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Common Shares - Warrants (Details) - Warrants [Member] - $ / shares
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Class of Warrant or Right [Line Items]    
Warrants outstanding (in shares) 7,408,101 0
Warrants issued 7,408,101  
Weighted average exercise price of warrants outstanding (in dollars per share) $ 1.25 $ 0
Weighted average exercise price of warrants issued (in dollars per share) $ 1.25  
Weighted average remaining life, warrants issued 3 years  
Weighted average remaining life, warrants outstanding 2 years 9 months 18 days 0 years