v3.22.2.2
Taxation - Reconciliation of differences between statutory income tax rate (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Taxation    
Statutory income tax rate of the PRC 25.00% 25.00%
Permanent differences 1.10% (1.20%)
Change in valuation allowance (24.10%) (16.80%)
Effect of preferential tax rate (0.80%) (3.80%)
Others (1.20%) (5.40%)
Effective income tax rate 0.00% (2.20%)