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Share capital - Additional information (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended | 13 Months Ended | 15 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) shares | Sep. 30, 2020 CAD ($) shares | Jun. 25, 2020 USD ($) shares | Jun. 25, 2020 CAD ($) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 shares | Sep. 30, 2020 $ / shares | Jun. 25, 2020 $ / shares | Sep. 26, 2019 USD ($)
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares for cash, net of issuance costs | $ |  |  |  |  | $ 95,992,000 | $ 40,066,000 |  |  |  |  |
ATM Program |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Maximum issuance of common shares from treasury, value | $ |  |  |  |  |  |  |  |  |  |  | $ 125,000,000
Number of shares issued during period (in shares) | shares |  |  |  |  | 8,353,042 |  |  | 14,458,000 |  |  |
Issuance of common shares for cash, net of issuance costs | $ |  |  |  |  | $ 121,540,000 |  | $ 121,540,000 |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued during period (in shares) | shares |  |  | 384,616 | 384,616 |  |  |  |  |  |  |
Issuance of common shares for cash, net of issuance costs |  |  | $ 3,664,000 | $ 5,000 |  |  |  |  |  |  |
Value of shares issued during period (per share) |  |  |  |  |  |  |  |  |  | $ 13.00 |
Premium value (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.45 |
Premium value | $ |  |  | $ 127,000 |  |  |  |  |  |  |  |
Private Placement 1 |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued during period (in shares) | shares | 435,324 | 435,324 |  |  |  |  |  |  |  |  |
Issuance of common shares for cash, net of issuance costs | $ 5,248,000 | $ 7,000 |  |  |  |  |  |  |  |  |
Value of shares issued during period (per share) |  |  |  |  |  |  |  |  | $ 16.08 |  |
Premium value (in dollars per share) |  |  |  |  |  |  |  |  | 2.03 |  |
Private Placement 2 |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued during period (in shares) | shares | 176,160 | 176,160 |  |  |  |  |  |  |  |  |
Issuance of common shares for cash, net of issuance costs | $ 2,249,000 | $ 3,000 |  |  |  |  |  |  |  |  |
Value of shares issued during period (per share) |  |  |  |  |  |  |  |  | 17.03 |  |
Premium value (in dollars per share) |  |  |  |  |  |  |  |  | $ 2.98 |  |
September 30 Private Placements |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Premium value | $ | $ 1,056,000 |  |  |  |  |  | $ 1,056,000 |  |  |  |

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