Quarterly report pursuant to Section 13 or 15(d)

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

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Balance Sheet Components - Schedule of Gross Accounts Receivable Balance Concentrations by Major Category (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]    
Gross accounts receivable $ 43,593 $ 39,062
Rental    
Accounts Notes And Loans Receivable [Line Items]    
Gross accounts receivable 3,791 3,406
Business To Business And Other Receivables    
Accounts Notes And Loans Receivable [Line Items]    
Gross accounts receivable $ 39,802 $ 35,656