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CASH, CASH EQUIVALENTS AND INVESTMENTS - Schedule of Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Cash and Cash Equivalents [Line Items] |  |
Investments, Amortized Cost Basis | $ 415,056 | $ 320,563
Investments, Gross Unrealized Gains | 5 | 1
Investments, Gross Unrealized Losses | (121) | (392)
Investments | 414,940 | 320,172
Certificates of Deposit [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash Equivalents, at Carrying Value | 400 | 1,296
Cash Equivalents, Gross Unrealized Gain |  | 1
Cash Equivalents, Gross Unrealized Losses |  | (1)
Cash and Cash Equivalents, Fair Value Disclosure | 400 | 1,296
Corporate Debt Securities [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash Equivalents, at Carrying Value |  | 17,900
Available-for-sale Debt Securities, Amortized Cost Basis | 188,832 | 104,626
Available-for-sale Securities, Gross Unrealized Gains | 4 |
Available-for-sale Securities, Gross Unrealized Losses | (45) | (252)
Available-for-sale Securities, Fair Value Disclosure | 188,791 | 104,374
U.S. Government Securities [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash Equivalents, at Carrying Value | 23,000 |
Available-for-sale Debt Securities, Amortized Cost Basis | 225,824 | 214,641
Available-for-sale Securities, Gross Unrealized Gains | 1 |
Available-for-sale Securities, Gross Unrealized Losses | (76) | (139)
Available-for-sale Securities, Fair Value Disclosure | $ 225,749 | $ 214,502

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