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Condensed consolidated financial statement details - Future Amortization (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
2020 $ 2,711  
2021 1,152  
Net carrying value 3,910 $ 5,232
Finite-Lived Intangible Assets, Amortization Expense, Year Three $ 47