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Events after the reporting date (Details)
$ in Millions
 1 Months Ended
Feb. 07, 2022
$ / shares
Jan. 31, 2022
shares
$ / shares
Feb. 23, 2022
USD ($)
Share Transactions [Member]      
Restricted Shares [Abstract]      
Number of shares, awarded (in shares)   697,953  
Number of shares, vested in year one (in shares)   149,588  
Number of shares, vested in year two (in shares)   149,588  
Number of shares, vested in year three (in shares)   124,594  
Number of shares, vested in year four (in shares)   149,589  
Number of shares, vesting subject to certain market conditions (in shares)   124,594  
Number of shares, vesting in year one to three (in shares)   573,359  
Number of shares granted, share price (in dollars per share) | $ / shares   $ 4.29  
Share Transactions [Member] | Board of Directors [Member]      
Restricted Shares [Abstract]      
Number of shares, awarded (in shares) | $ / shares   175,000  
Dividend Declared for Q1 [Member]      
Dividend [Abstract]      
Dividend declare date Feb. 07, 2022    
Dividend declared (in dollars per share) | $ / shares $ 0.02    
Dividends payable date Feb. 24, 2022    
Dividend record date Feb. 17, 2022    
Total dividend payment | $     $ 3.3