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Property, Plant and Equipment - Summary of detailed information about property plant and equipment (Detail) - HKD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance $ 67,131    
Ending balance 90,078 $ 67,131  
Carrying amount 90,078 67,131 $ 111,357
Fixtures and fittings [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Carrying amount 0 0 376
Computer equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Carrying amount 90,078 67,131 $ 110,981
Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 4,195,458    
Additions 12,848    
Additions from acquisition of subsidiaries (Note 34) 138,647    
Disposal of subsidiaries (4,195,458)    
Exchange realignment 411    
Ending balance 151,906 4,195,458  
Cost [member] | Fixtures and fittings [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 11,090    
Additions 0    
Additions from acquisition of subsidiaries (Note 34) 0    
Disposal of subsidiaries (11,090)    
Exchange realignment 0    
Ending balance 0 11,090  
Cost [member] | Computer equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 4,184,368    
Additions 12,848    
Additions from acquisition of subsidiaries (Note 34) 138,647    
Disposal of subsidiaries (4,184,368)    
Exchange realignment 411    
Ending balance 151,906 4,184,368  
Accumulated depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (4,128,327) (4,084,101)  
Charge for the year (96,115) (44,226)  
Disposal of subsidiaries 4,162,924    
Exchange realignment (310)    
Ending balance (61,828) (4,128,327)  
Accumulated depreciation [member] | Fixtures and fittings [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (11,090) (10,714)  
Charge for the year 0 (376)  
Disposal of subsidiaries 11,090    
Exchange realignment 0    
Ending balance 0 (11,090)  
Accumulated depreciation [member] | Computer equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (4,117,237) (4,073,387)  
Charge for the year (96,115) (43,850)  
Disposal of subsidiaries 4,151,834    
Exchange realignment (310)    
Ending balance $ (61,828) $ (4,117,237)