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Balance sheet components - Estimated Future Amortization Expense of Purchased Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]    
2021 (remaining six months) $ 300  
2022 10  
2023 10  
2024 10  
2025 10  
Thereafter 799  
Net Assets $ 1,139 $ 1,468