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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