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Summary of significant accounting policies - Segment revenue (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2022
USD ($)
segment
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Disclosure of geographical areas [line items]      
Number of operating segments | segment 1    
Number of reportable segments | segment 1    
Revenue $ 221,882 $ 177,934 $ 159,366
Property and equipment 28,498 21,824  
West Africa      
Disclosure of geographical areas [line items]      
Revenue 110,528 83,364 72,029
Property and equipment 12,237 6,563  
North Africa      
Disclosure of geographical areas [line items]      
Revenue 63,148 60,494 55,330
Property and equipment 8,973 8,642  
East and South Africa      
Disclosure of geographical areas [line items]      
Revenue 39,309 32,080 30,940
Property and equipment 5,812 4,528  
Europe      
Disclosure of geographical areas [line items]      
Revenue 295 329 831
Property and equipment 1,209 1,905  
China      
Disclosure of geographical areas [line items]      
Property and equipment 163 131  
United Arab Emirates      
Disclosure of geographical areas [line items]      
Revenue 8,576 1,666 236
Property and equipment 104 55  
Others      
Disclosure of geographical areas [line items]      
Revenue $ 26 $ 1 $ 0