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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of changes in Investments | The change in our investments for the three-month and six-month periods ended June 30, 2024 and 2023 are as follows:
| Three Months Ended June 30, 2024
| 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 | $ | 13,148 |  |  | $ | 7,238 |  |  | $ | 20,386 |
Unrealized gain on equity securities | 131 |  |  | — |  |  | 131 |
Unrealized loss on embedded option | — |  |  | (85) |  |  | (85) |
Unrealized loss on convertible note, excluding embedded option | — |  |  | (5) |  |  | (5) |
Investment balance at end of period | $ | 13,279 |  |  | $ | 7,148 |  |  | $ | 20,427 |
| Three Months Ended June 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 | $ | 7,963 |  |  | $ | 5,939 |  |  | $ | 13,902 |
Purchase of investments | — |  |  | 250 |  |  | 250 |
Unrealized gain on equity securities | 2,236 |  |  | — |  |  | 2,236 |
Unrealized gain on embedded option | — |  |  | 123 |  |  | 123 |
Unrealized gain on convertible note, excluding embedded option | — |  |  | 207 |  |  | 207 |
Investment balance at end of period | $ | 10,199 |  |  | $ | 6,519 |  |  | $ | 16,718 |
| Six Months Ended June 30, 2024 |  |
| 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 | $ | 10,154 |  |  | $ | 7,200 |  |  | $ | 17,354 |  |  |
Unrealized gain on equity securities | 3,125 |  |  | — |  |  | 3,125 |  |  |
Unrealized loss on embedded option | — |  |  | (284) |  |  | (284) |  |  |
Unrealized gain on convertible note, excluding embedded option | — |  |  | 232 |  |  | 232 |  |  |
Investment balance at end of period | $ | 13,279 |  |  | $ | 7,148 |  |  | $ | 20,427 |  |  |
| Six Months Ended June 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 | — |  |  | 250 |  |  | 250 |  |  |
Unrealized gain on equity securities | 2,052 |  |  | — |  |  | 2,052 |  |  |
Unrealized loss on embedded option | — |  |  | (198) |  |  | (198) |  |  |
Unrealized gain on convertible note, excluding embedded option | — |  |  | 328 |  |  | 328 |  |  |
Investment balance at end of period | $ | 10,199 |  |  | $ | 6,519 |  |  | $ | 16,718 |  |  |
Schedule of Recurring Fair Value Measurements | Recurring fair value measurements by valuation hierarchy as of June 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 |  | June 30, 2024 |  | (Level 1) |  | (Level 2) |  | (Level 3)
|  | (in thousands)
Investment in Kodiak |  | $ | 12,279 |  |  | $ | 12,279 |  |  | $ | — |  |  | $ | — |
Investment in CarbonFree |  | 6,798 |  |  | — |  |  | — |  |  | 6,798 |
Investment in Standard Lithium |  | 1,000 |  |  | 1,000 |  |  | — |  |  | — |
Other investments |  | 350 |  |  | — |  |  | — |  |  | 350 |
Total investments |  | $ | 20,427 |  |  |  |  |  |  |
|  |  |  | 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 |  |  | — |  |  | — |
Other investments |  | 350 |  |  | — |  |  | — |  |  | 350 |
Investments |  | $ | 17,354 |  |  |  |  |  |  |

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