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Taxation - Sales tax (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Sales tax            
Value added tax rate, services provided (as a percent)     6.00%      
Value added tax rate, sales of general goods (as a percent) 16.00% 13.00% 13.00% 13.00% 13.00% 13.00%