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Share Capital and Reserves - Additional Information (Detail) |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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Dec. 11, 2018 CAD ($) shares | Dec. 06, 2018 CAD ($) shares | Jun. 12, 2018 CAD ($) shares | Jun. 11, 2018 CAD ($) shares | Dec. 12, 2017 CAD ($) shares | Dec. 11, 2017 CAD ($) shares | Sep. 18, 2017 CAD ($) shares | Jul. 21, 2017 CAD ($) shares | Jul. 21, 2017 USD ($) shares | Jun. 12, 2017 CAD ($) shares | May 31, 2017 CAD ($) shares | Dec. 31, 2018 CAD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 CAD ($) shares | Dec. 31, 2017 USD ($) shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares issued | shares |  |  |  |  |  |  |  |  |  | 327,863 | 5,714,286 | 10,458,334 | 10,458,334 | 1,424,445 | 1,424,445
Exercise of options |  |  |  |  |  |  |  |  |  |  |  | $ 5,074,334 |  | $ 1,128,032 |
Exercise of options |  |  |  |  |  |  |  |  |  |  |  | (5,074,334) |  | (1,128,032) |
Common shares issued | shares | 693,994 | 693,994 | 745,378 | 745,378 | 555,670 | 555,670 |  |  |  | 327,863 |  |  |  |  |
Issue of shares on convertible debenture interest payment | $ 1,894,603 | $ 1,894,603 | $ 2,154,142 | $ 2,154,142 | $ 1,955,959 | $ 1,955,958 |  |  |  | $ 963,917 |  | $ 4,048,745 |  | 2,919,876 |
Exercise price |  |  |  |  |  |  |  |  |  |  | $ 0.50 |  | $ 0.49 |  | $ 0.79
Exercise of warrants, shares | shares |  |  |  |  |  |  |  |  |  |  | 5,714,286 |  |  |  |
Proceeds from exercise of warrants |  |  |  |  |  |  |  |  |  |  | $ 2,857,143 |  |  |  |
Issue of shares for cash from private placement, shares | shares |  |  |  |  |  |  |  | 24,146,424 | 24,146,424 |  |  |  |  |  |
Issue of shares for cash from private placement, share price |  |  |  |  |  |  |  |  | $ 2.0707 |  |  |  |  |  |
Proceeds from exercise of options |  |  |  |  |  |  |  | $ 62,745,000 | $ 50,000,000 |  |  |  |  | 60,225,368 |
Issue of shares on convertible debenture financing, shares | shares |  |  |  |  |  |  |  | 869,271 | 869,271 |  |  |  |  |  |
Issue of shares on convertible debenture financing |  |  |  |  |  |  |  | $ 2,258,820 |  |  |  |  |  | 2,258,820 |
Establishment fee, percent |  |  |  |  |  |  |  | 3.00% | 3.00% |  |  |  |  |  |
Share issue related cos |  |  |  |  |  |  |  | $ 2,513,028 |  |  |  |  |  | 2,519,632 |
Issue of shares for exploration and evaluation assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 333,330 |
Description of maximum term of options granted for share-based payment arrangement |  |  |  |  |  |  |  |  |  |  |  | Pursuant to the Company's stock option plan, directors may, from time to time, authorize the issuance of options to directors, officers, employees and consultants of the Company, enabling them to acquire up to 20% of the issued and outstanding common shares of the Company. The options can be granted for a maximum term of 10 years and are subject to vesting provisions as determined by the Board of Directors of the Company. | Pursuant to the Company's stock option plan, directors may, from time to time, authorize the issuance of options to directors, officers, employees and consultants of the Company, enabling them to acquire up to 20% of the issued and outstanding common shares of the Company. The options can be granted for a maximum term of 10 years and are subject to vesting provisions as determined by the Board of Directors of the Company. |  |
Percentage of issued and outstanding shares acquired |  |  |  |  |  |  |  |  |  |  |  | 20.00% | 20.00% |  |
Options granted, maximum term |  |  |  |  |  |  |  |  |  |  |  | 10 years | 10 years |  |
Share-based payments |  |  |  |  |  |  |  |  |  |  |  | $ 13,736,299 |  | 9,183,667 |
Included in exploration and evaluation assets [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payments |  |  |  |  |  |  |  |  |  |  |  | 3,119,563 |  | 3,309,791 |
Expensed to the statement of loss profit and comprehensive loss profit [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payments |  |  |  |  |  |  |  |  |  |  |  | 13,736,299 |  | 9,183,667 |
Dufferin Lake Property [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share issue related cos |  |  |  |  |  |  | $ 6,604 |  |  |  |  |  |  |  |
Common shares issued | shares |  |  |  |  |  |  | 111,110 |  |  |  |  |  |  |  |
Issue of shares for exploration and evaluation assets |  |  |  |  |  |  | $ 333,330 |  |  |  |  |  |  |  |
Percentage of remaining interest in exploration and evaluation of assets |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |
Reserves [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of options |  |  |  |  |  |  |  |  |  |  |  | 3,276,872 |  | 853,100 |
Share-based payments |  |  |  |  |  |  |  |  |  |  |  | $ 16,855,862 |  | $ 12,493,458 |
Options Exercised 1 [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised, shares | shares |  |  |  |  |  |  |  |  |  |  |  | 250,000 | 250,000 | 199,446 | 199,446
Exercise price |  |  |  |  |  |  |  |  |  |  |  | $ 0.30 |  |  |
Exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.24 |
Options Exercised 2 [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised, shares | shares |  |  |  |  |  |  |  |  |  |  |  | 5,975,000 | 5,975,000 | 100,000 | 100,000
Exercise price |  |  |  |  |  |  |  |  |  |  |  | $ 0.40 |  |  |
Exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.40 |
Options Exercised 3 [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised, shares | shares |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 | 1,100,000 | 50,000 | 50,000
Exercise price |  |  |  |  |  |  |  |  |  |  |  | $ 0.46 |  |  |
Exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.425 |
Options Exercised 4 [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised, shares | shares |  |  |  |  |  |  |  |  |  |  |  | 1,300,000 | 1,300,000 | 200,000 | 200,000
Exercise price |  |  |  |  |  |  |  |  |  |  |  | $ 0.50 |  |  |
Exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.46 |
Options Exercised 5 [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised, shares | shares |  |  |  |  |  |  |  |  |  |  |  | 500,000 | 500,000 | 300,000 | 300,000
Exercise price |  |  |  |  |  |  |  |  |  |  |  | $ 0.62 |  | $ 0.50 |
Options Exercised 6 [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised, shares | shares |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 | 1,000,000 | 83,333 | 83,333
Exercise price |  |  |  |  |  |  |  |  |  |  |  | $ 0.64 |  | $ 0.62 |
Options Exercised 7 [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised, shares | shares |  |  |  |  |  |  |  |  |  |  |  | 333,334 | 333,334 | 250,000 | 250,000
Exercise price |  |  |  |  |  |  |  |  |  |  |  | $ 1.51 |  | $ 0.64 |
Options Exercised 8 [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised, shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,667 | 16,667
Exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.24 |
Options Exercised 9 [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised, shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 58,333 | 58,333
Exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.65 |
Options Exercised 10 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised, shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 166,666 | 166,666
Exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.24 |

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