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, 2021
Dec. 31, 2020
Allowances - accounts receivable    
Doubtful accounts $ 52 $ 52
Rental revenue adjustments   396
Sales returns 810 742
Total allowances - accounts receivable $ 862 $ 1,190
Doubtful accounts, percentage 0.20% 0.20%
Rental revenue adjustments, percentage 0.00% 1.30%
Sales returns, percentage 3.10% 2.40%
Total allowances - accounts receivable, percentage 3.30% 3.90%