FAIR VALUE MEASUREMENT - Schedule of Changes In Fair Value of the Company's Level 3 Financial Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Puttable Common stock from Exercise of Warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 78,424	$ 79,186
Reclassification of current portion of put liability		(11,356)
Issuance of puttable warrants		0
Termination of put liability	(16,210)
Fair value adjustments	2,229	10,594
Conversion upon IPO	(64,443)
Ending balance	0	78,424
Puttable Warrants Issued with Debt
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	64,188	0
Reclassification of current portion of put liability		0
Issuance of puttable warrants		59,526
Termination of put liability	0
Fair value adjustments	1,172	4,662
Conversion upon IPO	(65,360)
Ending balance	$ 0	$ 64,188