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Warrant Derivative (Tables)

12 Months Ended

Dec. 31, 2021

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