CASH EQUIVALENTS, RESTRICTED CASH AND MARKETABLE SECURITIES - Schedule of Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,232,294	$ 1,539,785
Gross Unrealized Gains	3,076	2,451
Gross Unrealized Losses	(157)	(2,346)
Fair Value	1,235,213	1,539,890
Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	159,169	191,410
Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	1,076,044	1,253,480
Restricted Cash
Debt Securities, Available-for-sale [Line Items]
Fair Value		95,000
Money market funds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	144,482	191,410
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	144,482	191,410
Money market funds \| Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	144,482	191,410
Money market funds \| Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
Money market funds \| Restricted Cash
Debt Securities, Available-for-sale [Line Items]
Fair Value		0
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	24,174	125,087
Gross Unrealized Gains	14	13
Gross Unrealized Losses	(1)	(8)
Fair Value	24,187	125,092
Certificates of deposit \| Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
Certificates of deposit \| Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	24,187	30,092
Certificates of deposit \| Restricted Cash
Debt Securities, Available-for-sale [Line Items]
Fair Value		95,000
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	40,178	30,681
Gross Unrealized Gains	10	40
Gross Unrealized Losses	(4)	(8)
Fair Value	40,184	30,713
Commercial paper \| Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	14,687	0
Commercial paper \| Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	25,497	30,713
Commercial paper \| Restricted Cash
Debt Securities, Available-for-sale [Line Items]
Fair Value		0
Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	399,026	449,612
Gross Unrealized Gains	1,610	1,115
Gross Unrealized Losses	(41)	(1,157)
Fair Value	400,595	449,570
Corporate notes and bonds \| Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
Corporate notes and bonds \| Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	400,595	449,570
Corporate notes and bonds \| Restricted Cash
Debt Securities, Available-for-sale [Line Items]
Fair Value		0
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	39,996	111,606
Gross Unrealized Gains	0	42
Gross Unrealized Losses	0	(36)
Fair Value	39,996	111,612
U.S. Treasuries \| Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
U.S. Treasuries \| Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	39,996	111,612
U.S. Treasuries \| Restricted Cash
Debt Securities, Available-for-sale [Line Items]
Fair Value		0
U.S. Government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	584,438	631,389
Gross Unrealized Gains	1,442	1,241
Gross Unrealized Losses	(111)	(1,137)
Fair Value	585,769	631,493
U.S. Government agency securities \| Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
U.S. Government agency securities \| Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 585,769	631,493
U.S. Government agency securities \| Restricted Cash
Debt Securities, Available-for-sale [Line Items]
Fair Value		$ 0

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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