Notes Payable - Schedule of Note Payable Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Notes Payable [Roll Forward]
Fair value measurement adjustments	$ 13,283	$ 669	$ 23,380	$ 835
Debt issuance costs	1,801	128	2,230	190
Notes Payable
Notes Payable [Roll Forward]
Beginning balance	24,674	63,769	49,488	91,150
New Issuances	13,787	14,862	25,690	23,896
Repayment of Debt, including periodic interest on debt carried at fair value	0	(8)	(6)	(18)
Conversion of Debt to Equity	(19,207)	(8,122)	(34,052)	(16,805)
Fair Value Adjustments of Debt	8,723	6,912	(13,057)	(20,809)
Other Adjustments	56	(19)	(30)	(20)
Ending balance	28,033	77,394	28,033	77,394
Secured SPA Notes \| Notes Payable
Notes Payable [Roll Forward]
Beginning balance	2,389	41,888	5,457	74,232
New Issuances	0	5,869	0	7,326
Repayment of Debt, including periodic interest on debt carried at fair value	0	0	0	0
Conversion of Debt to Equity	(2,946)	(7,902)	(3,535)	(16,585)
Fair Value Adjustments of Debt	557	2,860	(1,922)	(22,258)
Other Adjustments	0	0	0	0
Ending balance	0	42,715	0	42,715
2023 Unsecured SPA Notes \| Notes Payable
Notes Payable [Roll Forward]
Beginning balance	0	9,050	6,716	11,938
New Issuances	4,500	0	4,500	0
Repayment of Debt, including periodic interest on debt carried at fair value	0		0	0
Conversion of Debt to Equity	0	(220)	(4,692)	(220)
Fair Value Adjustments of Debt	39	1,673	(1,985)	(1,215)
Other Adjustments	0	0	0
Ending balance	4,539	10,503	4,539	10,503
Unsecured Convertible Note \| Notes Payable
Notes Payable [Roll Forward]
Beginning balance		7,862		0
New Issuances		8,993		16,570
Repayment of Debt, including periodic interest on debt carried at fair value		0		0
Conversion of Debt to Equity		0		0
Fair Value Adjustments of Debt	0	2,379	0	2,664
Other Adjustments		0
Ending balance	0	19,234	0	19,234
Junior Secured SPA Notes \| Notes Payable
Notes Payable [Roll Forward]
Beginning balance	6,060	0	26,059
New Issuances	0	0	0
Repayment of Debt, including periodic interest on debt carried at fair value	0	0	0
Conversion of Debt to Equity	(6,904)	0	(16,468)
Fair Value Adjustments of Debt	844	0	(9,591)
Other Adjustments	0	0	0
Ending balance	0	0	0	0
2024 Unsecured SPA Notes \| Notes Payable
Notes Payable [Roll Forward]
Beginning balance	11,330	0	7,032
New Issuances	0	0	11,096
Repayment of Debt, including periodic interest on debt carried at fair value	0	0	0
Conversion of Debt to Equity	(5,847)	0	(5,847)
Fair Value Adjustments of Debt	4,526	0	(2,272)
Other Adjustments		0	0
Ending balance	10,009	0	10,009	0
2025 March Unsecured SPA Notes \| Notes Payable
Notes Payable [Roll Forward]
Beginning balance	763		0
New Issuances	9,287		10,094
Repayment of Debt, including periodic interest on debt carried at fair value	0		0
Conversion of Debt to Equity	(3,510)		(3,510)
Fair Value Adjustments of Debt	2,757		2,713
Other Adjustments	0		0
Ending balance	9,297		9,297
Notes payable – China other \| Notes Payable
Notes Payable [Roll Forward]
Beginning balance	4,132	4,897	4,173	4,898
New Issuances	0	0		0
Repayment of Debt, including periodic interest on debt carried at fair value	0	0	0	0
Conversion of Debt to Equity	0	0	0	0
Fair Value Adjustments of Debt	0	0	0	0
Other Adjustments	56	(19)	15	(20)
Ending balance	4,188	4,878	4,188	4,878
Auto loans \| Notes Payable
Notes Payable [Roll Forward]
Beginning balance		72	51	82
New Issuances		0	0	0
Repayment of Debt, including periodic interest on debt carried at fair value		(8)	(6)	(18)
Conversion of Debt to Equity		0	0	0
Fair Value Adjustments of Debt		0	0	0
Other Adjustments		0	(45)	0
Ending balance	$ 0	$ 64	$ 0	$ 64

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Debt Instrument, Other Adjustment Amount

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Debt Issuance Costs

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Fair Value, Option, Aggregate Differences, Reduction, Long-Term Debt Instruments

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Gain (Loss) On Fair Value Adjustment Of Debts

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Notes Payable

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- Definition

Amount of principal of debt issued.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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Including the current and noncurrent portions, carrying value as of the balance sheet date of all notes and loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/1943274/2147479886/946-10-S99-3

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