Related Party Transactions - Schedule of Related Party Debt Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Related Party Debt Rollforward [Abstract]
Fair value measurement adjustments	$ 3,107	$ 13,283	$ 6,448	$ 23,380
Debt issuance costs	5,497	1,801	6,657	2,230
Related Party
Related Party Debt Rollforward [Abstract]
Beginning balance	4,192	7,123	4,279	8,064
New Issuances		1,212		1,833
Repayments of debt	(59)	(491)	(204)	(615)
Conversion of Debt to Equity		(792)		(1,519)
Gain (loss) on fair value adjustment of debts		449		(215)
Reclassification of Debt Between Debt Categories		0		0
Other Adjustments	68	62	126	15
Ending balance	4,201	7,563	4,201	7,563
Fair value measurement adjustments		1,515		2,767
Debt issuance costs		109		184
Related Party \| 2025 March Unsecured SPA Notes
Related Party Debt Rollforward [Abstract]
Beginning balance		143	0	0
New Issuances		1,212		1,363
Repayments of debt				0
Conversion of Debt to Equity		(792)		(792)
Gain (loss) on fair value adjustment of debts		449		441
Reclassification of Debt Between Debt Categories		451		451
Other Adjustments		0		0
Ending balance	0	1,463	0	1,463
Related Party \| Unsecured SPA Notes
Related Party Debt Rollforward [Abstract]
Beginning balance		451		1,364
New Issuances		0		470
Repayments of debt		0		0
Conversion of Debt to Equity		0		(727)
Gain (loss) on fair value adjustment of debts		0		(656)
Reclassification of Debt Between Debt Categories		(451)		(451)
Other Adjustments		0		0
Ending balance		0		0
Related Party \| Notes Payable — China
Related Party Debt Rollforward [Abstract]
Beginning balance	3,682	4,215	3,775	4,382
New Issuances		0		0
Repayments of debt	(59)	0	(204)	(124)
Conversion of Debt to Equity		0		0
Gain (loss) on fair value adjustment of debts		0		0
Reclassification of Debt Between Debt Categories		0		0
Other Adjustments	62	56	114	13
Ending balance	3,685	4,271	3,685	4,271
Related Party \| Notes Payable on Demand — China
Related Party Debt Rollforward [Abstract]
Beginning balance	435	413	429	417
New Issuances		0		0
Repayments of debt	0	0	0	0
Conversion of Debt to Equity		0		0
Gain (loss) on fair value adjustment of debts		0		0
Reclassification of Debt Between Debt Categories		0		0
Other Adjustments	6	6	12	2
Ending balance	441	419	441	419
Related Party \| Convertible FFGP Note
Related Party Debt Rollforward [Abstract]
Beginning balance		250		250
New Issuances		0		0
Repayments of debt		(165)		(165)
Conversion of Debt to Equity		0		0
Gain (loss) on fair value adjustment of debts		0		0
Reclassification of Debt Between Debt Categories		0		0
Other Adjustments		0		0
Ending balance		85		85
Related Party \| FFGP Note
Related Party Debt Rollforward [Abstract]
Beginning balance		1,576		1,576
New Issuances		0		0
Repayments of debt		(326)		(326)
Conversion of Debt to Equity		0		0
Gain (loss) on fair value adjustment of debts		0		0
Reclassification of Debt Between Debt Categories		0		0
Other Adjustments		0		0
Ending balance		1,250		1,250
Related Party \| Other Notes
Related Party Debt Rollforward [Abstract]
Beginning balance	75	75	75	75
New Issuances		0		0
Repayments of debt	0	0	0	0
Conversion of Debt to Equity		0		0
Gain (loss) on fair value adjustment of debts		0		0
Reclassification of Debt Between Debt Categories		0		0
Other Adjustments	0	0	0	0
Ending balance	$ 75	$ 75	$ 75	$ 75