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Stock-based compensation - Restricted share unit plan (Details) - CAD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Performance restricted share units (PSUs) |  |
Number of units |  |
Beginning balance (in shares) | 426,569 | 492,557
Granted (in shares) | 116,775 | 112,079
Vested (in shares) | (111,630) | (178,067)
Ending balance (in shares) | 431,714 | 426,569
Weighted-average exercise price $ per share |  |
Outstanding, beginning of period (CAD per unit) | $ 12.06 | $ 8.86
Granted, Weighted average exercise price (CAD per unit) | 15.55 | 20.04
Vested, Weighted average exercise price (CAD per unit) | 14.13 | 8.24
Outstanding, end of period (CAD per unit) | $ 12.47 | $ 12.06
Vested (in shares) | 111,630 | 178,067
Liability classified restricted share unit plan | Restricted share units (RSUs) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Period for recognition in years following grant | 2 years |
Award vesting period | 3 years |
Restricted share unit plan | Restricted share units (RSUs) |  |
Number of units |  |
Beginning balance (in shares) | 553,411 | 641,471
Granted (in shares) | 167,631 | 144,383
Vested (in shares) | (169,689) | (220,116)
Forfeited (in shares) | (15,455) | (12,327)
Ending balance (in shares) | 535,898 | 553,411
Weighted-average exercise price $ per share |  |
Outstanding, beginning of period (CAD per unit) | $ 13.55 | $ 10.34
Granted, Weighted average exercise price (CAD per unit) | 15.55 | 19.97
Vested, Weighted average exercise price (CAD per unit) | 14.13 | 8.44
Forfeited, Weighted average exercise price (CAD per unit) | 13.41 | 13.01
Outstanding, end of period (CAD per unit) | $ 14.44 | $ 13.55
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements | $ 3,479 | $ 4,339
Period for award recognition | 1 year 3 months 18 days | 1 year 4 months 24 days
Vested (in shares) | 169,689 | 220,116
Restricted share unit plan | Performance restricted share units (PSUs) |  |
Number of units |  |
Vested (in shares) | (111,630) | (178,067)
Weighted-average exercise price $ per share |  |
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements | $ 3,251 | $ 3,702
Period for award recognition | 1 year 3 months 18 days | 1 year 6 months
Vested (in shares) | 111,630 | 178,067

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Subsequent to Year of Grant + References No definition available. + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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