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Share capital and reserves - Founder Preferred Shares Annual Dividend Amount and Warrant Redemption Amount (Details)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2021
vote
$ / shares
shares
Dec. 31, 2018
Dec. 31, 2015
$ / shares
Dec. 31, 2020
$ / shares
Disclosure of classes of share capital [line items]            
Preferred stocks issued (in shares) | shares     1,500,000      
Number of votes per Founder Preferred Share | vote     1      
Preference shares, dividend payment terms, weighted average share price, minimum term required         10 days  
Preferred stock, conversion terms, weighted average share price (in dollars per share) | $ / shares         $ 11.50  
Percentage increase in dividend price 20.00% 20.00% 20.00%      
Preference shares, conversion ratio       1    
Founder Preferred shares | Issued Capital and Capital Reserve            
Disclosure of classes of share capital [line items]            
Par value per share | $ / shares     $ 10.00     $ 10.00
Founder entities            
Disclosure of classes of share capital [line items]            
Preferred stocks issued (in shares) | shares     750,000