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Summary of Significant Accounting Policies - Assets and liabilities of consolidated VIEs (Details) - USD ($)
Jun. 30, 2025
Dec. 31, 2024
Assets    
Cash $ 1,767,406 $ 371,497
Total assets 16,993,377 16,797,812
Liabilities    
Accounts payable 1,401,714 1,882,357
Total liabilities 19,821,616 18,087,459
Variable Interest Entity | Levo Mobility LLC    
Assets    
Cash 188 10,404
Intercompany loan receivable 1,024,421 930,019
Prepaid expenses and other current assets 52,190 52,190
Total assets 1,076,799 992,613
Liabilities    
Accounts payable 209,233 166,681
Promissory notes 934,046 884,676
Total liabilities $ 1,143,279 $ 1,051,357