Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Schedule of Allowances for Accounts Receivable (Details)

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Summary of Significant Accounting Policies - Schedule of Allowances for Accounts Receivable (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Allowances - accounts receivable    
Doubtful accounts $ 205 $ 693
Rental revenue adjustments 411 438
Sales returns 1,163 890
Total allowances - accounts receivable $ 1,779 $ 2,021
Doubtful accounts, percentage 0.60% 1.80%
Rental revenue adjustments, percentage 1.10% 1.10%
Sales returns, percentage 3.20% 2.30%
Total allowances - accounts receivable, percentage 4.90% 5.20%