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MARKETABLE SECURITIES - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Marketable Securities [Line Items] |  |
Amortized Cost | $ 270,003 | $ 293,341
Unrealized Gains | 16 | 88
Unrealized Losses | (369) | (160)
Fair Value | 269,650 | 293,269
Government debt |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 13,000 | 39,996
Unrealized Gains | 1 | 0
Unrealized Losses | 0 | (8)
Fair Value | 13,001 | 39,988
Corporate debt |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 257,003 | 253,345
Unrealized Gains | 15 | 88
Unrealized Losses | (369) | (152)
Fair Value | $ 256,649 | $ 253,281

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