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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