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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, 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%