Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Schedule of Net Accounts Receivable Balance Concentrations by Major Category (Details)

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Balance Sheet Components - Schedule of Net Accounts Receivable Balance Concentrations by Major Category (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]    
Net accounts receivable $ 37,472 $ 31,444
Rental    
Accounts Notes And Loans Receivable [Line Items]    
Net accounts receivable 3,240 4,212
Business To Business And Other Receivables    
Accounts Notes And Loans Receivable [Line Items]    
Net accounts receivable $ 34,232 $ 27,232