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Summary of accounting policies - Segment revenue (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2023
USD ($)
segment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Disclosure of geographical areas [line items]      
Number of operating segments | segment 1    
Number of reportable segments | segment 1    
Revenue $ 186,402 $ 203,300 $ 167,624
Property and equipment 14,361 28,498  
West Africa      
Disclosure of geographical areas [line items]      
Revenue 83,608 103,402 79,860
Property and equipment 6,709 12,237  
North Africa      
Disclosure of geographical areas [line items]      
Revenue 76,641 57,495 57,041
Property and equipment 3,584 8,973  
East and South Africa      
Disclosure of geographical areas [line items]      
Revenue 24,365 33,507 28,728
Property and equipment 3,409 5,812  
Europe      
Disclosure of geographical areas [line items]      
Revenue 1,152 294 329
Property and equipment 532 1,209  
China      
Disclosure of geographical areas [line items]      
Property and equipment 80 163  
United Arab Emirates      
Disclosure of geographical areas [line items]      
Revenue 629 8,576 1,666
Property and equipment 47 104  
Others      
Disclosure of geographical areas [line items]      
Revenue $ 8 $ 26 $ 0