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Share-based payments (Tables)
 12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Issuance of Restricted Shares
 
  a)
On July 14, 2015, the Company’s Board of Directors approved the issuance of restricted shares. The record dates for the shares issuance were July 21, 2015 and May 10, 2016. The relevant information is as follows:
 
Type of
arrangement
    Grant
date		    Share price
on grant date
(in NT$)		      Number of
shares
(in thousands)		      Contract
period		   
Vesting condition
Restricted shares award agreement    July 21,
2015		      36.1        15,752      3 years    Meet service and performance conditions
Restricted shares award agreement    May 10,
2016		      30.6        1,548      3 years    Meet service and performance conditions