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CASH, CASH EQUIVALENTS AND INVESTMENTS - Schedule of Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Short-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	$ 351,299	$ 99,929
Available-for-sale Securities, Gross Unrealized Gains	3	67
Available-for-sale Securities, Gross Unrealized Losses	(108)	0
Available-for-sale Securities, Fair Value Disclosure	351,194	99,996
Short-term Investments [Member] | Certificates of Deposit [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	240
Available-for-sale Securities, Gross Unrealized Gains	0
Available-for-sale Securities, Gross Unrealized Losses	0
Available-for-sale Securities, Fair Value Disclosure	240
Short-term Investments [Member] | Corporate Bond Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	226,448
Available-for-sale Securities, Gross Unrealized Gains	3
Available-for-sale Securities, Gross Unrealized Losses	(97)
Available-for-sale Securities, Fair Value Disclosure	226,354
Short-term Investments [Member] | U.S. Government Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	124,611	99,929
Available-for-sale Securities, Gross Unrealized Gains	0	67
Available-for-sale Securities, Gross Unrealized Losses	(11)	0
Available-for-sale Securities, Fair Value Disclosure	124,600	$ 99,996
Long-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	159,692
Available-for-sale Securities, Gross Unrealized Gains	10
Available-for-sale Securities, Gross Unrealized Losses	(134)
Available-for-sale Securities, Fair Value Disclosure	159,568
Long-term Investments [Member] | U.S. Government Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	159,692
Available-for-sale Securities, Gross Unrealized Gains	10
Available-for-sale Securities, Gross Unrealized Losses	(134)
Available-for-sale Securities, Fair Value Disclosure	$ 159,568

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- Definition

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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