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FAIR VALUE MEASUREMENTS - Schedule of Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair value measurements |  |
Cash, cash equivalents, and restricted cash | $ 274,076 | $ 1,491,594
Estimated Fair Value | 941,620 | 937,172
Equity securities | 3,068 | 1,521
Restricted cash |  |
Fair value measurements |  |
Cash, cash equivalents, and restricted cash | 297 | 306
Fair Value, Recurring |  |
Fair value measurements |  |
Equity securities | 3,068 | 1,521
Non-marketable securities | 2,540 |
Contingent consideration | (363,647) | (2,477)
Total | 857,657 | 1,837,816
Fair Value, Recurring | Corporate bonds |  |
Fair value measurements |  |
Estimated Fair Value | 368,832 | 132,913
Fair Value, Recurring | Certificates of deposit |  |
Fair value measurements |  |
Estimated Fair Value | 175,542 |
Fair Value, Recurring | Commercial paper |  |
Fair value measurements |  |
Estimated Fair Value | 10,001 |
Fair Value, Recurring | U.S. government agency securities |  |
Fair value measurements |  |
Estimated Fair Value | 276,081 | 207,171
Fair Value, Recurring | Asset backed securities |  |
Fair value measurements |  |
Estimated Fair Value | 111,164 | 7,094
Fair Value, Recurring | Cash and money market |  |
Fair value measurements |  |
Cash, cash equivalents, and restricted cash | 273,779 | 901,294
Fair Value, Recurring | Restricted cash |  |
Fair value measurements |  |
Cash, cash equivalents, and restricted cash | 297 | 306
Fair Value, Recurring | U.S. government agency securities |  |
Fair value measurements |  |
Cash, cash equivalents, and restricted cash |  | 589,994
Level 1 | Fair Value, Recurring |  |
Fair value measurements |  |
Equity securities | 0 | 1,521
Non-marketable securities | 0 |
Contingent consideration | 0 | 0
Total | 274,076 | 903,121
Level 1 | Fair Value, Recurring | Corporate bonds |  |
Fair value measurements |  |
Estimated Fair Value | 0 | 0
Level 1 | Fair Value, Recurring | Certificates of deposit |  |
Fair value measurements |  |
Estimated Fair Value | 0 |
Level 1 | Fair Value, Recurring | Commercial paper |  |
Fair value measurements |  |
Estimated Fair Value | 0 |
Level 1 | Fair Value, Recurring | U.S. government agency securities |  |
Fair value measurements |  |
Estimated Fair Value | 0 | 0
Level 1 | Fair Value, Recurring | Asset backed securities |  |
Fair value measurements |  |
Estimated Fair Value | 0 | 0
Level 1 | Fair Value, Recurring | Cash and money market |  |
Fair value measurements |  |
Cash, cash equivalents, and restricted cash | 273,779 | 901,294
Level 1 | Fair Value, Recurring | Restricted cash |  |
Fair value measurements |  |
Cash, cash equivalents, and restricted cash | 297 | 306
Level 1 | Fair Value, Recurring | U.S. government agency securities |  |
Fair value measurements |  |
Cash, cash equivalents, and restricted cash |  | 0
Level 2 | Fair Value, Recurring |  |
Fair value measurements |  |
Equity securities | 3,068 | 0
Non-marketable securities | 0 |
Contingent consideration | 0 | 0
Total | 944,688 | 937,172
Level 2 | Fair Value, Recurring | Corporate bonds |  |
Fair value measurements |  |
Estimated Fair Value | 368,832 | 132,913
Level 2 | Fair Value, Recurring | Certificates of deposit |  |
Fair value measurements |  |
Estimated Fair Value | 175,542 |
Level 2 | Fair Value, Recurring | Commercial paper |  |
Fair value measurements |  |
Estimated Fair Value | 10,001 |
Level 2 | Fair Value, Recurring | U.S. government agency securities |  |
Fair value measurements |  |
Estimated Fair Value | 276,081 | 207,171
Level 2 | Fair Value, Recurring | Asset backed securities |  |
Fair value measurements |  |
Estimated Fair Value | 111,164 | 7,094
Level 2 | Fair Value, Recurring | Cash and money market |  |
Fair value measurements |  |
Cash, cash equivalents, and restricted cash | 0 | 0
Level 2 | Fair Value, Recurring | Restricted cash |  |
Fair value measurements |  |
Cash, cash equivalents, and restricted cash | 0 | 0
Level 2 | Fair Value, Recurring | U.S. government agency securities |  |
Fair value measurements |  |
Cash, cash equivalents, and restricted cash |  | 589,994
Level 3 | Fair Value, Recurring |  |
Fair value measurements |  |
Equity securities | 0 | 0
Non-marketable securities | 2,540 |
Contingent consideration | (363,647) | (2,477)
Total | (361,107) | (2,477)
Level 3 | Fair Value, Recurring | Corporate bonds |  |
Fair value measurements |  |
Estimated Fair Value | 0 | 0
Level 3 | Fair Value, Recurring | Certificates of deposit |  |
Fair value measurements |  |
Estimated Fair Value | 0 |
Level 3 | Fair Value, Recurring | Commercial paper |  |
Fair value measurements |  |
Estimated Fair Value | 0 |
Level 3 | Fair Value, Recurring | U.S. government agency securities |  |
Fair value measurements |  |
Estimated Fair Value | 0 | 0
Level 3 | Fair Value, Recurring | Asset backed securities |  |
Fair value measurements |  |
Estimated Fair Value | 0 | 0
Level 3 | Fair Value, Recurring | Cash and money market |  |
Fair value measurements |  |
Cash, cash equivalents, and restricted cash | 0 | 0
Level 3 | Fair Value, Recurring | Restricted cash |  |
Fair value measurements |  |
Cash, cash equivalents, and restricted cash | $ 0 | 0
Level 3 | Fair Value, Recurring | U.S. government agency securities |  |
Fair value measurements |  |
Cash, cash equivalents, and restricted cash |  | $ 0

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