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Share-Based Payments - Summary of RSU Activity (Detail)	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options outstanding, Granted during the period	75,600
Number of stock options outstanding, Beginning Balance	2,610,510
Number of stock options outstanding, Forfeited during the period	(100,400)
Number of stock options outstanding, Ending Balance	2,585,710
BSA Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value, Expired during the period | $ / shares	$ (500)
Number of warrants outstanding, Beginning Balance	218,008
Number of stock options outstanding, Granted during the period	39,185
Number of warrants outstanding, Exercised/released during the period	0
Number of warrants outstanding, Ending Balance	256,693
BCE Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of warrants outstanding, Beginning Balance	5,500
Number of warrants outstanding, Exercised/released during the period	(5,500)
Number of warrants outstanding, Ending Balance	0
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU outstanding, Beginning Balance	1,118,745
Number of RSU outstanding, Granted during the period	44,900
Number of RSU outstanding, Forfeited during the period	(59,500)
Number of RSU outstanding, Ending Balance	1,104,145

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-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=120381028&loc=d3e5070-113901

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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).

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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.

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