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Fair Value Measurements (Details) $ in Thousands | Sep. 30, 2021 USD ($) numberOfFinancialInstitutions | Dec. 31, 2020 USD ($) numberOfFinancialInstitutions
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Highview Investment | $ 552 | $ 552
Recurring Basis |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Number of instruments held | numberOfFinancialInstitutions | 0 | 0
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Highview Investment | $ 552 | $ 552
Highview Obligation | 226 | 228
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Highview Investment | 552 | 552
Highview Obligation | $ 226 | $ 228

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