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Share-based compensation - 2014 Plan (Detail) - 2014 Plan [Member] - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2014
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for grant   0    
Leading Advice Holdings Limited [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock Issued During Period, Shares, New Issues 14,195,412      
Restricted shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of restricted share vested   26,000 228,200 1,318,450
Unrecognized compensation costs on restricted shares   $ 0 $ 12  
Restricted shares [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for grant 14,195,412