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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2024
Fair Value Disclosures [Abstract] |
Schedule of changes in Investments | The change in our investments for the three-month and nine-month periods ended September 30, 2024 and 2023 are as follows:
| Three Months Ended September 30, 2024
| Fair Value Measurements Using
| Quoted Prices in Active Markets for Identical Assets or Liabilities |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs |  |
| (Level 1) |  | (Level 2) |  | (Level 3) |  | Total
| (in thousands)
Investment balance at beginning of period | $ | 13,279 |  |  | $ | — |  |  | $ | 7,148 |  |  | $ | 20,427 |
Purchase of investments | — |  |  | 1,000 |  |  | 21 |  |  | 1,021 |
Reclassification between Level 2 and Level 3 fair value | — |  |  | 350 |  |  | (350) |  |  | — |
Unrealized gain on equity securities | 1,072 |  |  | 38 |  |  | 193 |  |  | 1,303 |
Unrealized loss on embedded option | — |  |  | — |  |  | (553) |  |  | (553) |
Unrealized gain on convertible note, excluding embedded option | — |  |  | — |  |  | 556 |  |  | 556 |
Investment balance at end of period | $ | 14,351 |  |  | $ | 1,388 |  |  | $ | 7,015 |  |  | $ | 22,754 |
| Three Months Ended September 30, 2023
| Fair Value Measurements Using
| Quoted Prices in Active Markets for Identical Assets or Liabilities |  | Significant Unobservable Inputs |  |
| (Level 1) |  | (Level 3) |  | Total
| (in thousands)
Investment balance at beginning of period | $ | 10,199 |  |  | $ | 6,519 |  |  | $ | 16,718 |
Purchase of investments | — |  |  | 100 |  |  | 100 |
Unrealized loss on equity securities | (707) |  |  | — |  |  | (707) |
Unrealized gain on embedded option | — |  |  | 148 |  |  | 148 |
Unrealized gain on convertible note, excluding embedded option | — |  |  | 146 |  |  | 146 |
Investment balance at end of period | $ | 9,492 |  |  | $ | 6,913 |  |  | $ | 16,405 |
| Nine Months Ended September 30, 2024
| Fair Value Measurements Using
| Quoted Prices in Active Markets for Identical Assets or Liabilities |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs |  |
| (Level 1) |  | (Level 2) |  | (Level 3) |  | Total
| (in thousands)
Investment balance at beginning of period | $ | 10,154 |  |  | $ | — |  |  | $ | 7,200 |  |  | $ | 17,354 |
Purchase of investments | — |  |  | 1,000 |  |  | 21 |  |  | 1,021 |
Reclassification between Level 2 and Level 3 fair value | — |  |  | 350 |  |  | (350) |  |  | — |
Unrealized gain on equity securities | 4,197 |  |  | 38 |  |  | 1,070 |  |  | 5,305 |
Unrealized loss on embedded option | — |  |  | — |  |  | (1,714) |  |  | (1,714) |
Unrealized gain on convertible note, excluding embedded option | — |  |  | — |  |  | 788 |  |  | 788 |
Investment balance at end of period | $ | 14,351 |  |  | $ | 1,388 |  |  | $ | 7,015 |  |  | $ | 22,754 |
| Nine Months Ended September 30, 2023 |  |
| Fair Value Measurements Using |  |
| Quoted Prices in Active Markets for Identical Assets or Liabilities |  | Significant Unobservable Inputs |  |  |  |
| (Level 1) |  | (Level 3) |  | Total |  |
| (in thousands)
Investment balance at beginning of period | $ | 8,147 |  |  | $ | 6,139 |  |  | $ | 14,286 |  |  |
Purchase of investments | — |  |  | 350 |  |  | 350 |  |  |
Unrealized gain on equity securities | 1,345 |  |  | — |  |  | 1,345 |  |  |
Unrealized loss on embedded option | — |  |  | (50) |  |  | (50) |  |  |
Unrealized gain on convertible note, excluding embedded option | — |  |  | 474 |  |  | 474 |  |  |
Investment balance at end of period | $ | 9,492 |  |  | $ | 6,913 |  |  | $ | 16,405 |  |  |
Schedule of Recurring Fair Value Measurements | Recurring fair value measurements by valuation hierarchy as of September 30, 2024 and December 31, 2023 are 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 |  | September 30, 2024 |  | (Level 1) |  | (Level 2) |  | (Level 3)
|  | (in thousands)
Investment in Kodiak |  | $ | 13,063 |  |  | $ | 13,063 |  |  | $ | — |  |  | $ | — |
Investment in CarbonFree |  | 6,805 |  |  | — |  |  | — |  |  | 6,805 |
Investment in Standard Lithium |  | 1,288 |  |  | 1,288 |  |  | — |  |  | — |
Investment in KMX Technologies |  | 1,598 |  |  | — |  |  | 1,388 |  |  | 210 |
Total investments |  | $ | 22,754 |  |  |  |  |  |  |
|  |  |  | 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 |  | December 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 |  |  | — |  |  | — |
Investment in KMX Technologies |  | 350 |  |  | — |  |  | — |  |  | 350 |
Investments |  | $ | 17,354 |  |  |  |  |  |  |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2C -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2C Reference 2: 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 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 Reference 4: 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 the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + Details
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