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Intangible assets - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
2021 $ 4,285  
2022 2,404  
2023 522  
2024 522  
2025 522  
2026 and thereafter 1,786  
Net $ 10,041 $ 14,326