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FINANCIAL INSTRUMENTS (Tables) | 6 Months Ended
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Jun. 30, 2021
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, 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 | $ | 348,830 |  |  | $ | — |  |  | $ | — |  |  | $ | 348,830 |  |  | $ | 348,830 |  |  | $ | — |  |  | $ | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market instruments | 249,556 |  |  | — |  |  | — |  |  | 249,556 |  |  | 249,556 |  |  | — |  |  | — |
Corporate debt securities | 426,514 |  |  | 1,639 |  |  | (110) |  |  | 428,043 |  |  | — |  |  | 168,393 |  |  | 259,650 |
U.S. government agency securities | 253,923 |  |  | 685 |  |  | (30) |  |  | 254,578 |  |  | 27,999 |  |  | 166,491 |  |  | 60,088 |
Commercial paper | 153,334 |  |  | 3 |  |  | — |  |  | 153,337 |  |  | 15,148 |  |  | 138,189 |  |  | — |
Asset-backed securities | 38,553 |  |  | 42 |  |  | (12) |  |  | 38,583 |  |  | — |  |  | 8,282 |  |  | 30,301 |
Foreign and other | 550 |  |  | 157 |  |  | — |  |  | 707 |  |  | — |  |  | 509 |  |  | 198 |
Subtotal | 1,122,430 |  |  | 2,526 |  |  | (152) |  |  | 1,124,804 |  |  | 292,703 |  |  | 481,864 |  |  | 350,237 |
Total | $ | 1,471,260 |  |  | $ | 2,526 |  |  | $ | (152) |  |  | $ | 1,473,634 |  |  | $ | 641,533 |  |  | $ | 481,864 |  |  | $ | 350,237 |
| December 31, 2020
| 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 | $ | 370,325 |  |  | $ | — |  |  | $ | — |  |  | $ | 370,325 |  |  | $ | 370,325 |  |  | $ | — |  |  | $ | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market instruments | 264,833 |  |  | — |  |  | — |  |  | 264,833 |  |  | 264,833 |  |  | — |  |  | — |
Corporate debt securities | 413,137 |  |  | 3,261 |  |  | (8) |  |  | 416,390 |  |  | — |  |  | 220,551 |  |  | 195,839 |
U.S. government agency securities | 265,298 |  |  | 1,555 |  |  | (1) |  |  | 266,852 |  |  | 14,000 |  |  | 192,488 |  |  | 60,364 |
Asset-backed securities | 31,659 |  |  | 85 |  |  | (2) |  |  | 31,742 |  |  | — |  |  | 3,189 |  |  | 28,553 |
Foreign and other | 549 |  |  | 168 |  |  | — |  |  | 717 |  |  | — |  |  | — |  |  | 717 |
Subtotal | 975,476 |  |  | 5,069 |  |  | (11) |  |  | 980,534 |  |  | 278,833 |  |  | 416,228 |  |  | 285,473 |
Total | $ | 1,345,801 |  |  | $ | 5,069 |  |  | $ | (11) |  |  | $ | 1,350,859 |  |  | $ | 649,158 |  |  | $ | 416,228 |  |  | $ | 285,473 |
(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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