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Goodwill and Intangible assets - Estimated Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
2020 remaining $ 1,655  
2021 2,864  
2022 1,264  
2023 971  
2024 891  
2025 623  
Thereafter 1,121  
Total $ 9,389 $ 11,029