MARKETABLE SECURITIES - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Marketable Securities [Line Items]
Amortized Cost	$ 271,649	$ 293,341
Unrealized Gains	20	88
Unrealized Losses	(210)	(160)
Fair Value	271,459	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	269,649	253,345
Unrealized Gains	20	88
Unrealized Losses	(210)	(152)
Fair Value	$ 269,459	$ 253,281

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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Amount, before tax, of unrealized loss 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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Amortized cost of 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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Amount of 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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