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Summary of significant accounting policies - Segment revenue (Details)
€ in Thousands
12 Months Ended
Dec. 31, 2019
EUR (€)
segment
item
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Disclosure of geographical areas [line items]      
Number of Co-CEOs | item 2    
Number of operating segments | segment 1    
Number of reportable segments | segment 1    
Revenue € 160,408 € 129,058 € 93,054
Property and equipment 17,434 5,020  
West Africa      
Disclosure of geographical areas [line items]      
Revenue 68,919 65,655 44,934
Property and equipment 5,201 2,552  
North Africa      
Disclosure of geographical areas [line items]      
Revenue 57,238 36,947 28,434
Property and equipment 4,878 1,620  
East Africa And South Africa [Member]      
Disclosure of geographical areas [line items]      
Revenue 32,839 25,947 16,808
Property and equipment 6,243 680  
Portugal      
Disclosure of geographical areas [line items]      
Revenue 43 509 2,067
Property and equipment 986 109  
France      
Disclosure of geographical areas [line items]      
Revenue     623
United Arab Emirates      
Disclosure of geographical areas [line items]      
Revenue 49    
Property and equipment 82 58  
Germany      
Disclosure of geographical areas [line items]      
Revenue 1,320   188
Property and equipment € 44 1  
Previously stated      
Disclosure of geographical areas [line items]      
Revenue   € 130,569 € 94,036