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, 2019
Dec. 31, 2018
Allowances - accounts receivable    
Doubtful accounts $ 424 $ 693
Rental revenue adjustments 548 438
Sales returns 1,096 890
Total allowances - accounts receivable $ 2,068 $ 2,021