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Government Grants (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
TWD ($)
Contract One [Member]    
Government Grants [Line Items]    
Government Grants $ 2,416 $ 72,000
Execution Period January 2013 to June 2014 January 2013 to June 2014
Product Description MEMS Development Program MEMS Development Program
Contract Two [Member]    
Government Grants [Line Items]    
Government Grants $ 923 $ 27,500
Execution Period April 2013 to December 2014 April 2013 to December 2014
Product Description Wafer-Level Lens Development Program Wafer-Level Lens Development Program
Contract Three [Member]    
Government Grants [Line Items]    
Government Grants $ 4,265 $ 135,000
Execution Period August 2014 to July 2017 August 2014 to July 2017
Product Description LCOS Display Module Development Program LCOS Display Module Development Program
Contract Four [Member]    
Government Grants [Line Items]    
Government Grants $ 336 $ 10,000
Execution Period January 2017 to December 2018 January 2017 to December 2018
Product Description Electronic control of large aperture liquid crystal lens technology in the wisdom glasses platform Electronic control of large aperture liquid crystal lens technology in the wisdom glasses platform