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Warrant Derivative (Tables)
 12 Months Ended
Dec. 31, 2023
Disclosure of Share Capital, Reserves And Other Equity Interest [Abstract]  
Reconciliation of change in fair value of warrant derivative
Changes in the value of our warrant derivative were as follows:
Number of Warrants OutstandingFair Value of Warrant Derivative
As at December 31, 202164,035 $56 
Change in fair value— 20 
Foreign exchange impact— 3 
As at December 31, 202264,035 $79 
Issued pursuant to public offering7,667,050 7,360 
Discount on warrants issued— (1,822)
Amortization of discount on warrants issued— 146 
Change in fair value — (5,431)
Foreign exchange impact— (132)
As at December 31, 20237,731,085 $200 
The following table summarizes our outstanding warrant derivative as at December 31, 2023:
Exercise priceIssuance dateExpiry dateNumber of Warrants Outstanding
US$0.90August 16, 2019August 16, 202464,035 
US$2.81August 8, 2023August 8, 20286,667,000 
US$2.81September 7, 2023August 8, 20281,000,050 
7,731,085 
The estimated fair value of the warrant derivative with an exercise price of US$2.81 was determined using the following assumptions:
December 31, 2023September 7,
2023		August 8,
2023
Underlying share priceUS$1.35US$2.39US$2.26
Risk-free interest rate3.2%3.9%3.8%
Expected life4.6 years5.0 years5.0 years
Expected volatility36.5%36.5%36.5%
Expected dividend yieldNilNilNil
Fair value per warrantUS$0.18US$0.79US$0.70