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Business combinations - Summary of Changes In Balance Payable From Acquisition of Subsidiaries (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Schedule of Changes in Balance Payable From Acquisition Of Subsidiaries [Abstract]    
At January 1 $ 4,000 $ 9,433
Addition due to acquisition—installments 1,880 0
Addition due to acquisition – earn-out 6,483 0
Payments of principal/finance charges—installments (3,556) (2,242)
Payments of principal/finance charges – earn-out (1,378) (1,254)
Fixed installments adjustment 44 0
Earn-out adjustment (785) (724)
Accrued interest and others 62 679
Exchange rate differences (327) (1,892)
At December 31 $ 6,423 $ 4,000