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Intangible assets and goodwill - Amortization expense related to identifiable intangible assets in future periods (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Amortization expense related to identifiable intangible assets in future periods    
2021 remaining $ 1,661  
2022 2,195  
2023 2,140  
2024 2,140  
2025 2,139  
Thereafter 11,885  
Total $ 22,160 $ 22,714