XML 62 R208.htm IDEA: XBRL DOCUMENT v3.20.1
Share-based Payments Arrangement - CHTSC's Employee Stock Options Outstanding (Detail) - CHT Security Co., Ltd. (CHTSC) [Member]
12 Months Ended
Dec. 31, 2019
$ / shares
Dec. 20, 2019
$ / shares
Disclosure of range of exercise prices of outstanding share options [Line Items]    
Range of Exercise Price $ 19.085  
Number of Options Outstanding 4,500  
Weighted-average Remaining Contractual Life (Years) 4 years 11 months 19 days  
Weighted-average Exercise Price $ 19.085  
Options Exercisable Number of Options 0  
Option Exercisable Weighted-average Exercise Price | (per share) $ 0 $ 19.085