Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Schedule of Allowances for Accounts Receivable (Details)

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Balance Sheet Components - Schedule of Allowances for Accounts Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Allowances - accounts receivable    
Doubtful accounts $ 1,920 $ 1,869
Rental revenue adjustments 1,593 6,078
Sales returns 822 585
Total allowances - accounts receivable $ 4,335 $ 8,532