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Share-Based Compensation And Other Related Information - Additional Information (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
shares
$ / shares
Dec. 31, 2017
USD ($)
shares
Disclosure of share-based payment arrangements [Abstract]    
Share-based compensation | $ $ 2,957 $ 3,077
Disclosure of non-adjusting events after reporting period [line items]    
Number of share options granted in share-based payment arrangement 149,163 91,945
Number of shares issued in lieu of directors fees (shares) 10,338 12,291
Directors' remuneration expense | $ $ 200 $ 200
Number of shares authorised (shares) 200,000,000  
Par value per common share | $ / shares $ 0  
Restricted Shares [Member]    
Disclosure of non-adjusting events after reporting period [line items]    
Granted (shares) 129,619 123,113
Vesting period 3 years 2 years
Stock Option [Member]    
Disclosure of non-adjusting events after reporting period [line items]    
Vesting period 2 years