Notes Payable - Schedule of Note Payable Rollforward (Details) - Notes Payable - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Notes Payable [Roll Forward]
Beginning balance	$ 91,150,000	$ 31,105,000
New issuances	57,291,000	194,648,000
Repayments of debt	(31,000)	(1,167,000)
Conversion of debt to equity	(66,678,000)	(123,387,000)
Gain (loss) extinguishments of debt	2,699,000	13,078,000
Fair value adjustments of debt	(34,218,000)	23,028,000
Reclassification of debt between debt categories	0
Other adjustments	(725,000)	(99,000)
Ending balance	49,488,000	91,150,000
Secured SPA Notes
Notes Payable [Roll Forward]
Beginning balance	74,232,000	26,008,000
New issuances	10,701,000	173,730,000
Repayments of debt	0	(1,167,000)
Conversion of debt to equity	(50,691,000)	(114,252,000)
Gain (loss) extinguishments of debt	5,158,000	13,078,000
Fair value adjustments of debt	(33,943,000)	23,165,000
Reclassification of debt between debt categories	0
Other adjustments	0	0
Ending balance	5,457,000	74,232,000
2023 Unsecured SPA Notes
Notes Payable [Roll Forward]
Beginning balance	11,938,000	0
New issuances	0	20,936,000
Repayments of debt	0	0
Conversion of debt to equity	(14,931,000)	(9,135,000)
Gain (loss) extinguishments of debt	(2,394,000)	0
Fair value adjustments of debt	(10,268,000)	(137,000)
Reclassification of debt between debt categories	22,371,000
Other adjustments	0	0
Ending balance	6,716,000	11,938,000
Unsecured Convertible Note
Notes Payable [Roll Forward]
Beginning balance	0
New issuances	34,885,000
Repayments of debt	0
Conversion of debt to equity	0
Gain (loss) extinguishments of debt	(65,000)
Fair value adjustments of debt	328,000
Reclassification of debt between debt categories	(35,148,000)
Other adjustments	0
Ending balance	0	0
Junior Secured SPA Notes
Notes Payable [Roll Forward]
Beginning balance	0
New issuances	9,950,000
Repayments of debt	0
Conversion of debt to equity	(1,056,000)
Gain (loss) extinguishments of debt	0
Fair value adjustments of debt	9,665,000
Reclassification of debt between debt categories	7,500,000
Other adjustments	0
Ending balance	26,059,000	0
2024 Unsecured SPA Notes
Notes Payable [Roll Forward]
Beginning balance	0
New issuances	1,755,000
Repayments of debt	0
Conversion of debt to equity	0
Gain (loss) extinguishments of debt	0
Fair value adjustments of debt	0
Reclassification of debt between debt categories	5,277,000
Other adjustments	0
Ending balance	7,032,000	0
Notes payable – China other
Notes Payable [Roll Forward]
Beginning balance	4,898,000	4,997,000
New issuances		0
Repayments of debt	0	0
Conversion of debt to equity	0	0
Gain (loss) extinguishments of debt	0	0
Fair value adjustments of debt	0	0
Reclassification of debt between debt categories	0
Other adjustments	(725,000)	(99,000)
Ending balance	4,173,000	4,898,000
Auto loans
Notes Payable [Roll Forward]
Beginning balance	82,000	100,000
New issuances	0
New issuances, adjustment		(18,000)
Repayments of debt	(31,000)	0
Conversion of debt to equity	0	0
Gain (loss) extinguishments of debt	0	0
Fair value adjustments of debt	0	0
Reclassification of debt between debt categories	0
Other adjustments	0	0
Ending balance	$ 51,000	$ 82,000