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Basis of Presentation and Significant Accounting Policies - Use of Estimates (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Basis of Presentation and Significant Accounting Policies |  |
Contingent liabilities | $ 1,410 | $ 1,410

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- Definition Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer, classified as current. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 55 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=123410239&loc=SL49130611-203046-203046 + Details
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