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Trade Receivables, Net - Transfer of Financial Asset (Detail) - 12 months ended Dec. 31, 2019 - First Commercial Bank Member [Member]
$ in Thousands, $ in Thousands
TWD ($)
USD ($)
USD ($)
Receivables Factoring Proceeds [Member]      
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]      
Assets that entity continues to recognise $ 7,567   $ 253
Advances Received Used [Member]      
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]      
Advances received $ 7,567 $ 253  
Interest Rate On Advances Received Against Trade Receivables Sold [Member]      
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]      
Interest rates on advances received 2.20% 2.20%