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Warrant Derivative (Tables) | 12 Months Ended
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Dec. 31, 2021
Disclosure of Share Capital, Reserves And Other Equity Interest [Abstract] |
Reconciliation of change in fair value of warrant derivative | A reconciliation of the change in fair value of the warrant derivative is as follows:
| Number of Warrants Outstanding |  | Fair Value of Warrant Derivative
As at December 31, 2019 | 1,684,126 |  |  | $ | 8,508,764 |
Exercised | (1,418,369) |  |  | (4,636,317) |
Change in fair value | — |  |  | (3,491,928) |
Foreign exchange impact | — |  |  | 150,709 |
As at December 31, 2020 | 265,757 |  |  | $ | 531,228 |
Exercised | (201,722) |  |  | (455,670) |
Change in fair value | — |  |  | (17,117) |
Foreign exchange impact | — |  |  | (2,424) |
As at December 31, 2021 | 64,035 |  |  | $ | 56,017 |
The estimated fair value of the warrant derivative at December 31 was determined using the following assumptions:
| 2021 |  | 2020
Fair value per warrant | US$0.69 |  | US$1.57
Underlying share price | US$1.39 |  | US$2.38
Risk-free interest rate | 0.39% |  | 0.10%
Expected hold period to exercise | 1.0 year |  | 1.0 year
Expected share price volatility | 90.00% |  | 90.00%
Expected dividend yield | Nil |  | Nil

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- Definition The disclosure of the fair value measurement of liabilities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2021-01-01 -Paragraph 93 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_93&doctype=Standard -URIDate 2021-03-24 + Details
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