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Applicable laws and regulations - Schedule of provision and reserve (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Statement [Line Items]    
Statutory reserve $ 136,019 $ 136,019
Dynamic provision    
Statement [Line Items]    
Statutory reserve 136,019 136,019
Regulatory credit reserve    
Statement [Line Items]    
Statutory reserve $ 0 $ 0