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CASH, CASH EQUIVALENTS AND INVESTMENTS - Schedule of Short-Term Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	$ 509,412	$ 514,277
Available-for-sale Securities, Gross Unrealized Gains	636	190
Available-for-sale Securities, Gross Unrealized Losses		(6)
Available-for-sale Securities, Fair Value Disclosure	510,048	514,461
Certificates of Deposit [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	150	700
Available-for-sale Securities, Fair Value Disclosure	150	700
U.S. Government Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	509,262	513,577
Available-for-sale Securities, Gross Unrealized Gains	636	190
Available-for-sale Securities, Gross Unrealized Losses		(6)
Available-for-sale Securities, Fair Value Disclosure	$ 509,898	$ 513,761

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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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