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Balance Sheet Components (Schedule Of Accounts Receivable, Net) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Gross, Current $ 56,985 $ 41,771
Allowance for doubtful accounts (7,294) (6,325)
Accounts Receivable, Net, Current, Total 49,691 35,446
Users [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Gross, Current 42,012 27,340
Advertising [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Gross, Current 11,185 9,452
Others Debtors [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Gross, Current $ 3,788 $ 4,979