STOCK‐BASED COMPENSATION - Restricted Stock Units Activity (Details) - $ / shares	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
RSUs
Number of Options
Unvested (in shares)	19,844,438
Granted (in shares)	12,312,860
Forfeited (in shares)	(227,268)
Vested and released (in shares)	(180,074)
Vested but unreleased (in shares)	(1,712,195)
Unvested (in shares)	30,037,761
Vested but unreleased (in shares)	1,905,543
Outstanding (in shares)	31,943,304
Weighted-Average Exercise Price
Unvested (in dollars per share)	$ 33.27
Granted (in dollars per share)	7.12	$ 38.60
Forfeited (in dollars per share)	30.25
Vested and released (in dollars per share)	33.46
Vested but unreleased (in dollars per share)	28.92
Unvested (in dollars per share)	23.33
Vested but unreleased (in dollars per share)	29.60
Outstanding (in dollars per share)	$ 23.24
Stock Price Target and GMS Performance RSUs
Number of Options
Unvested (in shares)	12,410,483
Granted (in shares)	0
Forfeited (in shares)	0
Vested and released (in shares)	0
Vested but unreleased (in shares)	0
Unvested (in shares)	12,410,483
Vested but unreleased (in shares)	193,348
Outstanding (in shares)	12,603,831
Weighted-Average Exercise Price
Unvested (in dollars per share)	$ 30.81
Granted (in dollars per share)	0
Forfeited (in dollars per share)	0
Vested and released (in dollars per share)	0
Vested but unreleased (in dollars per share)	0
Unvested (in dollars per share)	30.81
Vested but unreleased (in dollars per share)	35.69
Outstanding (in dollars per share)	$ 30.88
Other RSUs
Number of Options
Unvested (in shares)	7,433,955
Granted (in shares)	12,312,860
Forfeited (in shares)	(227,268)
Vested and released (in shares)	(180,074)
Vested but unreleased (in shares)	(1,712,195)
Unvested (in shares)	17,627,278
Vested but unreleased (in shares)	1,712,195
Outstanding (in shares)	19,339,473
Weighted-Average Exercise Price
Unvested (in dollars per share)	$ 37.38
Granted (in dollars per share)	7.12
Forfeited (in dollars per share)	30.25
Vested and released (in dollars per share)	33.46
Vested but unreleased (in dollars per share)	28.92
Unvested (in dollars per share)	18.07
Vested but unreleased (in dollars per share)	28.92
Outstanding (in dollars per share)	$ 18.26