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WARRANTS AND STOCK OPTIONS (Narrative) (Details)
 12 Months Ended
Dec. 31, 2020
Share
year
$ / shares
Dec. 31, 2019
$ / shares
Warrants And Stock Options [Abstract]    
Description of limits for stock options Based on the Company's stock option plan, most recently approved by the Company's shareholders at the annual general meeting held on May 30, 2018, Western may issue stock options for the purchase of up to 10% of issued capital.  
Description of vesting requirements for share-based payment arrangement Stock options vest over a two year period from the date of grant unless otherwise determined by the directors.  
Description of maximum term of options granted for share-based payment arrangement The maximum stock option term is 10 years.  
Maximum stock options authorized | Share 6,484,763  
Average fair value of share price | $ / shares $ 1.23 $ 0.87
Number of share options exercisable in share-based payment arrangement | Share 4,191,661  
Weighted average exercise price of share options exercisable in share-based payment arrangement | $ / shares $ 1.04  
Weighted average remaining contractual life of exercisable share options (years) | year 2.16