Summary of Significant Accounting Policies - Schedule of Allowances for Accounts Receivable (Details) - USD ($) $ in Thousands |
12 Months Ended | |
---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
|
Allowances - accounts receivable | ||
Doubtful accounts | $ 693 | $ 1,415 |
Rental revenue adjustments | 438 | 947 |
Sales returns | 890 | 904 |
Total allowances - accounts receivable | $ 2,021 | $ 3,266 |
Doubtful accounts, percentage | 1.80% | 4.10% |
Rental revenue adjustments, percentage | 1.10% | 2.70% |
Sales returns, percentage | 2.30% | 2.60% |
Total allowances - accounts receivable, percentage | 5.20% | 9.40% |