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OTHER INCOME, NET (Schedule of Components of Other Income, Net) (Parenthetical) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 14, 2014
OTHER INCOME (EXPENSES), NET |  |  |  |  |  |  |  |  |
Tax reserves released, statute of limitations |  |  |  |  |  | $ 1,232,000 | $ 1,409,000 | $ 2,557,000 |
Disposal gain from closure of subsidiary | $ 900,000 |  |  |  |  | $ 909,000 |  |  |
Inphi Corporation |  |  |  |  |  |  |  |  |
OTHER INCOME (EXPENSES), NET |  |  |  |  |  |  |  |  |
Shares received in exchange of interest in related party |  |  |  |  |  |  |  |  | 124,395,000
Equity Securities Sold During Period Shares |  |  |  |  | 124,395,000 |  |  |  |
Proceeds from sale of equity |  |  |  |  | $ 2,400,000 |  |  |  |
Realized gain on other income |  |  |  |  | $ 600,000 |  |  |  |
Cash proceeds from sale of assets |  |  |  | $ 700,000 |  |  |  |  |
Net carrying value of assets sold |  |  |  | $ 0 |  |  |  |  |
Escrow deposit |  |  | $ 300,000 |  |  |  |  |  |
Cortina |  |  |  |  |  |  |  |  |
OTHER INCOME (EXPENSES), NET |  |  |  |  |  |  |  |  |
Investment Ownership Percentage Disposed Of |  |  |  |  |  |  |  |  | 1.00%
Other income (expense), net | Inphi Corporation |  |  |  |  |  |  |  |  |
OTHER INCOME (EXPENSES), NET |  |  |  |  |  |  |  |  |
Escrow deposit |  | $ 100,000 |  |  |  |  |  |  |
Korean Subsidiary |  |  |  |  |  |  |  |  |
OTHER INCOME (EXPENSES), NET |  |  |  |  |  |  |  |  |
Tax reserves released, statute of limitations |  |  |  |  |  |  |  | $ 800,000 |

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