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Share capital - Changes in stock option plan (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2021 shares $ / shares | Dec. 31, 2020 shares $ / shares
Disclosure of classes of share capital [abstract] |  |
Beginning balance (in shares) | shares | 4,835 | 5,578
Granted (in shares) | shares | 1,708 | 2,329
Exercised (in shares) | shares | (203) | (32)
Forfeited (in shares) | shares | (339) | (677)
Expired (in shares) | shares | (245) | (2,363)
Ending balance (in shares) | shares | 5,756 | 4,835
Beginning balance (in CAD per share) | $ / shares | $ 1.59 | $ 2.81
Granted (in CAD per share) | $ / shares | 2.06 | 1.20
Exercised (in CAD per share) | $ / shares | 1.18 | 1.17
Forfeited (in CAD per share) | $ / shares | 2.00 | 4.06
Expired (in CAD per share) | $ / shares | 4.82 | 3.45
Ending balance (in CAD per share) | $ / shares | $ 1.58 | $ 1.59

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- Definition The number of share options exercised in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_iv&doctype=Standard -URIDate 2021-03-24 + Details
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