Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenues	$ 1,156	$ 900	$ 1,874	$ 1,400
Operating expenses:
Engineering services costs	28,598	21,202	55,802	40,719
General and administrative costs	27,242	17,839	45,626	30,126
Research and development costs	6,393	4,460	13,528	8,711
Depreciation and amortization	11,720	20,392	22,678	40,336
Total operating expenses	73,953	63,893	137,634	119,892
Other income (expense):
Loss on remeasurement of warrant liabilities	(65,032)	(66,140)	(68,238)	(47,926)
Interest expense	(5,657)	(4,936)	(10,393)	(9,332)
Interest income	8,017	2,698	16,213	4,872
Other income (expense), net	308	252	(443)	250
Total other income (expense), net	(62,364)	(68,126)	(62,861)	(52,136)
Loss before income tax expense	(135,161)	(131,119)	(198,621)	(170,628)
Income tax expense	(742)	(231)	(910)	(526)
Net loss before allocation to noncontrolling interest	(135,903)	(131,350)	(199,531)	(171,154)
Net loss attributable to noncontrolling interest	(36,509)	(58,800)	(54,431)	(78,874)
Net loss attributable to common stockholders	$ (99,394)	$ (72,550)	$ (145,100)	$ (92,280)
Weighted-average number of shares
Weighted-average number of shares outstanding - basic	241,985,507	141,185,500	233,101,209	131,316,319
Weighted-average number of shares outstanding - diluted	241,985,507	141,185,500	233,101,209	131,316,319
Common Class A [Member]
Net loss per share attributable to holders of Class A Common Stock
Basic	$ (0.41)	$ (0.51)	$ (0.62)	$ (0.7)
Diluted	$ (0.41)	$ (0.51)	$ (0.62)	$ (0.7)
Weighted-average number of shares
Weighted-average number of shares outstanding - basic	241,571,070	141,185,500	232,892,845	131,316,319
Weighted-average number of shares outstanding - diluted	241,571,070	141,185,500	232,892,845	131,316,319