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Warrant Derivative (Tables) | 12 Months Ended
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Dec. 31, 2020
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 $
Issued, August 16, 2019 | 4,619,773 |  | 1,657,214 |
Exercised | (2,935,647) |  | (5,687,003) |
Change in fair value | — |  | 12,608,808 |
Foreign exchange impact | — |  | (70,255) |
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 |
The estimated fair value of the warrant derivative was determined using the following assumptions:
| December 31, 2020 | December 31, 2019
Fair value per warrant | US$1.57 | US$3.89
Underlying share price | US$2.38 | US$4.76
Risk-free interest rate | 0.10% | 1.59%
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 2020-01-01 -Paragraph 93 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93&doctype=Standard -URIDate 2020-01-01 + Details
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