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Related party transactions - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Jan. 31, 2021
Dec. 31, 2020
Dec. 31, 2014
Dec. 31, 2021
Schedule of Other Related Party Transactions [Line Items]        
Repayment of loans to related party   $ 662,000    
Treasury stock [Member]        
Schedule of Other Related Party Transactions [Line Items]        
Interest on withheld tax price     5.00%  
Aiden & Jasmine Limited | Treasury stock [Member]        
Schedule of Other Related Party Transactions [Line Items]        
Shares repurchased     3,860,733  
Shares repurchased, value     $ 10,879,000  
Interest on withheld tax     363,000  
Withholding Tax Payable Non-current     $ 1,451,000  
Vantage Point Global Limited        
Schedule of Other Related Party Transactions [Line Items]        
Interest on withheld tax       $ 55,000
Repayment of loans to related party $ 3,883,000      
Vantage Point Global Limited | Treasury stock [Member]        
Schedule of Other Related Party Transactions [Line Items]        
Shares repurchased     10,334,679  
Shares repurchased, value     $ 29,121,000  
Interest on withheld tax     971,000  
Withholding Tax Payable Non-current     $ 3,883,000