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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Investment | The changes in our investment in CarbonFree for the years ended December 31, 2023, 2022, and 2021 were as follows:
|  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
At beginning of period |  | $ | 6,139 |  |  | $ | 5,000 |  |  | $ | — |
Purchase of CarbonFree convertible note |  | — |  |  | — |  |  | 5,000 |
Change in fair value of embedded option |  | (16) |  |  | 1,211 |  |  | — |
Change in fair value of convertible note, excluding embedded option |  | 727 |  |  | (72) |  |  | — |
At end of period |  | $ | 6,850 |  |  | $ | 6,139 |  |  | $ | 5,000 |
Fair Value, Liabilities Measured on Recurring Basis | A summary of significant recurring fair value measurements by valuation hierarchy as of December 31, 2023 and 2022, is as follows:
|  |  |  | Fair Value Measurements Using
|  | Total as of |  | Quoted Prices in Active Markets for Identical Assets or Liabilities |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs
Description |  | Dec 31, 2023 |  | (Level 1) |  | (Level 2) |  | (Level 3)
|  | (In Thousands)
Investment in CSI Compressco |  | $ | 8,538 |  |  | 8,538 |  |  | — |  |  | — |
Investment in CarbonFree |  | 6,850 |  |  | — |  |  | — |  |  | 6,850 |
Investment in Standard Lithium |  | 1,616 |  |  | 1,616 |  |  | — |  |  | — |
|  |  |  | Fair Value Measurements Using
|  | Total as of |  | Quoted Prices in Active Markets for Identical Assets or Liabilities |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs
Description |  | Dec 31, 2022 |  | (Level 1) |  | (Level 2) |  | (Level 3)
|  | (In Thousands)
Investments in CSI Compressco |  | $ | 6,967 |  |  | 6,967 |  |  | — |  |  | — |
Investments in CarbonFree |  | 6,139 |  |  | — |  |  | — |  |  | 6,139 |
Investments in Standard Lithium |  | 1,180 |  |  | 1,180 |  |  | — |  |  | — |

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- Definition Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//320/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Topic 321 -Publisher FASB -URI https://asc.fasb.org//321/tableOfContent Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Topic 325 -Publisher FASB -URI https://asc.fasb.org//325/tableOfContent + Details
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