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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%

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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=6877327&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=118936363&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=118955202&loc=SL82895884-210446 + Details
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