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Balance sheet components - Estimated Future Amortization Expense of Purchased Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]    
2021 (remaining nine months) $ 446  
2022 10  
2023 10  
2024 10  
2025 10  
Thereafter 794  
Net Assets $ 1,280 $ 1,468