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Balance Sheet Components - Components of Accounts Receivable, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]      
Total receivables $ 54,776 $ 59,208  
Less: Allowance for credit losses (910) (580) $ (503)
Receivables, net 53,866 58,628  
Trade Accounts Receivable      
Accounts Notes And Loans Receivable [Line Items]      
Total receivables 54,322 58,774  
Other Receivables      
Accounts Notes And Loans Receivable [Line Items]      
Total receivables $ 454 $ 434