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CAPITAL STOCK - Disclosure of range of exercise prices of outstanding share options (Details) | 12 Months Ended |  |
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Dec. 31, 2019 CAD ($) Share | Dec. 31, 2018 Share | Dec. 31, 2017 Share
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of share options outstanding in share-based payment arrangement | 6,714,700 | 6,775,000 | 5,247,500
Number of share options exercisable in share-based payment arrangement | 6,697,200 |  |
Granted June 8, 2015 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of share options outstanding in share-based payment arrangement | 915,000 |  |
Number of share options exercisable in share-based payment arrangement | 915,000 |  |
Exercise price of outstanding share options | $ | $ 0.66 |  |
Expiry Date | June 8, 2020 |  |
Granted October 18, 2016 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of share options outstanding in share-based payment arrangement | 1,147,700 |  |
Number of share options exercisable in share-based payment arrangement | 1,147,700 |  |
Exercise price of outstanding share options | $ | $ 1.30 |  |
Expiry Date | October 18, 2021 |  |
Granted August 28, 2017 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of share options outstanding in share-based payment arrangement | 1,315,000 |  |
Number of share options exercisable in share-based payment arrangement | 1,315,000 |  |
Exercise price of outstanding share options | $ | $ 1.20 |  |
Expiry Date | August 28, 2022 |  |
Granted July 20, 2018 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of share options outstanding in share-based payment arrangement | 1,537,000 |  |
Number of share options exercisable in share-based payment arrangement | 1,537,000 |  |
Exercise price of outstanding share options | $ | $ 1.30 |  |
Expiry Date | July 20, 2023 |  |
Granted September 20, 2018 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of share options outstanding in share-based payment arrangement | 75,000 |  |
Number of share options exercisable in share-based payment arrangement | 75,000 |  |
Exercise price of outstanding share options | $ | $ 1.42 |  |
Expiry Date | September 20, 2023 |  |
Granted November 28, 2018 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of share options outstanding in share-based payment arrangement | 15,000 |  |
Number of share options exercisable in share-based payment arrangement | 15,000 |  |
Exercise price of outstanding share options | $ | $ 1.57 |  |
Expiry Date | November 28, 2023 |  |
Granted December 14,2018 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of share options outstanding in share-based payment arrangement | 20,000 |  |
Number of share options exercisable in share-based payment arrangement | 20,000 |  |
Exercise price of outstanding share options | $ | $ 1.42 |  |
Expiry Date | December 14, 2023 |  |
Granted June 6, 2019 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of share options outstanding in share-based payment arrangement | 1,530,000 |  |
Number of share options exercisable in share-based payment arrangement | 1,512,500 |  |
Exercise price of outstanding share options | $ | $ 1.70 |  |
Expiry Date | June 6, 2024 |  |
Granted September 30, 2019 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of share options outstanding in share-based payment arrangement | 100,000 |  |
Number of share options exercisable in share-based payment arrangement | 100,000 |  |
Exercise price of outstanding share options | $ | $ 1.77 |  |
Expiry Date | September 30, 2024 |  |
Granted November 18, 2019 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of share options outstanding in share-based payment arrangement | 60,000 |  |
Number of share options exercisable in share-based payment arrangement | 60,000 |  |
Exercise price of outstanding share options | $ | $ 1.80 |  |
Expiry Date | November 18, 2024 |  |

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