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FINANCIAL INSTRUMENTS - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Assets |  |
Cash and cash equivalents | $ 385,648 | $ 325,089
Short-term restricted cash | 300 | 300
Long-term restricted cash | 2,422 | 2,922
Total assets measured at fair value | 770,511 | 775,540
Liabilities |  |
Contingent consideration | 18,450 | 172,094
Total liabilities measured at fair value | 18,450 | 172,094
Investments: |  |
Assets |  |
Investments: | 382,141 | 447,229
Commercial paper |  |
Assets |  |
Investments: | 16,771 | 127,302
Corporate debt securities |  |
Assets |  |
Investments: | 75,853 | 49,491
U.S. government & agency securities |  |
Assets |  |
Investments: | 289,517 | 270,436
Level 1 |  |
Assets |  |
Cash and cash equivalents | 196,621 | 137,636
Short-term restricted cash | 300 | 300
Long-term restricted cash | 2,422 | 2,922
Total assets measured at fair value | 199,343 | 140,858
Liabilities |  |
Contingent consideration | 0 | 0
Total liabilities measured at fair value | 0 | 0
Level 1 | Investments: |  |
Assets |  |
Investments: | 0 | 0
Level 1 | Commercial paper |  |
Assets |  |
Investments: | 0 | 0
Level 1 | Corporate debt securities |  |
Assets |  |
Investments: | 0 | 0
Level 1 | U.S. government & agency securities |  |
Assets |  |
Investments: | 0 | 0
Level 2 |  |
Assets |  |
Cash and cash equivalents | 189,027 | 187,453
Short-term restricted cash | 0 | 0
Long-term restricted cash | 0 | 0
Total assets measured at fair value | 571,168 | 634,682
Liabilities |  |
Contingent consideration | 0 | 0
Total liabilities measured at fair value | 0 | 0
Level 2 | Investments: |  |
Assets |  |
Investments: | 382,141 | 447,229
Level 2 | Commercial paper |  |
Assets |  |
Investments: | 16,771 | 127,302
Level 2 | Corporate debt securities |  |
Assets |  |
Investments: | 75,853 | 49,491
Level 2 | U.S. government & agency securities |  |
Assets |  |
Investments: | 289,517 | 270,436
Level 3 |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Short-term restricted cash | 0 | 0
Long-term restricted cash | 0 | 0
Total assets measured at fair value | 0 | 0
Liabilities |  |
Contingent consideration | 18,450 | 172,094
Total liabilities measured at fair value | 18,450 | 172,094
Level 3 | Investments: |  |
Assets |  |
Investments: | 0 | 0
Level 3 | Commercial paper |  |
Assets |  |
Investments: | 0 | 0
Level 3 | Corporate debt securities |  |
Assets |  |
Investments: | 0 | 0
Level 3 | U.S. government & agency securities |  |
Assets |  |
Investments: | $ 0 | $ 0

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