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, 2020
Dec. 31, 2019
Allowances - accounts receivable    
Doubtful accounts $ 141 $ 205
Rental revenue adjustments 544 411
Sales returns 668 1,163
Total allowances - accounts receivable $ 1,353 $ 1,779