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Common Shares - Summary Of The Status Of Unvested Stock Options (Details) - $ / shares | 9 Months Ended | 12 Months Ended
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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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- Definition 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. + References No definition available. + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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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 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options outstanding. + References No definition available. + Details
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- Definition 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. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average grant-date fair value of options vested. + References No definition available. + Details
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