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Purchased intangible assets - Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2020 $ 736  
2021 644  
2022 27  
2023 27  
2024 27  
Thereafter 690  
Net Assets $ 2,151 $ 3,018