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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

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