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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Operating activities:      
Net loss $ (10,284,303) $ (10,339,145)  
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 48,473 42,988  
Stock-based compensation expense 969,559 941,523  
Other non-cash items 330,376 782,880  
Changes in operating assets and liabilities:      
Prepaid expenses and other current assets (493,321) (1,252,940)  
Long-term deposits and other noncurrent assets 9,853 1,778  
Accounts payable and other current liabilities 46,663 1,265,791  
Defined benefit pension plan (57,277) (68,395)  
Deferred grant income 22,445 (294,989)  
Total changes in operating assets and liabilities (471,637) (348,755)  
Cash used in operating activities (9,407,532) (8,920,509)  
Cash flow from financing activities:      
Net proceeds from issuance of shares in ATM offering (Note 13) 1,819,142 4,910,240  
Net proceeds from the exercise of warrants (Note 13) 2,063    
Payments of current portion of long-term debt (Note 11) (50,822) (46,480)  
Cash provided by financing activities 1,770,383 4,863,760  
Effect of exchange rate changes (117,042) 369,605  
Net decrease in cash, cash equivalents and restricted cash (7,754,191) (3,687,144)  
Cash, cash equivalents and restricted cash at beginning of period 20,873,924 10,417,558 $ 10,417,558
Cash, cash equivalents and restricted cash at end of period $ 13,119,733 $ 6,730,414 $ 20,873,924