NET LOSS PER SHARE - Schedule of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Earnings Per Share [Abstract]
Net loss	$ (539,432)	$ (643,390)	$ (905,603)	$ (1,324,249)
Accretion of redeemable convertible preferred stock (related party)	(199,823)	(146,861)	(564,748)	(150,762)
Net loss attributable to common stockholders, basic	(739,255)	(790,251)	(1,470,351)	(1,475,011)
Interest expense on 2026 Notes	309	0	4,283	0
Gain on extinguishment of debt	(116,360)	0	(116,360)	0
Net loss attributable to common stockholders, diluted	$ (855,306)	$ (790,251)	$ (1,582,428)	$ (1,475,011)
Weighted-average shares outstanding, basic (in shares)	3,056,404,834	2,310,360,525	3,046,411,837	2,306,209,050
Dilutive effect of 2026 Notes, using if-converted method (in shares)	1,477,890	0	10,296,242	0
Weighted-average shares outstanding, diluted (in shares)	3,057,882,724	2,310,360,525	3,056,708,079	2,306,209,050
Net loss per share:
Basic (in dollars per share)	$ (0.24)	$ (0.34)	$ (0.48)	$ (0.64)
Diluted (in dollars per share)	$ (0.28)	$ (0.34)	$ (0.52)	$ (0.64)