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Share-based compensation - 2014 Plan (Detail) - 2014 Plan - USD ($)
1 Months Ended 12 Months Ended
Apr. 30, 2014
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of restricted share vested   228,200 1,318,450 2,086,450
Unrecognized compensation costs on restricted shares   $ 12,000 $ 766,000  
Restricted shares | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for grant 14,195,412      
Restricted shares | Officers and Employees [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted shares expected to vest   14,536,000 14,536,000  
Restricted shares | Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted shares expected to vest   26,000