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
Jun. 30, 2019
Dec. 31, 2018
Allowances - accounts receivable    
Doubtful accounts $ 450 $ 693
Rental revenue adjustments 473 438
Sales returns 1,304 890
Total allowances - accounts receivable $ 2,227 $ 2,021