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Balance Sheet Information - Notes Receivable (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable $ 519 $ 3,867
Current portion of notes receivable 519 3,867
Reserve against current portion of notes receivable 0 (3,355)
Notes receivable, net 519 512
Yonder Media Mobile    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable 0 3,355
ValidSoft Ltd    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable $ 519 $ 512