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Common Shares - Summary Of The Status Of Unvested Stock Options (Details) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Number of options (in shares)		50,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested, Number of options, beginning of period (in shares)	33,333	514,004
Granted, Number of options (in shares)		50,000
Vested, Number of options (in shares)	(33,333)	(530,671)
Unvested, Number of options, end of period (in shares)		33,333	514,004
Unvested, Weighted average grant date fair value, beginning of period (in dollars per share)	$ 0.31	$ 0.40
Granted, Weighted average grant-date fair value per option (in dollars per share)		0.20
Vested, Weighted average grant-date fair value per option (in dollars per share)	$ 0.31	0.38
Unvested, Weighted average grant date fair value per option, end of period (in dollars per share)		$ 0.31	$ 0.40
Weighted average remaining amortization period	0 years	3 months	7 months 9 days

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Gross number of share options (or share units) granted during the period.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ 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)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Number of non-vested options outstanding.

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Weighted average grant-date fair value of non-vested options outstanding.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Weighted average grant-date fair value of options vested.

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Non vested options at the beginning of the period that vest during the period.

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