FAIR VALUE MEASUREMENTS - Schedule of Amortized Cost, Unrealized Gains and Losses, and Fair Value of AFS Debt Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Investments:
Amortized Cost	$ 285,495	$ 339,643
Unrealized Gains	2	519
Unrealized Losses	(454)	(64)
Fair Value	285,043	340,098
U.S. government and agency securities
Investments:
Amortized Cost	193,564	266,339
Unrealized Gains	2	444
Unrealized Losses	(188)	(13)
Fair Value	193,378	266,770
Non-U.S. government and agency securities
Investments:
Amortized Cost	9,644	19,958
Unrealized Gains	0	0
Unrealized Losses	(42)	(8)
Fair Value	9,602	19,950
Corporate debt securities
Investments:
Amortized Cost	82,287	36,507
Unrealized Gains	0	69
Unrealized Losses	(224)	(35)
Fair Value	$ 82,063	36,541
Commercial paper
Investments:
Amortized Cost		16,839
Unrealized Gains		6
Unrealized Losses		(8)
Fair Value		$ 16,837