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OTHER LONG-TERM LIABILITIES (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Other Long-term Liabilities [Abstract]    
Other long-term liabilities $ 2,980 $ 4,583
Subsidies to Stress Free Polishing Project, Commenced in 2008 and 2017 [Member]    
Other Long-term Liabilities [Abstract]    
Other long-term liabilities 1,281 1,483
Subsidies to Electro Copper Plating Project, Commenced in 2014    
Other Long-term Liabilities [Abstract]    
Other long-term liabilities 1,456 2,860
Subsidies to Polytetrafluoroethylene, Commenced in 2018 [Member]    
Other Long-term Liabilities [Abstract]    
Other long-term liabilities 143 178
Other [Member]    
Other Long-term Liabilities [Abstract]    
Other long-term liabilities $ 100 $ 62