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Stock-based compensation - Share options plan (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 $ / shares shares | Dec. 31, 2019 CAD ($) shares | Dec. 31, 2018 $ / shares | Dec. 31, 2018 CAD ($) shares
Number of options |  |  |  |
Exercised (in shares)) |  | (327,000) |  | (297,940)
Weighted average exercise price $ per share |  |  |  |
Proceeds from options exercised | $ |  | $ 1,953 |  | $ 1,023
Share option plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized for issuance (in shares) | 2,495,619 | 2,495,619 |  |
Number of options |  |  |  |
Beginning balance (in shares) |  | 565,600 |  | 913,540
Exercised (in shares)) |  | (327,000) |  | (297,940)
Forfeited or expired (in shares) |  |  |  | (50,000)
Ending balance (in shares) |  | 238,600 |  | 565,600
Weighted average exercise price $ per share |  |  |  |
Beginning balance (CAD per share) | $ / shares |  |  | $ 5.36 |
Exercised (CAD per share) | $ / shares | $ 5.97 |  | 3.43 |
Forfeited or expired (CAD per share) | $ / shares |  |  | $ 16.46 |
Ending balance (CAD per share) | $ / shares | $ 4.61 |  |  |
Proceeds from options exercised | $ |  | $ 1,953 |  | $ 1,023
Total intrinsic value of options exercised | $ |  | $ 3,274 |  | $ 1,351

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- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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