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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2021
Fair Value Disclosures [Abstract] |
Schedule of Estimated Fair Values of Remaining Financial Instruments | The following table provides the estimated fair values of the remaining financial instruments:
|  | As of September 30, 2021 |  | As of December 31, 2020
(in thousands) |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
Financial Instruments: |  |  |  |  |  |  |  |
Highview Investment |  | $ | 552 |  |  | $ | 552 |  |  | $ | 552 |  |  | $ | 552 |
Highview Obligation |  | $ | 226 |  |  | $ | 226 |  |  | $ | 228 |  |  | $ | 228 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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