Notes Payable - Schedule of Note Payable Rollforward (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Notes Payable [Roll Forward]
Fair Value Measurement Adjustments	$ 10,097,000	$ 166,000
Debt issuance costs, net	429,000	25,000
Notes Payable
Notes Payable [Roll Forward]
Beginning balance	49,488,000	91,150,000	$ 91,150,000
New Issuances	11,903,000	9,034,000
Repayments of Debt	(6,000)	(10,000)
Conversion of Debt to Equity	(14,845,000)	(8,683,000)
Fair Value Adjustments of Debt	(21,780,000)	(27,721,000)
Other Adjustments	(86,000)	(1,000)
Ending balance	24,674,000	63,769,000	49,488,000
Fair Value Measurement Adjustments	12,429,000		27,399,000
Secured SPA Notes | Notes Payable
Notes Payable [Roll Forward]
Beginning balance	5,457,000	74,232,000	74,232,000
New Issuances	0	1,457,000
Repayments of Debt	0	0
Conversion of Debt to Equity	(589,000)	(8,683,000)
Fair Value Adjustments of Debt	(2,479,000)	(25,118,000)
Other Adjustments	0	0
Ending balance	2,389,000	41,888,000	5,457,000
Fair Value Measurement Adjustments	139,000		2,651,000
2023 Unsecured SPA Notes | Notes Payable
Notes Payable [Roll Forward]
Beginning balance	6,716,000	11,938,000	11,938,000
New Issuances	0	0
Repayments of Debt	0	0
Conversion of Debt to Equity	(4,692,000)	0
Fair Value Adjustments of Debt	(2,024,000)	(2,888,000)
Other Adjustments	0
Ending balance	0	9,050,000	6,716,000
Fair Value Measurement Adjustments			2,844,000
Unsecured Convertible Note | Notes Payable
Notes Payable [Roll Forward]
Beginning balance		0	0
New Issuances		7,577,000
Repayments of Debt		0
Conversion of Debt to Equity		0
Fair Value Adjustments of Debt		285,000
Other Adjustments
Ending balance	0	7,862,000
Junior Secured SPA Notes | Notes Payable
Notes Payable [Roll Forward]
Beginning balance	26,059,000
New Issuances	0
Repayments of Debt	0
Conversion of Debt to Equity	(9,564,000)
Fair Value Adjustments of Debt	(10,435,000)
Other Adjustments	0
Ending balance	6,060,000		26,059,000
2024 Unsecured SPA Notes | Notes Payable
Notes Payable [Roll Forward]
Beginning balance	7,032,000
New Issuances	11,096,000
Repayments of Debt	0
Conversion of Debt to Equity	0
Fair Value Adjustments of Debt	(6,798,000)
Other Adjustments	0
Ending balance	11,330,000		7,032,000
Fair Value Measurement Adjustments	12,279,000		8,741,000
2025 March Unsecured SPA Notes | Notes Payable
Notes Payable [Roll Forward]
Beginning balance	0
New Issuances	807,000
Repayments of Debt	0
Conversion of Debt to Equity	0
Fair Value Adjustments of Debt	(44,000)
Other Adjustments	0
Ending balance	763,000		0
Fair Value Measurement Adjustments	(44,000)
Notes payable – China other | Notes Payable
Notes Payable [Roll Forward]
Beginning balance	4,173,000	4,898,000	4,898,000
New Issuances		0
Repayments of Debt	0	0
Conversion of Debt to Equity	0	0
Fair Value Adjustments of Debt	0	0
Other Adjustments	(41,000)	(1,000)
Ending balance	4,132,000	4,897,000	4,173,000
Fair Value Measurement Adjustments	0		0
Auto loans | Notes Payable
Notes Payable [Roll Forward]
Beginning balance	51,000	82,000	82,000
New Issuances	0	0
Repayments of Debt	(6,000)	(10,000)
Conversion of Debt to Equity	0	0
Fair Value Adjustments of Debt	0	0
Other Adjustments	(45,000)	0
Ending balance	$ 0	$ 72,000	51,000
Fair Value Measurement Adjustments			$ 0