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CASH, CASH EQUIVALENTS AND INVESTMENTS - Schedule of Short-Term Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	$ 514,277	$ 304,380
Available-for-sale Securities, Gross Unrealized Gains	190	6
Available-for-sale Securities, Gross Unrealized Losses	(6)	(63)
Available-for-sale Securities, Fair Value Disclosure	514,461	304,323
Certificates of Deposit [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	700	500
Available-for-sale Securities, Gross Unrealized Losses		(1)
Available-for-sale Securities, Fair Value Disclosure	700	499
Corporate Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		114,678
Available-for-sale Securities, Gross Unrealized Gains		1
Available-for-sale Securities, Gross Unrealized Losses		(19)
Available-for-sale Securities, Fair Value Disclosure		114,660
U.S. Government Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	513,577	189,202
Available-for-sale Securities, Gross Unrealized Gains	190	5
Available-for-sale Securities, Gross Unrealized Losses	(6)	(43)
Available-for-sale Securities, Fair Value Disclosure	$ 513,761	$ 189,164

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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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