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FINANCIAL INSTRUMENTS (Tables) | 6 Months Ended
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Jun. 30, 2023
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, 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 | $ | 306,006 |  |  | $ | — |  |  | $ | — |  |  | $ | 306,006 |  |  | $ | 306,006 |  |  | $ | — |  |  | $ | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market instruments | 382,127 |  |  | — |  |  | — |  |  | 382,127 |  |  | 382,127 |  |  | — |  |  | — |
Corporate debt securities | 420,171 |  |  | 34 |  |  | (7,194) |  |  | 413,011 |  |  | — |  |  | 223,194 |  |  | 189,817 |
U.S. government agency securities | 386,313 |  |  | 8 |  |  | (3,508) |  |  | 382,813 |  |  | 6,248 |  |  | 243,078 |  |  | 133,487 |
Commercial paper | 8,929 |  |  | 2 |  |  | (1) |  |  | 8,930 |  |  | — |  |  | 8,930 |  |  | — |
Asset-backed securities | 64,370 |  |  | 13 |  |  | (535) |  |  | 63,848 |  |  | — |  |  | 1,375 |  |  | 62,473 |
Subtotal | 1,261,910 |  |  | 57 |  |  | (11,238) |  |  | 1,250,729 |  |  | 388,375 |  |  | 476,577 |  |  | 385,777 |
Total | $ | 1,567,916 |  |  | $ | 57 |  |  | $ | (11,238) |  |  | $ | 1,556,735 |  |  | $ | 694,381 |  |  | $ | 476,577 |  |  | $ | 385,777 |
| December 31, 2022
| 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 | $ | 463,248 |  |  | $ | — |  |  | $ | — |  |  | $ | 463,248 |  |  | $ | 463,248 |  |  | $ | — |  |  | $ | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market instruments | 248,933 |  |  | — |  |  | — |  |  | 248,933 |  |  | 248,933 |  |  | — |  |  | — |
Corporate debt securities | 504,984 |  |  | 34 |  |  | (11,541) |  |  | 493,477 |  |  | 1,881 |  |  | 299,153 |  |  | 192,443 |
U.S. government agency securities | 312,720 |  |  | 45 |  |  | (3,771) |  |  | 308,994 |  |  | — |  |  | 229,846 |  |  | 79,148 |
Commercial paper | 48,103 |  |  | 11 |  |  | (22) |  |  | 48,092 |  |  | 10,469 |  |  | 37,623 |  |  | — |
Asset-backed securities | 63,151 |  |  | 69 |  |  | (592) |  |  | 62,628 |  |  | — |  |  | 384 |  |  | 62,244 |
Subtotal | 1,177,891 |  |  | 159 |  |  | (15,926) |  |  | 1,162,124 |  |  | 261,283 |  |  | 567,006 |  |  | 333,835 |
Total | $ | 1,641,139 |  |  | $ | 159 |  |  | $ | (15,926) |  |  | $ | 1,625,372 |  |  | $ | 724,531 |  |  | $ | 567,006 |  |  | $ | 333,835 |
(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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