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Share-based payment arrangements - Additional information (Details) $ / shares in Units, $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |
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Dec. 31, 2022 CAD ($) shares tranche $ / shares | Dec. 31, 2021 shares $ / shares | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) shares $ / shares | Dec. 31, 2020 shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Number of share options granted (in shares) | 1,265,672 | 1,091,891 |  |  |  |  |
Employee stock option plan |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Term of employee option plan | 5 years |  |  |  |  |  |
Number of tranches | tranche | 3 |  |  |  |  |  |
Vesting percentage on first anniversary | 33.33% |  |  |  |  |  |
Vesting percentage on second anniversary | 33.33% |  |  |  |  |  |
Vesting percentage on third anniversary | 33.33% |  |  |  |  |  |
Number of share options available to grant under the plan (in shares) | 4,043,166 | 4,427,408 |  |  |  |  |
Number of share purchase options vested and exercisable (in shares) | 1,834,985 | 2,254,702 |  |  |  |  |
Weighted average exercise price of share purchase options vested and exercisable (in Cdn$ per share) | $ / shares | $ 8.92 | $ 11.51 |  |  |  |  |
Weighted average share price at date of options exercised (in Cdn$ per share) | $ / shares | $ 13.64 | $ 13.26 |  |  |  |  |
Weighted average fair value per equity instrument granted (in $CDN per share) | $ |  |  | $ 6.29 |  | $ 5.62 |  |
Restricted share unit plan |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Maximum number of shares reserved for issue under options (in shares) |  |  |  | 5,000,000 |  |  |
Number of share purchased held in trust share-based payment arrangement (in shares) | 934,705 |  |  |  |  |  |
Common shares purchased (in shares) | 1,269,900 |  |  |  |  |  |
Market value | $ | $ 15,526,000 |  |  |  |  |  |
Number of share purchase options vested and exercisable (in shares) |  |  |  | 17,371 |  | 109,649 |
Restricted share units with no performance criteria |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Vesting percentage on first anniversary | 33.33% |  |  |  |  |  |
Vesting percentage on second anniversary | 33.33% |  |  |  |  |  |
Vesting percentage on third anniversary | 33.33% |  |  |  |  |  |
Number of share options granted in share-based payment arrangement (in shares) | 176,414 | 180,132 |  |  |  |  |
Weighted average fair value per equity instrument granted (in $CDN per share) | $ / shares | $ 14.44 |  |  |  |  |  |
Number of common shares equity instruments exercise into once vested (in shares) | 1 |  |  |  |  |  |
Number of shares outstanding |  |  |  | 328,677 |  | 471,762 | 478,067
Restricted Shares With Performance Criteria |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Term of employee option plan | 3 years |  |  |  |  |  |
Number of share options granted in share-based payment arrangement (in shares) | 229,979 | 440,508 |  |  |  |  |
Number of shares outstanding |  |  |  | 566,740 |  | 908,377 | 689,967
Restricted Shares With Performance Criteria | Bottom of range |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Performance target award (range) | 0.00% |  |  |  |  |  |
Restricted Shares With Performance Criteria | Top of range |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Performance target award (range) | 200.00% |  |  |  |  |  |
Restricted Shares With Performance Criteria, Performance Criteria Not Met |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Number of share options granted in share-based payment arrangement (in shares) | 0 |  |  |  |  |  |
Restricted Shares With Performance Criteria, Performance Criteria Met |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Number of share options granted in share-based payment arrangement (in shares) | 229,979 | 80,235 |  |  |  |  |
Deferred Share Units Plans |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Number of shares outstanding |  |  |  | 335,829 |  | 351,232 |
Liabilities from share-based payment transactions | $ |  |  |  | $ 2,803 |  | $ 3,291 |
Performance Share Unit |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Number of share options granted in share-based payment arrangement (in shares) | 616,920 | 267,936 |  |  |  |  |
Number of shares outstanding |  |  |  | 342,670 |  | 278,020 | 525,605
Performance Share Unit | Bottom of range |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Performance target award (range) | 0.00% |  |  |  |  |  |
Performance Share Unit | Top of range |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Performance target award (range) | 200.00% |  |  |  |  |  |
Performance Share Unit, Performance Criteria Not Met |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Number of share options granted in share-based payment arrangement (in shares) | 352,837 | 13,937 |  |  |  |  |
Weighted average fair value per equity instrument granted (in $CDN per share) | (per share) | $ 28.66 |  |  |  |  | $ 24.40 |
Performance Share Unit, Performance Criteria Met |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Number of share options granted in share-based payment arrangement (in shares) | 264,083 | 253,999 |  |  |  |  |
Number of shares authorized for issuance (in shares) | 3,126,000 |  |  |  |  |  |

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