Fair Value Measurements - Schedule of Changes In Estimated Fair Values of Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025
2026 PIPE Warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 0
Issuance during the period	62,326
Fair value remeasurement	(26,508)
Ending balance	35,818
2025 PIPE Warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	110,881
Fair value remeasurement	(67,969)
Ending balance	42,912
NRA Warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	47,465
Fair value remeasurement	(28,461)
Ending balance	19,004
Second Lien Loans
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	10,872	$ 0
Issuance during the period		29,740
Exchange of SAFE for second lien loan		10,000
Fair value remeasurement	1,153	2,154
Ending balance	12,025	41,894
SAFE
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance		59,301
Issuance during the period		23,660
Exchange of SAFE for second lien loan		(10,000)
Fair value remeasurement		192,548
Ending balance		265,509
Redeemable convertible preferred stock warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	1,619
Issuance during the period		0
Fair value remeasurement		1,298
Ending balance	$ 0	$ 2,917