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Share Option and Warrant Reserves (Details 3) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 shares yr $ / shares | Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares $ / shares
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of options outstanding | shares | 8,141,004 | 5,602,619 | 4,192,253
Options outstanding, exercise price | $ / shares | $ 2.67 | $ 2.96 | $ 2.74
Options outstanding, remaining contractual life | 3 years 5 months 23 days |  |
Number of options exercisable | shares | 4,989,454 |  |
Options exercisable, exercise price | $ / shares | $ 2.80 |  |
Options exercisable, remaining contractual life | yr | 2.62 |  |
Exercise Price Range 1 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of options outstanding | shares | 1,596,218 |  |
Options outstanding, exercise price | $ / shares | $ 1.68 |  |
Options outstanding, remaining contractual life | 3 years 10 months 28 days |  |
Number of options exercisable | shares | 1,418,418 |  |
Options exercisable, exercise price | $ / shares | $ 1.49 |  |
Options exercisable, remaining contractual life | yr | 3.74 |  |
Exercise Price Range 2 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of options outstanding | shares | 6,308,503 |  |
Options outstanding, exercise price | $ / shares | $ 2.68 |  |
Options outstanding, remaining contractual life | 3 years 5 months 16 days |  |
Number of options exercisable | shares | 3,334,753 |  |
Options exercisable, exercise price | $ / shares | $ 2.90 |  |
Options exercisable, remaining contractual life | yr | 2.26 |  |
Exercise Price Range 3 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of options outstanding | shares | 207,113 |  |
Options outstanding, exercise price | $ / shares | $ 8.60 |  |
Options outstanding, remaining contractual life | 1 year 22 days |  |
Number of options exercisable | shares | 207,113 |  |
Options exercisable, exercise price | $ / shares | $ 8.60 |  |
Options exercisable, remaining contractual life | yr | 1.06 |  |
Exercise Price Range 4 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of options outstanding | shares | 29,170 |  |
Options outstanding, exercise price | $ / shares | $ 12.94 |  |
Options outstanding, remaining contractual life | 3 months 25 days |  |
Number of options exercisable | shares | 29,170 |  |
Options exercisable, exercise price | $ / shares | $ 12.94 |  |
Options exercisable, remaining contractual life | yr | .32 |  |

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- Definition The number of share options outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_d&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_i&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_vi&doctype=Standard -URIDate 2019-03-27 + Details
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