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FINANCIAL INSTRUMENTS (Tables) | 6 Months Ended
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Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract] |
Schedule of Cash, Cash Equivalents and Available-for-Sale Securities by Significant Investment Category | The following tables show the Company’s cash, cash equivalents and available-for-sale securities by significant investment category for each period presented:
| June 30, 2024
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Aggregate Fair Value |  | Cash and Cash Equivalents |  | Short-term Marketable Securities (1) |  | Long-term Marketable Securities (2)
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 285,666 |  |  | $ | — |  |  | $ | — |  |  | $ | 285,666 |  |  | $ | 285,666 |  |  | $ | — |  |  | $ | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market instruments | 676,505 |  |  | — |  |  | — |  |  | 676,505 |  |  | 676,505 |  |  | — |  |  | — |
Corporate debt securities | 537,626 |  |  | 670 |  |  | (1,460) |  |  | 536,836 |  |  | — |  |  | 162,959 |  |  | 373,877 |
U.S. government agency securities | 184,487 |  |  | 39 |  |  | (966) |  |  | 183,560 |  |  | 9,979 |  |  | 88,310 |  |  | 85,271 |
Asset-backed securities | 98,958 |  |  | 105 |  |  | (196) |  |  | 98,867 |  |  |  |  | 932 |  |  | 97,935 |
Subtotal | 1,497,576 |  |  | 814 |  |  | (2,622) |  |  | 1,495,768 |  |  | 686,484 |  |  | 252,201 |  |  | 557,083 |
Total | $ | 1,783,242 |  |  | $ | 814 |  |  | $ | (2,622) |  |  | $ | 1,781,434 |  |  | $ | 972,150 |  |  | $ | 252,201 |  |  | $ | 557,083 |
| December 31, 2023
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Aggregate Fair Value |  | Cash and Cash Equivalents |  | Short-term Marketable Securities (1) |  | Long-term Marketable Securities (2)
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 229,676 |  |  | $ | — |  |  | $ | — |  |  | $ | 229,676 |  |  | $ | 229,676 |  |  | $ | — |  |  | $ | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market instruments | 499,483 |  |  | — |  |  | — |  |  | 499,483 |  |  | 499,483 |  |  | — |  |  | — |
Corporate debt securities | 587,896 |  |  | 3,476 |  |  | (1,996) |  |  | 589,376 |  |  | — |  |  | 193,251 |  |  | 396,125 |
U.S. government agency securities | 251,952 |  |  | 556 |  |  | (1,140) |  |  | 251,368 |  |  | 19,976 |  |  | 111,343 |  |  | 120,049 |
Commercial paper | 20,076 |  |  | 5 |  |  | — |  |  | 20,081 |  |  | 5,992 |  |  | 14,089 |  |  | — |
Asset-backed securities | 94,744 |  |  | 351 |  |  | (134) |  |  | 94,961 |  |  | — |  |  | — |  |  | 94,961 |
Subtotal | 1,454,151 |  |  | 4,388 |  |  | (3,270) |  |  | 1,455,269 |  |  | 525,451 |  |  | 318,683 |  |  | 611,135 |
Total | $ | 1,683,827 |  |  | $ | 4,388 |  |  | $ | (3,270) |  |  | $ | 1,684,945 |  |  | $ | 755,127 |  |  | $ | 318,683 |  |  | $ | 611,135 |
(1) The Company’s short-term marketable securities mature in one year or less. (2) The Company’s long-term marketable securities mature between one and five years.

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