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INVESTMENTS (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Available-for-sale |  |
Amortized Cost | $ 1,850,101 | $ 925,559
Gross Unrealized Holding Gains | 2 | 165
Gross Unrealized Holding Losses | 957 | 79
Fair Value | 1,849,146 | 925,645
Continuous Unrealized Loss Position less than 12 Months | 957 | 79
Short-term | Commercial paper |  |
Available-for-sale |  |
Amortized Cost | 334,077 | 119,886
Fair Value | 334,077 | 119,886
Short-term | Certificates of deposit |  |
Available-for-sale |  |
Amortized Cost | 44,502 | 20,387
Fair Value | 44,502 | 20,387
Short-term | Municipal securities |  |
Available-for-sale |  |
Amortized Cost | 666 | 9,083
Fair Value | 666 | 9,083
Short-term | U.S. government agency securities |  |
Available-for-sale |  |
Amortized Cost | 62,687 | 81,521
Gross Unrealized Holding Gains |  | 13
Gross Unrealized Holding Losses | 26 | 3
Fair Value | 62,661 | 81,531
Continuous Unrealized Loss Position less than 12 Months | 26 | 3
Short-term | U.S. treasuries |  |
Available-for-sale |  |
Amortized Cost | 1,308,536 | 650,386
Gross Unrealized Holding Gains | 2 | 150
Gross Unrealized Holding Losses | 717 | 69
Fair Value | 1,307,821 | 650,467
Continuous Unrealized Loss Position less than 12 Months | 717 | 69
Long-term | U.S. government agency securities |  |
Available-for-sale |  |
Amortized Cost | 12,500 | 10,350
Gross Unrealized Holding Gains |  | 1
Gross Unrealized Holding Losses | 24 |
Fair Value | 12,476 | 10,351
Continuous Unrealized Loss Position less than 12 Months | 24 |
Long-term | U.S. treasuries |  |
Available-for-sale |  |
Amortized Cost | 87,133 | 33,946
Gross Unrealized Holding Gains |  | 1
Gross Unrealized Holding Losses | 190 | 7
Fair Value | 86,943 | 33,940
Continuous Unrealized Loss Position less than 12 Months | $ 190 | $ 7

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