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Goodwill and Intangible assets - Estimated Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
2020 remaining $ 831  
2021 2,879  
2022 1,277  
2023 982  
2024 899  
2025 632  
Thereafter 1,185  
Total $ 8,685 $ 11,029