Related Party Transactions - Schedule of Related Party Debt Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Related Party Debt Rollforward [Abstract]
Fair value measurement adjustments	$ (3,130)	$ 7,467	$ 20,250	$ 8,302
Debt issuance costs	3,063	681	5,293	871
Related Party
Related Party Debt Rollforward [Abstract]
Beginning balance	7,563	15,159	8,064	9,760
New Issuances	72	75	1,905	3,074
Repayments of Debt	(1,925)		(2,540)	0
Conversion of Debt to Equity			(1,519)	(435)
Fair Value Adjustments of Debt	(263)	(649)	(478)	(304)
Reclassification of Debt Between Debt Categories			0
Other Adjustments	29	129	44	2,619
Ending balance	5,476	14,714	5,476	14,714
Fair value measurement adjustments	58		2,825	835
Debt issuance costs	5		189
2025 March Unsecured SPA Notes | Related Party
Related Party Debt Rollforward [Abstract]
Beginning balance	1,463		0
New Issuances	72		1,435
Repayments of Debt			0
Conversion of Debt to Equity			(792)
Fair Value Adjustments of Debt	(263)		178
Reclassification of Debt Between Debt Categories			451
Other Adjustments	0		0
Ending balance	1,272		1,272
Unsecured Convertible Note | Related Party
Related Party Debt Rollforward [Abstract]
Beginning balance		1,951	1,364
New Issuances		0	470
Repayments of Debt			0
Conversion of Debt to Equity			(727)
Fair Value Adjustments of Debt	0	(649)	(656)	(200)
Reclassification of Debt Between Debt Categories			(451)
Other Adjustments		0	0
Ending balance	0	1,302	0	1,302
2023 Unsecured Convertible Note | Related Party
Related Party Debt Rollforward [Abstract]
Beginning balance				542
New Issuances				0
Repayments of Debt				0
Conversion of Debt to Equity				(435)
Fair Value Adjustments of Debt				(107)
Other Adjustments				0
Ending balance		0		0
Unsecured SPA Notes | Related Party
Related Party Debt Rollforward [Abstract]
Beginning balance				0
New Issuances				1,499
Repayments of Debt				0
Conversion of Debt to Equity				0
Fair Value Adjustments of Debt				(197)
Other Adjustments				0
Ending balance		1,302		1,302
Notes Payable — China | Related Party
Related Party Debt Rollforward [Abstract]
Beginning balance	4,271	7,577	4,382	5,103
New Issuances	0	0	0	0
Repayments of Debt	(590)		(714)	0
Conversion of Debt to Equity			0	0
Fair Value Adjustments of Debt	0	0	0	0
Reclassification of Debt Between Debt Categories			0
Other Adjustments	27	129	40	2,603
Ending balance	3,708	7,706	3,708	7,706
Notes Payable on Demand — China | Related Party
Related Party Debt Rollforward [Abstract]
Beginning balance	419	3,805	417	3,789
New Issuances	0	0	0	0
Repayments of Debt	0		0	0
Conversion of Debt to Equity			0	0
Fair Value Adjustments of Debt	0	0	0	0
Reclassification of Debt Between Debt Categories			0
Other Adjustments	2		4	16
Ending balance	421	3,805	421	3,805
Convertible FFGP Note | Related Party
Related Party Debt Rollforward [Abstract]
Beginning balance	85	250	250	0
New Issuances	0	0	0	250
Repayments of Debt	(85)		(250)	0
Conversion of Debt to Equity			0	0
Fair Value Adjustments of Debt	0	0	0	0
Reclassification of Debt Between Debt Categories			0
Other Adjustments	0	0	0	0
Ending balance	0	250	0	250
FFGP Note | Related Party
Related Party Debt Rollforward [Abstract]
Beginning balance	1,250	1,576	1,576	326
New Issuances	0	0	0	1,250
Repayments of Debt	(1,250)		(1,576)	0
Conversion of Debt to Equity			0	0
Fair Value Adjustments of Debt	0	0	0	0
Reclassification of Debt Between Debt Categories			0
Other Adjustments	0	0	0	0
Ending balance	0	1,576	0	1,576
Other Notes | Related Party
Related Party Debt Rollforward [Abstract]
Beginning balance	75	0	75
New Issuances	0	75	0
Repayments of Debt	0		0	0
Conversion of Debt to Equity			0	0
Fair Value Adjustments of Debt	0	0	0
Reclassification of Debt Between Debt Categories			0
Other Adjustments	0	0	0
Ending balance	$ 75	$ 75	$ 75	$ 75