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MARKETABLE SECURITIES - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Marketable Securities [Line Items]
Amortized Cost	$ 235,556	$ 293,341
Unrealized Gains	25	88
Unrealized Losses	(144)	(160)
Fair Value	235,437	293,269
Government debt
Marketable Securities [Line Items]
Amortized Cost	2,000	39,996
Unrealized Gains	0	0
Unrealized Losses	0	(8)
Fair Value	2,000	39,988
Corporate debt
Marketable Securities [Line Items]
Amortized Cost	233,556	253,345
Unrealized Gains	25	88
Unrealized Losses	(144)	(152)
Fair Value	$ 233,437	$ 253,281

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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