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Fair Value Measurements - Fair Value Recognition - Assets (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Reconciliation of the beginning and ending balances of assets measured at fair value using significant unobservable inputs (Level 3)        
Change in unrealized gain (loss) included in other comprehensive income (loss) $ 38,000 $ (14,000) $ 96,000 $ (80,000)
Embedded derivatives        
Reconciliation of the beginning and ending balances of assets measured at fair value using significant unobservable inputs (Level 3)        
Beginning balance 2,065,000 5,252,000 2,621,000 4,628,000
Total gain (loss) (545,000) (816,000) (1,101,000) (192,000)
Ending balance 1,520,000 4,436,000 1,520,000 4,436,000
Change in unrealized gain (loss) included in earnings (545,000) (816,000) (1,101,000) (192,000)
Convertible promissory notes        
Reconciliation of the beginning and ending balances of assets measured at fair value using significant unobservable inputs (Level 3)        
Beginning balance 2,638,000 4,744,000 2,372,000 2,330,000
Total gain (loss) 42,000   108,000 (53,000)
Purchases 1,185,000 2,072,000 2,936,000 5,727,000
Equity method investment loss (1,056,000) (1,356,000) (2,607,000) (2,544,000)
Ending balance 2,809,000 $ 5,460,000 2,809,000 5,460,000
Change in unrealized gain (loss) included in other comprehensive income (loss) $ 42,000   $ 108,000 $ (53,000)