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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Long-term investments (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |
Total investment | $ 5,856 | $ 7,753
Cost Method Investments |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |
Total investment | 3,499 | 3,499
Equity Method Investments |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |
Total investment | 2,357 | 2,554
AFS |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |
Total investment |  | 1,700
UTStarcom Hong Kong Holdings Ltd. | Cost Method Investments |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |
Total investment | 3,499 | 3,499
ACELAND | Equity Method Investments |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |
Total investment | $ 2,357 | 2,554
AioTV | AFS |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |
Total investment |  | $ 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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