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Fair Value Measurements - Fair Value Recognition - Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Embedded derivatives |  |  |  |
Reconciliation of the beginning and ending balances of assets measured at fair value using significant unobservable inputs (Level 3) |  |  |  |
Beginning balance | $ 1,575 | $ 2,065 | $ 957 | $ 2,621
Total gain (loss) | (249) | (545) | 369 | (1,101)
Ending balance | 1,326 | 1,520 | 1,326 | 1,520
Change in unrealized gain (loss) included in earnings | $ (249) | (545) | $ 369 | (1,101)
Convertible promissory notes |  |  |  |
Reconciliation of the beginning and ending balances of assets measured at fair value using significant unobservable inputs (Level 3) |  |  |  |
Beginning balance |  | 2,638 |  | 2,372
Total gain (loss) |  | 42 |  | 108
Additions |  | 1,185 |  | 2,936
Equity method investment loss |  | (1,056) |  | (2,607)
Ending balance |  | 2,809 |  | 2,809
Change in unrealized gain (loss) included in other comprehensive income (loss) |  | $ 42 |  | $ 108

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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + 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 (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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