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Goodwill and intangible assets - Future Amortization Expense for Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]      
Remainder of 2021 $ 6,093    
2022 8,123    
2023 8,122    
2024 6,963    
2025 1,230    
Thereafter 6,048    
Total $ 36,579 $ 38,610 $ 31,533