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Other Long-Term Liabilities (Tables)
3 Months Ended
Mar. 31, 2018
Other Liabilities Disclosure [Abstract]  
Other long-term liabilities
   

March 31,

2018

   

December 31,

2017

 
Subsidies to Stress Free Polishing project, commenced in 2008 and 2017   $ 1,977     $ 1,952  
Subsidies to Electro Copper Plating project, commenced in 2014     4,204       4,265  
Total    $ 6,181     $ 6,217