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Share-based compensation - Summary of Stock Option Activity and Related Information (Detail) - Options [member] | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 $ / shares | Dec. 31, 2019 $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of Options Outstanding, beginning of year | 89,178 | 287,996
Number of Options, Granted | 917,490 |
Number of Options, Forfeited | (44,714) | (198,818)
Number of Options Outstanding, end of year | 961,954 | 89,178
Number of Options Exercisable, end of year | 44,464 | 77,066
Weighted Average Exercise Price Outstanding, beginning of year | $ 10.41 | $ 25.34
Weighted Average Exercise Price, Granted | 0.56 |
Weighted Average Exercise Price, Forfeited | 12.06 | 32.04
Weighted Average Exercise Price, Outstanding, end of year | 0.94 | 10.41
Weighted Average Exercise Price, Exercisable, end of year | $ 8.74 | $ 10.67

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- Definition The number of share options outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_d&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_i&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_vi&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The number of share options exercisable in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph b -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_vii&doctype=Standard -URIDate 2020-01-01 + Details
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