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FINANCIAL INSTRUMENTS (Tables) | 9 Months Ended
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Sep. 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:
| September 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 | $ | 381,781 |  |  | $ | — |  |  | $ | — |  |  | $ | 381,781 |  |  | $ | 381,781 |  |  | $ | — |  |  | $ | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market instruments | 288,687 |  |  | — |  |  | — |  |  | 288,687 |  |  | 288,687 |  |  | — |  |  | — |
Corporate debt securities | 551,545 |  |  | 6,154 |  |  | (114) |  |  | 557,585 |  |  | — |  |  | 178,968 |  |  | 378,617 |
U.S. government agency securities | 172,606 |  |  | 1,372 |  |  | (49) |  |  | 173,929 |  |  | 4,980 |  |  | 75,134 |  |  | 93,815 |
Asset-backed securities | 89,866 |  |  | 588 |  |  | (7) |  |  | 90,447 |  |  | — |  |  | 894 |  |  | 89,553 |
Subtotal | 1,102,704 |  |  | 8,114 |  |  | (170) |  |  | 1,110,648 |  |  | 293,667 |  |  | 254,996 |  |  | 561,985 |
Total | $ | 1,484,485 |  |  | $ | 8,114 |  |  | $ | (170) |  |  | $ | 1,492,429 |  |  | $ | 675,448 |  |  | $ | 254,996 |  |  | $ | 561,985 |
| 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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