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Taxes (Details 1)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]      
China statutory income tax rate 25.00% 25.00% 25.00%
Preferential tax rate reduction (9.60%) (8.40%) (9.70%)
75% of research and development expenses deduction     0.10%
Tax rate difference outside of PRC   (3.40%) (1.30%)
Change in valuation allowance (15.30%) (12.60%) (16.50%)
Permanent difference (0.10%) (0.10%) 1.50%
Effective tax rate 0.50% (0.90%)