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Business Combinations - Summary of Assets Acquired and Liabilities Assumed at the Date of Acquisition (Detail) - TLJ Intertech Inc. [member]
$ in Thousands
Dec. 31, 2018
TWD ($)
Disclosure of detailed information about business combination [Line Items]  
Current assets $ 16,645
Non-current assets 108,486
Current liabilities (7,599)
Fair value of identifiable net assets acquired $ 117,532