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FINANCIAL INSTRUMENTS (Tables) | 6 Months Ended
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Jun. 30, 2022
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, 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 | $ | 355,318 |  |  | $ | — |  |  | $ | — |  |  | $ | 355,318 |  |  | $ | 355,318 |  |  | $ | — |  |  | $ | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market instruments | 264,484 |  |  | — |  |  | — |  |  | 264,484 |  |  | 264,484 |  |  | — |  |  | — |
Corporate debt securities | 560,401 |  |  | 3 |  |  | (12,450) |  |  | 547,954 |  |  | — |  |  | 273,400 |  |  | 274,554 |
U.S. government agency securities | 263,184 |  |  | 15 |  |  | (2,734) |  |  | 260,465 |  |  | — |  |  | 180,952 |  |  | 79,513 |
Commercial paper | 33,107 |  |  | — |  |  | (23) |  |  | 33,084 |  |  | — |  |  | 33,084 |  |  | — |
Asset-backed securities | 58,888 |  |  | 8 |  |  | (633) |  |  | 58,263 |  |  | — |  |  | — |  |  | 58,263 |
Foreign and other | 2,562 |  |  | 124 |  |  | (4) |  |  | 2,682 |  |  | — |  |  | 2,509 |  |  | 173 |
Subtotal | 1,182,626 |  |  | 150 |  |  | (15,844) |  |  | 1,166,932 |  |  | 264,484 |  |  | 489,945 |  |  | 412,503 |
Total | $ | 1,537,944 |  |  | $ | 150 |  |  | $ | (15,844) |  |  | $ | 1,522,250 |  |  | $ | 619,802 |  |  | $ | 489,945 |  |  | $ | 412,503 |
| December 31, 2021
| 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 | $ | 301,177 |  |  | $ | — |  |  | $ | — |  |  | $ | 301,177 |  |  | $ | 301,177 |  |  | $ | — |  |  | $ | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market instruments | 285,099 |  |  | — |  |  | — |  |  | 285,099 |  |  | 285,099 |  |  | — |  |  | — |
Corporate debt securities | 584,000 |  |  | 386 |  |  | (2,086) |  |  | 582,300 |  |  | — |  |  | 200,304 |  |  | 381,996 |
U.S. government agency securities | 224,774 |  |  | 182 |  |  | (325) |  |  | 224,631 |  |  | — |  |  | 146,421 |  |  | 78,210 |
Commercial paper | 68,384 |  |  | — |  |  | — |  |  | 68,384 |  |  | 1,000 |  |  | 67,384 |  |  | — |
Asset-backed securities | 56,936 |  |  | 10 |  |  | (95) |  |  | 56,851 |  |  | — |  |  | 9,451 |  |  | 47,400 |
Foreign and other | 3,097 |  |  | 141 |  |  | (12) |  |  | 3,226 |  |  | — |  |  | 3,039 |  |  | 187 |
Subtotal | 1,222,290 |  |  | 719 |  |  | (2,518) |  |  | 1,220,491 |  |  | 286,099 |  |  | 426,599 |  |  | 507,793 |
Total | $ | 1,523,467 |  |  | $ | 719 |  |  | $ | (2,518) |  |  | $ | 1,521,668 |  |  | $ | 587,276 |  |  | $ | 426,599 |  |  | $ | 507,793 |
(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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