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Fair Value Measurements - Fair Value Recognition - Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Embedded derivatives |  |  |  |
Reconciliation of the beginning and ending balances of assets measured at fair value using significant unobservable inputs (Level 3) |  |  |  |
Beginning balance | $ 1,520 | $ 4,436 | $ 2,621 | $ 4,628
Total gain (loss) | (319) | (1,416) | (1,420) | (1,608)
Ending balance | 1,201 | 3,020 | 1,201 | 3,020
Change in unrealized gain (loss) included in earnings | (319) | (1,416) | (1,420) | (1,608)
Convertible promissory notes |  |  |  |
Reconciliation of the beginning and ending balances of assets measured at fair value using significant unobservable inputs (Level 3) |  |  |  |
Beginning balance | 2,809 | 5,460 | 2,372 | 2,330
Settlements, net | (2,210) |  | (2,210) |
Total gain (loss) | 3 | 198 | 111 | 145
Purchases | 1,009 | 2,212 | 3,946 | 7,939
Equity method investment loss | (1,087) | (1,850) | (3,695) | (4,394)
Ending balance | 524 | 6,020 | 524 | 6,020
Change in unrealized gain (loss) included in earnings | 313 |  | 313 |
Change in unrealized gain (loss) included in other comprehensive income (loss) | $ 3 | $ 198 | $ 111 | $ 145

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 102 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-102 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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