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Warrant Derivative (Tables)
 12 Months Ended
Dec. 31, 2019
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

The estimated fair value of the warrant derivative was determined using the following assumptions:
 
December 31, 2019
August 16, 2019
Fair value per warrant
US$3.89
US$0.27
Underlying share price
US$4.76
US$0.54
Risk-free interest rate
1.59%
1.42%
Expected hold period to exercise
1.0 year
4.0 years
Expected share price volatility
90.00%
82.00%
Expected dividend yield
Nil
Nil