Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
Balance Sheet Components - Schedule of Allowances for Accounts Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Allowances - accounts receivable    
Doubtful accounts $ 1,205 $ 1,415
Rental revenue adjustments 869 947
Sales returns 1,333 904
Total allowances - accounts receivable $ 3,407 $ 3,266