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Intangible assets - Future amortization expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Estimated amortization expense for the next five years    
Acquired licenses, net $ 58,778 $ 62,686
Licenses    
Estimated amortization expense for the next five years    
2023 126  
2024 126  
2025 126  
2026 126  
2027 126  
Thereafter 816  
Acquired licenses, net $ 1,446 $ 1,928