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SHARE CAPITAL, WARRANTS AND OPTIONS - Stock options activity (Details)
 12 Months Ended
Dec. 31, 2017
CAD ($)
Option
Y
Dec. 31, 2016
CAD ($)
Option
Y
Dec. 31, 2015
CAD ($)
Option
Y
Stock options activity      
Outstanding at end of year | Option 20,720,500    
Stock Option Plan      
Stock options activity      
Outstanding at beginning of year | Option 12,823,000 9,872,500 12,548,000
Issued | Option 9,137,500 6,058,000 1,350,000
Cancelled / Expired | Option (1,240,000) (3,107,500) (2,876,500)
Exercised | Option     (1,149,000)
Outstanding at end of year | Option 20,720,500 12,823,000 9,872,500
Weighted Average Exercise Price, Outstanding at beginning of year | $ $ 0.30 $ 0.37 $ 0.31
Weighted Average Exercise Price, Issued | $ 0.12 0.21 0.25
Weighted Average Exercise Price, Cancelled / Expired | $ 0.24 0.34 0.11
Weighted Average Exercise Price, Exercised | $     0.10
Weighted Average Exercise Price, Outstanding at end of year | $ 0.23 0.30 0.37
Expense from share-based payment transactions on grant of options | $ $ 504,000 278,000 232,000
Expense from share-based payment transactions on vesting of options | $   $ 31,000 $ 26,000
Option, expected dividend yield 0.00% 0.00% 0.00%
Expected life of options | Y 5 5 5
Options granted to consultant      
Stock options activity      
Issued | Option     200,000
Percentage of options vesting     25.00%
Period of time when options vest     3 months
Minimum | Stock Option Plan      
Stock options activity      
Expected share price volatility 66.60% 111.00% 157.90%
Option, risk-free interest rate 1.17% 0.68% 0.64%
Maximum | Stock Option Plan      
Stock options activity      
Percentage of issued and outstanding common stock that can be acquired by directors, officers, employees and consultants 10.00%    
Term of options can be granted 10 years    
Term of options granted 5 years 5 years 5 years
Expected share price volatility 100.60% 113.00% 170.50%
Option, risk-free interest rate 1.80% 0.79% 0.79%