STOCKHOLDERS' EQUITY AND CONVERTIBLE PREFERRED STOCK - Narrative (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($) vote $ / shares shares		Dec. 31, 2024 USD ($) $ / shares shares		Dec. 31, 2023 USD ($)	Nov. 05, 2025 shares	Nov. 03, 2025 shares
Class of Stock [Line Items]
Combined voting power, percent	0.35
Preferred stock, shares outstanding (in shares)	0		99,565,570			0	133,362,469
Preferred stock, shares authorized (in shares)	50,000,000		109,223,404				141,365,814
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.0001
Preferred stock, shares issued (in shares)	0		99,565,570				133,362,469
Issuance of stock (in shares)	1,548,168		612,592
Preferred Stock PIK dividend | $	$ 217,353		$ 30,701		$ 26,368
Class A common stock
Class of Stock [Line Items]
Number of shares convertible to common stock (in shares)	1
Number of votes for each share (in votes) | vote	1
Class B common stock
Class of Stock [Line Items]
Number of shares convertible to common stock (in shares)	1
Number of votes for each share (in votes) | vote	40
Series B
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)	0		25,416,180				25,416,180
Preferred stock, shares authorized (in shares)	0		30,925,502				30,925,502
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.00002		$ 0.00002
Preferred stock, shares issued (in shares)	0		25,416,180				25,416,180
Preferred Stock PIK dividend | $	$ 55,175
Series C
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)	0		18,060,773				26,445,232
Preferred stock, shares authorized (in shares)	0		22,209,285				26,479,034
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.00002		$ 0.00002
Preferred stock, shares issued (in shares)	0		18,060,773				26,445,232
Issuance of stock (in shares)	8,384,459		18,060,773	[1]
Proceeds from convertible preferred stock | $	$ 150,406	[1]	$ 323,987	[1]	0
Loss on issuance of convertible preferred stock | $	52,025
Preferred Stock PIK dividend | $	$ 63,039
Series C-1
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)	0		0				25,412,440
Preferred stock, shares authorized (in shares)	0		0				27,872,661
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.00002		$ 0.00002
Preferred stock, shares issued (in shares)	0		0				25,412,440
Issuance of stock (in shares)	25,412,440
Proceeds from convertible preferred stock | $	$ 455,867	[1]	$ 0		$ 0
Loss on issuance of convertible preferred stock | $	327,594
Preferred Stock PIK dividend | $	$ 99,139

[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).