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SHARE-BASED PAYMENTS - Share option plan black-scholes option pricing model (Details) - Share options - CAD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Weighted average assumptions used in computing the fair value of stock options granted    
Weighted average share price (CDN$) $ 4.59 $ 4.95
Expected dividend yield 0.00% 0.00%
Expected volatility 44.80% 47.50%
Risk-free interest rate 1.80% 2.10%
Expected option life (in years) 4 years 6 months 4 years 6 months
Weighted average fair value per stock option granted (CDN$) $ 1.79 $ 2.05