NET LOSS PER SHARE - Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Numerator:
Net loss	$ (745,868)	$ (275,645)	$ (175,563)
Preferred Stock PIK dividend	217,353	30,701	26,368
Net loss attributable to common stockholders, basic	(963,221)	(306,346)	(201,931)
Net loss attributable to common stockholders, diluted	$ (963,221)	$ (306,346)	$ (201,931)
Denominator:
Weighted average common shares outstanding, basic (in shares)	74,970,976	45,238,028	44,902,270
Weighted average common shares outstanding, diluted (in shares)	74,970,976	45,238,028	44,902,270
Net loss per share, basic (in dollars per share)	$ (12.85)	$ (6.77)	$ (4.50)
Net loss per share, diluted (in dollars per share)	$ (12.85)	$ (6.77)	$ (4.50)