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Share-based payment arrangements - Additional Information (Details) $ in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 20, 2018 OptionPlans | Dec. 31, 2019 USD ($) shares Options Tranches | Dec. 31, 2018 USD ($) shares Options | Dec. 31, 2019 CAD ($) shares Options | Dec. 31, 2018 CAD ($) shares Options | Dec. 31, 2017 Options
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Number of share options exercised in share-based payment arrangement (in shares) | shares |  | 56,644 | 0 |  |  |
Employee stock option plan |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Number of share option plans | OptionPlans | 2 |  |  |  |  |
Term of employee option plan |  | 5 years |  |  |  |
Number of tranches | Tranches |  | 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) | shares |  | 3,748,454 | 3,928,361 |  |  |
Weighted average exercise price of share purchase options vested and exercisable (in Cdn$ per share) | $ |  |  |  | $ 10.43 |  |
Weighted average fair value per stock option (in Cdn$ per share) | $ |  |  |  | $ 2.19 | $ 2.32 |
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 |  | 5,000,000 |  |
Number of share purchased held in trust share-based payment arrangement (in shares) | shares |  | 370,549 | 508,127 |  |  |
Number of share purchase options vested and exercisable (in shares) | shares |  | 29,111 | 29,371 | 29,111 | 29,371 |
Restricted Shares Without 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) |  | 391,092 | 214,859 |  |  |
Weighted average fair value per stock option (in Cdn$ per share) | $ |  |  |  | $ 5.68 |  |
Number of shares outstanding (in shares) |  | 536,330 | 333,119 | 536,330 | 333,119 | 341,198
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) |  | 412,473 | 167,976 |  |  |
Number of shares outstanding (in shares) |  | 457,498 | 152,927 | 457,498 | 152,927 | 0
Restricted Shares With Performance Criteria | Bottom of range |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Performance target award range (as a percent) |  | 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 (as a percent) |  | 200.00% |  |  |  |
Deferred Share Units Plans |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Trading days |  | 15 days |  |  |  |
Number of shares outstanding (in shares) |  | 362,433 | 234,125 | 362,433 | 234,125 |
Liabilities from share-based payment transactions | $ |  | $ 2,911 | $ 686 |  |  |
Performance share unit |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Maximum number of shares reserved for issue under options (in shares) |  | 626,000 |  | 626,000 |  |
Number of share options granted in share-based payment arrangement (in shares) |  | 264,083 | 261,522 |  |  |
Number of shares outstanding (in shares) |  | 610,885 | 484,899 | 610,885 | 484,899 | 381,293
Performance share unit | Bottom of range |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Performance target award range (as a percent) |  | 0.00% |  |  |  |
Performance share unit | Top of range |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Performance target award range (as a percent) |  | 200.00% |  |  |  |
PSU Plan, 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) |  |  | 261,523 |  |  |

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