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Significant Accounting Policies - Estimated Useful Lives of Property, Plant and Equipment (Detail)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Pin pads and POS [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives 3 years 3 years 5 years
Furniture and fixtures [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives 10 years    
Telephony equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives 5 years    
Vehicles [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives 5 years    
Bottom of range [member] | IT equipment and facilities [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives 5 years    
Bottom of range [member] | Leasehold improvements [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives 3 years    
Top of range [member] | IT equipment and facilities [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives 10 years    
Top of range [member] | Leasehold improvements [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives 5 years