Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenues	$ 0	$ 13,825
Cost of sales (exclusive of items shown separately below)	0	6,714
Gross profit	0	7,111
Operating expenses:
Engineering services costs	78,811	54,212
General and administrative costs	41,601	48,332
Research and development costs	47,486	45,620
Depreciation and amortization	54,469	4,711
Total operating expenses	222,367	152,875
Other income (expense):
Gain on remeasurement of warrant liabilities	8,986	19,114
Interest income (expense), net	2,675	2,633
Other (expense) income, net	(10,290)	21,521
Total other income (expense), net	1,371	43,268
Loss before income tax expense	(220,996)	(102,496)
Income tax expense	(1,681)	(617)
Net loss before allocation to noncontrolling interest	(222,677)	(103,113)
Net loss attributable to the noncontrolling interest	(135,116)	(71,473)
Net loss attributable to common stockholders	$ (87,561)	$ (31,640)
Common Class A [Member]
Net loss per share attributable to holders of Class A Common Stock
Basic	$ (1.07)	$ (0.58)
Diluted	$ (1.07)	$ (0.58)
Weighted average shares of Class A Common Stock outstanding
Weighted-average shares of Class A Common Stock outstanding - basic	81,824,122	54,437,073
Weighted-average shares of Class A Common Stock outstanding - diluted	81,824,122	54,437,073