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Share-Based Compensation And Other Related Information - Additional Information (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
shares
right
Dec. 31, 2019
USD ($)
shares
right
Feb. 22, 2019
shares
right
Disclosure of share-based payment arrangements [Abstract]      
Share-based compensation | $ $ 3,024 $ 4,448  
Granted (shares) 7,605    
Granted (shares)   22,788  
Number of common shares issued in connection with exercise of stock options 329,379    
Number of common share option exercised (shares) 329,711 244,299  
Granted pursuant to the Tahoe Acquisition (shares)   835,874  
Disclosure of non-adjusting events after reporting period [line items]      
Number of shares issued in lieu of directors fees (shares) 9,883 22,335  
Directors' remuneration expense | $ $ 200 $ 200  
Number of shares authorised (shares) 400,000,000    
Tahoe Resources, Inc [member]      
Disclosure of detailed information about business combination [line items]      
Number of shares issued (shares)     72,426,594
Fair value estimate of the CVRs [Member] | Tahoe Resources, Inc [member]      
Disclosure of detailed information about business combination [line items]      
Number of CVRs issued | right     313,887,490
Number of shares issued (shares) 15,600,034 15,600,208 15,600,208
Number of CVRs outstanding | right 313,883,990 313,887,490