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Balance Sheet Components - Schedule of Inventories, Net (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Inventory Net [Abstract] |  |  |
Finished goods | $ 29,046 | $ 42,402 |
Raw materials | 5,900 | 4,227 |
Gross inventory | 34,946 | 46,629 |
Less: Excess and obsolete provision | (5,892) | (4,959) | $ (3,950)
Inventories, net | $ 29,054 | $ 41,670 |

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