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CASH, CASH EQUIVALENTS AND INVESTMENTS - Schedule of Short-Term Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | $ 361,364 | $ 304,380
Available-for-sale Securities, Gross Unrealized Gains | 151 | 6
Available-for-sale Securities, Gross Unrealized Losses |  | (63)
Available-for-sale Securities, Fair Value Disclosure | 361,515 | 304,323
Certificates of Deposit [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 800 | 500
Available-for-sale Securities, Gross Unrealized Losses |  | (1)
Available-for-sale Securities, Fair Value Disclosure | 800 | 499
Corporate Debt Securities [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 | 360,564 | 189,202
Available-for-sale Securities, Gross Unrealized Gains | 151 | 5
Available-for-sale Securities, Gross Unrealized Losses |  | (43)
Available-for-sale Securities, Fair Value Disclosure | $ 360,715 | $ 189,164

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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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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