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FAIR VALUE MEASUREMENTS - Schedule of Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair value measurements |  |
Equity securities | $ 2,586 | $ 3,841
Non-marketable securities | 6,560 | 7,650
Contingent consideration | 294,260 | 288,657
Contingent consideration | (21,700) |
Fair Value, Recurring |  |
Fair value measurements |  |
Restricted cash (1) | 4,297 | 4,297
Equity securities | 2,586 | 3,841
Non-marketable securities | 6,560 | 7,650
Contingent consideration |  | 288,657
Contingent consideration | (294,260) |
Total | 368,690 | 500,934
Fair Value, Recurring | Corporate bonds |  |
Fair value measurements |  |
Estimated Fair Value | 140,845 | 55,828
Fair Value, Recurring | Commercial paper |  |
Fair value measurements |  |
Estimated Fair Value | 8,712 | 20,984
Fair Value, Recurring | U.S. government agency securities |  |
Fair value measurements |  |
Estimated Fair Value | 81,713 | 56,716
Fair Value, Recurring | Asset backed securities |  |
Fair value measurements |  |
Estimated Fair Value | 70,750 | 34,897
Fair Value, Recurring | Cash and money market |  |
Fair value measurements |  |
Cash and cash equivalents, fair value | 329,357 | 530,100
Fair Value, Recurring | U.S. government agency securities |  |
Fair value measurements |  |
Cash and cash equivalents, fair value | 18,130 | 3,035
Fair Value, Recurring | Commercial paper |  |
Fair value measurements |  |
Cash and cash equivalents, fair value |  | 72,243
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring |  |
Fair value measurements |  |
Restricted cash (1) | 4,297 | 4,297
Equity securities | 2,586 | 3,841
Non-marketable securities | 0 | 0
Contingent consideration |  | 0
Contingent consideration | 0 |
Total | 336,240 | 538,238
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | Corporate bonds |  |
Fair value measurements |  |
Estimated Fair Value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | Commercial paper |  |
Fair value measurements |  |
Estimated Fair Value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | U.S. government agency securities |  |
Fair value measurements |  |
Estimated Fair Value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | Asset backed securities |  |
Fair value measurements |  |
Estimated Fair Value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | Cash and money market |  |
Fair value measurements |  |
Cash and cash equivalents, fair value | 329,357 | 530,100
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | U.S. government agency securities |  |
Fair value measurements |  |
Cash and cash equivalents, fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | Commercial paper |  |
Fair value measurements |  |
Cash and cash equivalents, fair value |  | 0
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring |  |
Fair value measurements |  |
Restricted cash (1) | 0 | 0
Equity securities | 0 | 0
Non-marketable securities | 0 | 0
Contingent consideration |  | 0
Contingent consideration | 0 |
Total | 320,150 | 243,703
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Corporate bonds |  |
Fair value measurements |  |
Estimated Fair Value | 140,845 | 55,828
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Commercial paper |  |
Fair value measurements |  |
Estimated Fair Value | 8,712 | 20,984
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | U.S. government agency securities |  |
Fair value measurements |  |
Estimated Fair Value | 81,713 | 56,716
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Asset backed securities |  |
Fair value measurements |  |
Estimated Fair Value | 70,750 | 34,897
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Cash and money market |  |
Fair value measurements |  |
Cash and cash equivalents, fair value | 0 | 0
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | U.S. government agency securities |  |
Fair value measurements |  |
Cash and cash equivalents, fair value | 18,130 | 3,035
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Commercial paper |  |
Fair value measurements |  |
Cash and cash equivalents, fair value |  | 72,243
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring |  |
Fair value measurements |  |
Restricted cash (1) | 0 | 0
Equity securities | 0 | 0
Non-marketable securities | 6,560 | 7,650
Contingent consideration |  | 288,657
Contingent consideration | (294,260) |
Total | (287,700) | (281,007)
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Corporate bonds |  |
Fair value measurements |  |
Estimated Fair Value | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Commercial paper |  |
Fair value measurements |  |
Estimated Fair Value | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | U.S. government agency securities |  |
Fair value measurements |  |
Estimated Fair Value | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Asset backed securities |  |
Fair value measurements |  |
Estimated Fair Value | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Cash and money market |  |
Fair value measurements |  |
Cash and cash equivalents, fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | U.S. government agency securities |  |
Fair value measurements |  |
Cash and cash equivalents, fair value | $ 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Commercial paper |  |
Fair value measurements |  |
Cash and cash equivalents, fair value |  | $ 0

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