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Share capital - Additional information (Details) $ / shares in Units, $ in Thousands, $ in Thousands |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 14, 2022 USD ($) shares | Mar. 14, 2022 CAD ($) shares | Mar. 30, 2021 USD ($) shares | Mar. 30, 2021 CAD ($) shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Apr. 30, 2022 shares | Mar. 31, 2022 shares | Mar. 14, 2022 $ / shares | Mar. 30, 2021 $ / shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Issuance of common shares, net of issuance costs | $ |  |  |  |  | $ 14,101 | $ 14,552 |  |  |  |
Warrants exercised during the period (in shares) |  |  |  |  |  |  |  | 1,250,000 |  |
Warrants expired during period (in shares) |  |  |  |  |  |  |  | 500,000 |  |
Triangle Deposit Ramp Development |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Premium value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 2.00 |
Ordinary shares |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  |  |  |  |  | 19,037 |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Number of shares issued during period (in shares) | 442,700 | 442,700 | 1,100,000 | 1,100,000 |  |  |  |  |  |
Value of shares issued during period (per share) | $ / shares |  |  |  |  |  |  |  |  | 18.07 | $ 16.00
Issuance of common shares, net of issuance costs | $ 6,378 | $ 8,000 | $ 13,930 | $ 17,600 |  |  |  |  |  |
Premium value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | 4.19 | $ 2.82
Premium value | $ | $ 1,880 |  | $ 2,456 |  |  |  |  |  |  |
Private Placement | Triangle Deposit Ramp Development |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Number of shares issued during period (in shares) | 251,800 | 251,800 |  |  |  |  |  |  |  |
Value of shares issued during period (per share) | $ / shares |  |  |  |  |  |  |  |  | $ 15.88 |
Issuance of common shares, net of issuance costs | $ 3,189 | $ 4,000 |  |  |  |  |  |  |  |

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