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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Schedule of Financial Assets Measured and Recognized at Fair Value on a Recurring Basis and Classified under the Appropriate Level of the Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair value, assets and liabilities on a recurring and non-recurring basis |  |
Long-term investments | $ 5,856 | $ 7,753
Recurring |  |
Fair value, assets and liabilities on a recurring and non-recurring basis |  |
Short-term investments |  | 479
Long-term investments |  | 1,700
Level 3 | Recurring |  |
Fair value, assets and liabilities on a recurring and non-recurring basis |  |
Short-term investments |  | 479
Long-term investments |  | $ 1,700

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- Definition The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle). + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date. + 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 210.5-02.3(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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