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Contributed surplus - Fair value of share option awards (Details)
12 Months Ended
Nov. 09, 2021
Y
$ / shares
Aug. 05, 2021
Y
$ / shares
May 14, 2021
Y
$ / shares
Feb. 17, 2021
Y
$ / shares
Feb. 03, 2020
Y
$ / shares
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Calculation of fair value and assumptions                
Fair value of stock options granted, per share | $ / shares $ 4.38 $ 5.72 $ 6.10 $ 9.03 $ 5.50      
Volatility assumption 44.34% 45.01% 45.92% 46.36% 46.12%      
Remaining life assumption | Y 10 10 10 10 10      
Expected dividend yield assumption 0.00% 0.00% 0.00% 0.00% 0.00%      
Forfeiture rate assumption 5.15% 5.15% 4.05% 4.39% 0.00%      
Annual risk-free interest rate assumption 1.46% 1.23% 1.63% 1.11% 2.02%      
Unrecognized compensation cost                
Compensation cost not yet recognized | $           $ 190,536 $ 926,317 $ 530,357
Remaining average vesting period for unrecognized compensation           8 months 8 days 1 year 8 months 26 days 6 months 21 days