents and restricted cash (21,005,504) (19,603,475)
Cash, cash equivalents and restricted cash, beginning of period 34,669,605 51,674,087
Cash, cash equivalents and restricted cash, end of period 13,664,101 32,070,612
Reconciliation of cash, cash equivalents and restricted cash to amounts reported in the condensed consolidated balance sheets:    
Cash and cash equivalents 13,329,101 32,070,612
Restricted cash included in other non-current assets 335,000 0
Total cash, cash equivalents and restricted cash 13,664,101 32,070,612
Supplemental disclosure of non-cash investing and financing activities:    
Operating right-of-use assets obtained in exchange for new operating lease liabilities, net $ 0 $ 1,043,590