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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