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FINANCIAL INSTRUMENTS - Schedule of Available For Sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value Measurements |  |
Cost | $ 559,723 | $ 516,845
Gross Unrealized Gains | 109 | 350
Gross Unrealized Losses | (10) | (31)
Fair Value (Level 2) | 559,822 | 517,164
Short-term: |  |
Fair Value Measurements |  |
Cost |  | 421,416
Gross Unrealized Gains |  | 320
Gross Unrealized Losses |  | (31)
Fair Value (Level 2) |  | 421,705
Long-term: |  |
Fair Value Measurements |  |
Cost |  | 95,429
Gross Unrealized Gains |  | 30
Gross Unrealized Losses |  | 0
Fair Value (Level 2) |  | 95,459
Asset-backed securities | Short-term: |  |
Fair Value Measurements |  |
Cost | 17,615 | 34,918
Gross Unrealized Gains | 3 | 98
Gross Unrealized Losses | (2) | 0
Fair Value (Level 2) | 17,616 | 35,016
Commercial paper | Short-term: |  |
Fair Value Measurements |  |
Cost | 423,302 | 221,494
Gross Unrealized Gains | 82 | 36
Gross Unrealized Losses | 0 | (18)
Fair Value (Level 2) | 423,384 | 221,512
Corporate bonds | Short-term: |  |
Fair Value Measurements |  |
Cost | 32,612 | 120,375
Gross Unrealized Gains | 0 | 179
Gross Unrealized Losses | (7) | (11)
Fair Value (Level 2) | 32,605 | 120,543
U.S. Government bonds | Short-term: |  |
Fair Value Measurements |  |
Cost | 86,194 | 44,629
Gross Unrealized Gains | 24 | 7
Gross Unrealized Losses | (1) | (2)
Fair Value (Level 2) | $ 86,217 | 44,634
U.S. Government bonds | Long-term: |  |
Fair Value Measurements |  |
Cost |  | 95,429
Gross Unrealized Gains |  | 30
Gross Unrealized Losses |  | 0
Fair Value (Level 2) |  | $ 95,459

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