CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025		Dec. 31, 2024		Dec. 31, 2023
Cash flows from operating activities
Net loss	$ (745,868)		$ (275,645)		$ (175,563)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	22,026		16,464		8,618
Loss on disposal of property and equipment	3,410		365		1,657
Loss on issuance of convertible preferred stock	379,619		0		0
Stock-based compensation	34,761		12,105		8,961
Warrant expense	6,073		0		0
Non-cash interest expense	2,204		2,161		239
Other	565		308		158
Changes in operating assets and liabilities:
Accounts receivable	(3,595)		34		(968)
Prepaid expenses and other current assets	(662)		6,398		(7,531)
Other assets and liabilities	(10)		10		1,035
Accounts payable, accrued expenses and current liabilities	30,209		6,157		5,718
Operating lease liabilities	(24)		429		(257)
Deferred revenue	3,494		8,553		(82)
Net cash used in operating activities	(267,798)		(222,661)		(158,015)
Cash flows from investing activities
Purchases of property and equipment	(45,447)		(73,509)		(153,240)
Proceeds from sale of property and equipment	1,371		4,703		907
Net cash used in investing activities	(44,076)		(68,806)		(152,333)
Cash flows from financing activities
Proceeds from sale-leaseback transaction	32,658		0		0
Proceeds from initial public offering, net of underwriters discounts and commissions	1,103,327		0		0
Payment of other initial public offering issuance costs	(10,232)		0		0
Proceeds from issuance of promissory note	0		15,501		135,749
Payment of debt issuance costs	0		(191)		(1,165)
Repayment of borrowings	(3,757)		(913)		(973)
Exercise of stock options	5,226		1,652		722
Principal payments on finance lease obligations	(62)		(51)		(4)
Repurchase of common stock	0		(530)		0
Net cash provided by financing activities	1,725,086		339,331		134,329
Effect of currency translation on cash, cash equivalents and restricted cash	28		25		(141)
Increase (decrease) in cash, cash equivalents and restricted cash	1,413,240		47,889		(176,160)
Cash, cash equivalents and restricted cash at beginning of period	302,025		254,136		430,296
Cash, cash equivalents and restricted cash at end of period	1,715,265		302,025		254,136
Supplemental cash flow information
Cash paid for interest	10,873		9,185		112
Cash paid for taxes	168		30		196
Non-cash investing and financing activities:
Right-of-use assets recognized for new leases	1,529		817		736
Right-of-use assets modified for amendments	6		(930)		342
Property and equipment recorded in accounts payable	7,550		8,309		13,011
Stock issuance costs recorded in accounts payable and accrued liabilities	591		10,748		0
Assets received in lieu of cash	0		1,022		0
Asset transferred to held for sale	0		888		425
Series C
Cash flows from financing activities
Proceeds from convertible preferred stock	150,406	[1]	323,987	[1]	0
Payments of convertible preferred stock	(6,951)		(124)		0
Series C-1
Cash flows from financing activities
Proceeds from convertible preferred stock	455,867	[1]	0		0
Payments of convertible preferred stock	$ (1,396)		$ 0		$ 0

[1] Share amounts have been adjusted to reflect the 6.3811681-for-1 forward stock split that became effective on November 3, 2025 in connection with the initial public offering (see Note 1).