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Financial instruments, Interest-bearing loans and borrowings (Details)
£ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
GBP (£)
Tranche
Nov. 06, 2020
USD ($)
Tranche
Mar. 31, 2020
USD ($)
Mar. 02, 2020
USD ($)
Dec. 31, 2019
GBP (£)
Dec. 31, 2019
USD ($)
Sep. 13, 2017
USD ($)
Financial liabilities: interest-bearing loans and borrowings [Abstract]                
Borrowings | £   £ 36,654       £ 0    
Oxford Finance Agreement [Member]                
Financial liabilities: interest-bearing loans and borrowings [Abstract]                
Borrowings, maximum capacity     $ 100,000,000          
Number of tranches | Tranche     3          
Maturity date for monthly payments of principal and interest Nov. 30, 2025              
Accrued interest and a prepayment fee $ 10,000,000              
Oxford Finance Agreement [Member] | LIBOR [Member]                
Financial liabilities: interest-bearing loans and borrowings [Abstract]                
Borrowings, interest rate   8.85%            
Oxford Finance Agreement [Member] | LIBOR [Member] | Bottom of Range [Member]                
Financial liabilities: interest-bearing loans and borrowings [Abstract]                
Borrowings, interest rate   9.01%            
Oxford Finance Agreement [Member] | LIBOR [Member] | Top of Range [Member]                
Financial liabilities: interest-bearing loans and borrowings [Abstract]                
Borrowings, interest rate   12.01%            
Oxford Finance Agreement, Tranche One [Member]                
Financial liabilities: interest-bearing loans and borrowings [Abstract]                
Borrowings     $ 50,000,000          
Oxford Finance Agreement, Tranche Two [Member]                
Financial liabilities: interest-bearing loans and borrowings [Abstract]                
Borrowings     25,000,000          
Oxford Finance Agreement, Tranche Three [Member]                
Financial liabilities: interest-bearing loans and borrowings [Abstract]                
Borrowings, remaining amount     $ 25,000,000          
Gates Foundation Convertible Loan [Member]                
Financial liabilities: interest-bearing loans and borrowings [Abstract]                
Borrowings, maximum capacity               $ 40,000,000
Number of tranches | Tranche   2            
Borrowings       $ 25,000,000 $ 25,000,000   $ 25,500,000  
Borrowings interest rate for first twelve months   2.00%            
Borrowings interest rate after one year   0.00%            
Gates Foundation Convertible Loan [Member] | First Tranche [Member]                
Financial liabilities: interest-bearing loans and borrowings [Abstract]                
Borrowings         $ 25,000,000      
Borrowings interest rate for first twelve months           2.00% 2.00%