Condensed Consolidated Statements of Operations and Comprehensive (Loss) Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Revenues	$ 3,499	$ 503	$ 5,329	$ 1,974
Operating expenses:
Research and development	22,702	12,218	40,252	22,352
General and administrative	12,439	7,161	24,859	12,286
Truck and freight operations	10,649	5,470	18,954	9,475
Sales and marketing	1,386	1,001	2,792	1,807
Total operating expenses	47,176	25,850	86,857	45,920
Loss from operations	(43,677)	(25,347)	(81,528)	(43,946)
Other income (expenses):
Interest expense	(909)	(1,160)	(1,805)	(2,424)
Interest income and other, net	(524)	294	525	463
Change in fair value of second lien loans	(679)	(2,154)	(1,153)	(2,154)
Change in fair value of simple agreements for future equity	0	(84,173)	0	(192,548)
Total other income (expenses), net	56,168	(88,376)	120,505	(197,961)
Net (loss) income before income taxes	12,491	(113,723)	38,977	(241,907)
Income tax expense	(14)	(3)	(10)	(4)
Net (loss) income	12,477	(113,726)	38,967	(241,911)
Unrealized losses on marketable securities, net of tax	(116)	0	(140)	0
Comprehensive (loss) income	12,361	(113,726)	38,827	(241,911)
Net income	12,477	(113,726)	38,967	(241,911)
Less: cumulative dividends to preferred stockholders	(50,152)	0	(54,433)	0
Net loss attributable to common stockholders, basic	$ (37,675)	$ (113,726)	$ (15,466)	$ (241,911)
Net loss per common share, basic (in dollars per share)	$ (0.20)	$ (1.89)	$ (0.09)	$ (4.05)
Net loss per common share, diluted (in dollars per share)	$ (0.50)	$ (1.89)	$ (0.73)	$ (4.05)
Weighted-average common shares outstanding, basic (in shares)	187,241	60,197	181,825	59,720
Weighted-average common shares outstanding, diluted (in shares)	193,203	60,197	188,886	59,720
Common stock warrants
Other income (expenses):
Change in fair value of warrants	$ 58,280	$ 0	$ 122,938	$ 0
Redeemable convertible preferred stock warrants
Other income (expenses):
Change in fair value of warrants	$ 0	$ (1,183)	$ 0	$ (1,298)