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Other investments (Narrative) (Details) - CAD ($) |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
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Feb. 05, 2020 | Feb. 04, 2020 | Nov. 04, 2019 | May 07, 2019 | Sep. 06, 2018 | Nov. 22, 2019 | Sep. 20, 2019 | Apr. 24, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 31, 2018 | May 31, 2018
Disclosure Of Other Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss on change in fair value of derivative liability |  |  |  |  |  |  |  |  | $ 3,568,305 |  |  |
Proceeds from issuing shares |  |  |  |  |  |  |  |  | 4,593,777 | $ 44,987,422 |  |
Derivative liability |  |  |  |  |  |  |  |  | $ 2,646,269 |  |  |
Class B shares |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share issue price per share |  |  | $ 20.10 |  |  |  |  |  |  |  |  |
Proceeds from issuing shares |  |  | $ 4,593,777 |  |  |  |  |  |  |  |  |
Pharmadrug Inc. | Share Exchange Agreement |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares acquired |  |  |  |  |  |  |  | 13,562,386 |  |  |  |
Share price per share |  |  |  |  |  |  |  | $ 0.2212 |  |  |  |
Pharmadrug Inc. | Share Exchange Agreement | Class B shares |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued in share exchange |  |  |  |  |  |  | 61,892 | 65,577 |  |  |  |
Share issue price per share |  |  |  |  |  |  |  | $ 45.75 |  |  |  |
Value of shares issued in share exchange |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |
Loss on change in fair value of derivative liability |  |  |  |  |  |  | $ 1,422,036 |  |  |  |  |
Pharmadrug Inc. | Share Exchange Agreement | Class B shares |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued in share exchange |  |  |  |  |  |  | 61,892 | 65,577 |  |  |  |
Share issue price per share |  |  |  |  |  |  |  | $ 45.75 |  |  |  |
Value of shares issued in share exchange |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |
Loss on change in fair value of derivative liability |  |  |  |  |  |  |  | $ 1,422,036 |  |  |  |
Cannara Biotech Inc. | Class B shares |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares held subject to escrow arrangement |  |  |  |  |  |  |  |  | 85,003,750 |  |  |
Quoted market price of investments |  |  |  |  |  |  |  |  | $ 0.125 |  |  |
Percentage of aggregate discount for escrow |  |  |  |  |  |  |  |  | 19.53% |  |  |
Aggregate discount for shares in escrow |  |  |  |  |  |  |  |  | $ 1,556,431 |  |  |
Cannara Biotech Inc. | Class B shares | Subsequent events |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuing shares | $ 7,743,492 |  |  |  |  |  |  |  |  |  |  |
Cannara Biotech Inc. | Unrestricted Class B shares | Level 1 |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares held subject to escrow arrangement |  |  |  |  |  |  |  |  | 21,250,935 |  |  |
Cannara Biotech Inc. | Class B shares held in escrow | Level 2 |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares held subject to escrow arrangement |  |  |  |  |  |  |  |  | 63,752,815 |  |  |
Clover Cannastrip Thin Film Technologies Corp. |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Value of subscribed equity units in brokered private placement |  |  |  |  | $ 1,500,000 |  |  |  |  |  |  |
High Tide Inc. |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares held |  |  |  |  |  |  |  |  | 4,551,999 |  |  |
Number of warrants held |  |  |  |  |  |  |  |  | 2,000,000 |  |  |
Proceeds from sale of shares and warrants |  |  |  |  |  | $ 614,520 |  |  |  |  |  |
HUGE Shops |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares held |  |  |  |  |  |  |  |  | 17,333,333 |  |  |
Subscription price per share |  |  |  |  |  |  |  |  | $ 0.075 |  |  |
Percentage of decline in fair value of investment |  |  |  |  |  |  |  |  | 41.50% |  |  |
Change in fair value of investment |  |  |  |  |  |  |  |  | $ 54,000 |  |  |
SciCann Therapeutics Inc. |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares held |  |  |  |  |  |  |  |  | 117,648 |  |  |
Subscription price per share |  |  |  |  |  |  |  |  |  |  | $ 17 | $ 17
Percentage of decline in fair value of investment |  |  |  |  |  |  |  |  | 64.40% |  |  |
Change in fair value of investment |  |  |  |  |  |  |  |  | $ 129,000 |  |  |
Solarvest BioEnergy Inc. |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share price per share |  |  |  |  |  |  |  |  | $ 0.145 |  |  |
Loss on change in fair value of derivative liability |  |  |  |  |  |  |  |  | $ 2,146,269 |  |  |
Number of shares held |  |  |  | 3,000,000 |  |  |  |  |  |  |  |
Number of warrants held |  |  |  | 3,000,000 |  |  |  |  |  |  |  |
Principal amount of convertible debenture |  |  |  | $ 2,400,000 |  |  |  |  | $ 2,400,000 |  |  |
Fair value of shares and warrants acquired |  |  |  | 3,000,000 |  |  |  |  |  |  |  |
Exercise price of warrants |  |  |  |  |  |  |  |  | $ 0.25 |  |  |
Quoted market price of investments |  |  |  |  |  |  |  |  | $ 0.145 |  |  |
Risk free rate of warrants |  |  |  |  |  |  |  |  | 1.71% |  |  |
Expected volatility of warrants |  |  |  |  |  |  |  |  | 94.00% |  |  |
Expected term of warrants |  |  |  |  |  |  |  |  | 1 year 4 months 6 days |  |  |
Expected dividend yield |  |  |  |  |  |  |  |  | 0.00% |  |  |
Debt conversion ratio |  |  |  |  |  |  |  |  | 1 |  |  |
Solarvest BioEnergy Inc. | Subsequent events | Class B shares |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of additional shares issued to settle derivative liability |  | 225,371 |  |  |  |  |  |  |  |  |  |
Solarvest BioEnergy Inc. | Share Exchange Agreement |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative financial liabilities |  |  |  | 500,000 |  |  |  |  |  |  |  |
Guaranteed minimum liquidation value of shares |  |  |  | $ 3,000,000 |  |  |  |  | $ 3,000,000 |  |  |
Solarvest BioEnergy Inc. | Share Exchange Agreement | Class B shares |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued in share exchange |  |  |  | 49,751 |  |  |  |  |  |  |  |
Solarvest BioEnergy Inc. | Share Exchange Agreement | Class B shares |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued in share exchange |  |  |  | 49,751 |  |  |  |  |  |  |  |
Share issue price per share |  |  |  | $ 50.25 |  |  |  |  |  |  |  |
Value of shares issued in share exchange |  |  |  | $ 2,500,000 |  |  |  |  |  |  |  |

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