Annual reports filed by certain Canadian issuers pursuant to Section 15(d) and Rule 15d-4

Share capital - Weighted average assumptions (Details)

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Share capital - Weighted average assumptions (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share capital [Abstract]    
Annualized volatility 52.00% 55.00%
Risk-free interest rate 1.61% 2.04%
Life of options in years 4 4
Estimated forfeiture rate, share options granted 15.60% 22.40%
Expected dividend as percentage, share options granted 0.00% 0.00%
Exercise price of options granted (in dollars per share) $ 6.14 $ 5.29
Market price on date of grant, share options granted $ 6.14 $ 5.29
Share options granted, fair value $ 2.56 $ 2.89