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Condensed consolidated financial statement details - Future Amortization (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
2019 $ 1,864  
2020 4,363  
2021 869  
2022 0  
2023 0  
Net carrying value $ 7,096 $ 13,050