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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Schedule of Financial Assets Subject to Fair Value Measurements on a Recurring Basis by Level Within the Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents, amortized cost | $ 1,893,638 | $ 1,369,947
Long-term investments | 555,521 | 461,029
Short-term investments | 1,578,283 | 2,489,798
Related Party |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 15,000 | 0
Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents, amortized cost | 1,893,638 | 1,369,947
Gross Unrealized Gains | 8,873 | 3,869
Gross Unrealized Losses | (105) | (2,772)
Long-term investments | 555,521 | 461,029
Total, amortized cost | 4,018,674 | 4,319,677
Total, estimated fair value | 4,027,442 | 4,320,774
Short-term investments | 1,578,283 | 2,489,798
Fair Value, Recurring | Cash |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents, amortized cost | 755,638 | 516,673
Cash, estimated fair value | 755,638 | 516,673
Long-term investments | 0 | 0
Short-term investments | 0 | 0
Fair Value, Recurring | Level 1: |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents, amortized cost | 1,043,539 | 803,274
Amortized cost | 2,537,605 | 2,732,413
Gross Unrealized Gains | 6,453 | 2,480
Gross Unrealized Losses | (91) | (2,073)
Estimated Fair Value | 2,543,967 | 2,732,820
Long-term investments | 436,379 | 291,009
Short-term investments | 1,064,049 | 1,638,537
Fair Value, Recurring | Level 2: |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents, amortized cost | 94,461 | 50,000
Amortized cost | 725,431 | 1,070,591
Gross Unrealized Gains | 2,420 | 1,389
Gross Unrealized Losses | (14) | (699)
Estimated Fair Value | 727,837 | 1,071,281
Long-term investments | 119,142 | 170,020
Short-term investments | 514,234 | 851,261
Fair Value, Recurring | Money market funds | Level 1: |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents, amortized cost | 743,253 | 698,702
Amortized cost | 743,253 | 698,702
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 743,253 | 698,702
Long-term investments | 0 | 0
Short-term investments | 0 | 0
Fair Value, Recurring | U.S. Treasury securities | Level 1: |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents, amortized cost | 300,286 | 104,572
Amortized cost | 1,794,352 | 2,033,711
Gross Unrealized Gains | 6,453 | 2,480
Gross Unrealized Losses | (91) | (2,073)
Estimated Fair Value | 1,800,714 | 2,034,118
Long-term investments | 436,379 | 291,009
Short-term investments | 1,064,049 | 1,638,537
Fair Value, Recurring | Certificates of deposit | Level 2: |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents, amortized cost | 3,002 | 0
Amortized cost | 3,000 | 105,993
Gross Unrealized Gains | 2 | 97
Gross Unrealized Losses | 0 | (22)
Estimated Fair Value | 3,002 | 106,068
Long-term investments | 0 | 0
Short-term investments | 0 | 106,068
Fair Value, Recurring | Time Deposits | Level 2: |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents, amortized cost | 60,000 | 50,000
Amortized cost | 305,000 | 50,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 305,000 | 50,000
Long-term investments | 0 | 0
Short-term investments | 245,000 | 0
Fair Value, Recurring | Time Deposits | Level 2: | Related Party |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 15,000 |
Fair Value, Recurring | Commercial paper | Level 2: |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents, amortized cost | 24,299 | 0
Amortized cost | 72,321 | 299,248
Gross Unrealized Gains | 48 | 191
Gross Unrealized Losses | (1) | (8)
Estimated Fair Value | 72,368 | 299,431
Long-term investments | 0 | 0
Short-term investments | 48,069 | 299,431
Fair Value, Recurring | Corporate debt securities | Level 2: |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents, amortized cost | 7,160 | 0
Amortized cost | 345,110 | 615,350
Gross Unrealized Gains | 2,370 | 1,101
Gross Unrealized Losses | (13) | (669)
Estimated Fair Value | 347,467 | 615,782
Long-term investments | 119,142 | 170,020
Short-term investments | $ 221,165 | $ 445,762

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