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Income Taxes - Reconciliation of the differences between statutory tax rate and the effective tax rate (Details)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Taxes      
PRC Statutory income tax rate 25.00% 25.00% 25.00%
Effect on tax rates in different tax jurisdiction (2.50%) (0.30%) (2.00%)
Effect of preferential tax rate for qualified HNTE entities (5.40%) (6.00%) (2.20%)
Additional deduction for research and development expenditures 17.70% 8.50% 7.20%
Share-based compensation expenses (19.70%) (10.50%) (8.40%)
Permanent book-tax differences 1.60% (1.40%) 6.20%
Change in valuation allowance (22.40%) (16.60%) (26.00%)
Effective tax rates (5.70%) (1.30%) (0.20%)