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Summary of Significant Accounting Policies - Schedule of Allowances for Accounts Receivable (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Allowances - accounts receivable |  |
Doubtful accounts | $ 52 | $ 205
Rental revenue adjustments | 396 | 411
Sales returns | 742 | 1,163
Total allowances - accounts receivable | $ 1,190 | $ 1,779
Doubtful accounts, percentage | 0.20% | 0.60%
Rental revenue adjustments, percentage | 1.30% | 1.10%
Sales returns, percentage | 2.40% | 3.20%
Total allowances - accounts receivable, percentage | 3.90% | 4.90%

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- Definition Amount of allowance for credit loss on accounts receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 + Details
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