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Current and deferred tax - Summary of Movement on Deferred Tax Liabilities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of changes in deferred tax liabilities [Line Items]    
To profit and loss $ 10,211 $ 843
Deferred tax liabilities [Member]    
Reconciliation of changes in deferred tax liabilities [Line Items]    
Balance Beginning 731 325
Acquisition of subsidiaries 1,548 219
To profit and loss (234) 187
Balance Ending 2,045 731
Deferred tax liabilities [Member] | Goodwill    
Reconciliation of changes in deferred tax liabilities [Line Items]    
Balance Beginning 187  
To profit and loss 96 187
Balance Ending 283 187
Deferred tax liabilities [Member] | Customer relationship    
Reconciliation of changes in deferred tax liabilities [Line Items]    
Balance Beginning 325 325
Acquisition of subsidiaries 1,424  
To profit and loss (285)  
Balance Ending 1,464 325
Deferred tax liabilities [Member] | Intellectual property    
Reconciliation of changes in deferred tax liabilities [Line Items]    
Balance Beginning 219  
Acquisition of subsidiaries 65 219
To profit and loss (61)  
Balance Ending 223 $ 219
Deferred tax liabilities [Member] | Others    
Reconciliation of changes in deferred tax liabilities [Line Items]    
Acquisition of subsidiaries 59  
To profit and loss 16  
Balance Ending $ 75