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MARKETABLE SECURITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 293,341
Unrealized Gains	88
Unrealized Losses	(160)
Fair Value	293,269	$ 0
Government debt
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	39,996
Unrealized Gains	0
Unrealized Losses	(8)
Fair Value	39,988
Corporate debt
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	253,345
Unrealized Gains	88
Unrealized Losses	(152)
Fair Value	$ 253,281

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