Government grants - Additional Information (Detail) $ in Millions	9 Months Ended
Sep. 30, 2020 CAD ($)
Government Grants [Abstract]
Income from government grants	$ 2.8
Reduction to operating costs	1.8
Reduction to general and administrative costs	$ 0.6

The amount of income recognised in relation to government grants. [Refer: Government grants]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 20
-IssueDate 2020-01-01
-Paragraph 39
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=20&code=ifrs-tx-2020-en-r&anchor=para_39_b&doctype=Standard
-URIDate 2020-01-01

Name:	ifrs-full_RevenueFromGovernmentGrants
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration