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Share based compensation - Share Options Activity (Details) - $ / shares | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2021 | Mar. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Number |  |  |  |  |
Outstanding at beginning balance (in shares) |  |  | 885,000 |  |
Granted during the year (in shares) |  |  | 5,150,000 |  |
Forfeited during the year (in shares) |  |  | (105,500) |  |
Expired during in period (in shares) |  |  | (259,500) |  |
Outstanding at ending balance (in shares) |  |  | 5,670,000 | 885,000 |
Weighted Avg. Fair Value Price (in $) |  |  |  |  |
Outstanding at beginning balance (in dollars per share) |  |  | $ 1.91 |  |
Granted during the year (in dollars per share) |  |  | 0.51 |  |
Forfeited during the year (in dollars per share) |  |  | 1.24 |  |
Expired during the year (in dollars per share) |  |  | 3.19 |  |
Outstanding at ending balance (in dollars per share) |  |  | $ 0.64 | $ 1.91 |
Share options |  |  |  |  |
Number |  |  |  |  |
Outstanding at beginning balance (in shares) |  |  | 885,000 | 1,178,750 | 1,307,500
Granted during the year (in shares) |  |  | 5,150,000 | 0 | 230,000
Forfeited during the year (in shares) |  |  | (105,500) | (293,750) | (358,750)
Expired during in period (in shares) |  |  | (259,500) | 0 | 0
Outstanding at ending balance (in shares) |  |  | 5,670,000 | 885,000 | 1,178,750
Exercisable (in shares) |  |  | 411,244 | 572,000 | 405,500
Weighted Avg. Exercise Price (in $) |  |  |  |  |
Outstanding at beginning balance (in dollars per share) |  |  | $ 41.86 | $ 41.84 | $ 44.00
Granted during the year (in dollars per share) | $ 2.00 | $ 35.00 | 2.00 | 0 | 35.00
Forfeited during the year (in dollars per share) |  |  | 23.21 | 41.78 | 44.68
Expired during the year (in dollars per share) |  |  | 20.32 | 0 | 0
Outstanding at ending balance (in dollars per share) |  |  | 5.66 | 41.86 | 41.84
Exercisable (in dollars per share) |  |  | $ 41.75 | $ 40.54 | $ 40.08

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period, Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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 (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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 options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired. + References No definition available. + Details
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