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FINANCIAL INSTRUMENTS (Tables) | 9 Months Ended
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Sep. 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:
| September 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 | $ | 294,209 |  |  | $ | — |  |  | $ | — |  |  | $ | 294,209 |  |  | $ | 294,209 |  |  | $ | — |  |  | $ | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market instruments | 291,735 |  |  | — |  |  | — |  |  | 291,735 |  |  | 291,735 |  |  | — |  |  | — |
Corporate debt securities | 560,004 |  |  | 1,230 |  |  | (198) |  |  | 561,036 |  |  | 703 |  |  | 177,468 |  |  | 382,865 |
U.S. government agency securities | 210,444 |  |  | 416 |  |  | (7) |  |  | 210,853 |  |  | 12,999 |  |  | 161,207 |  |  | 36,647 |
Commercial paper | 129,818 |  |  | 1 |  |  | (1) |  |  | 129,818 |  |  | 17,497 |  |  | 112,321 |  |  | — |
Asset-backed securities | 55,182 |  |  | 26 |  |  | (23) |  |  | 55,185 |  |  | — |  |  | 8,272 |  |  | 46,913 |
Foreign and other | 3,114 |  |  | 150 |  |  | (6) |  |  | 3,258 |  |  | — |  |  | 3,065 |  |  | 193 |
Subtotal | 1,250,297 |  |  | 1,823 |  |  | (235) |  |  | 1,251,885 |  |  | 322,934 |  |  | 462,333 |  |  | 466,618 |
Total | $ | 1,544,506 |  |  | $ | 1,823 |  |  | $ | (235) |  |  | $ | 1,546,094 |  |  | $ | 617,143 |  |  | $ | 462,333 |  |  | $ | 466,618 |
| 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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