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CASH, CASH EQUIVALENTS AND INVESTMENTS - Schedule of Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Cash and Cash Equivalents [Line Items] |  |
Investments, Amortized Cost Basis | $ 275,115 | $ 248,951
Investments, Gross Unrealized Gains | 19 | 10
Investments, Gross Unrealized Losses | (250) | (382)
Investments | 274,884 | 248,579
Certificates of Deposit [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash Equivalents, at Carrying Value | 1,770 | 3,362
Cash Equivalents, Gross Unrealized Gain | 1 | 3
Cash Equivalents, Gross Unrealized Losses | (1) |
Cash and Cash Equivalents, Fair Value Disclosure | 1,770 | 3,365
Commercial Paper [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash Equivalents, at Carrying Value | 3,994 | 2,998
Cash Equivalents, Gross Unrealized Losses | (1) | (2)
Cash and Cash Equivalents, Fair Value Disclosure | 3,993 | 2,996
Corporate Debt Securities [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 195,542 | 209,595
Available-for-sale Securities, Gross Unrealized Gains | 14 | 6
Available-for-sale Securities, Gross Unrealized Losses | (242) | (377)
Available-for-sale Securities, Fair Value Disclosure | 195,314 | 209,224
US Treasury and Government [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 73,809 | 32,996
Available-for-sale Securities, Gross Unrealized Gains | 4 | 1
Available-for-sale Securities, Gross Unrealized Losses | (6) | (3)
Available-for-sale Securities, Fair Value Disclosure | $ 73,807 | $ 32,994

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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