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
Mar. 31, 2016
Dec. 31, 2015
Allowances - accounts receivable    
Doubtful accounts $ 2,021 $ 1,664
Rental revenue adjustments 4,761 4,115
Sales returns 741 366
Total allowances - accounts receivable $ 7,523 $ 6,145