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Warrant liability - Warrants information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
May 28, 2019
shares
Mar. 07, 2019
Dec. 20, 2018
shares
Oct. 27, 2017
£ / shares
shares
May 26, 2017
£ / shares
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
shares
Warrants information                  
Number of shares issued for warrant exercise 171,480                
Remaining warrants exercisable 80,000           80,000   80,000
Number of shares into which remaining warrants is exercisable 114,320                
Change in fair value of preferred stock warrant liability | $           $ 0 $ 2,200 $ 0 $ 5,381
Other expenses                  
Warrants information                  
Change in fair value of preferred stock warrant liability | $                 $ 100
Series A Preferred Shares                  
Warrants information                  
Numbers of warrants issued         200,000        
Exercise price of warrants | £ / shares         £ 0.01        
Warrants exercisable term         10 years        
Warrants expiration term following an IPO or exit         12 months        
Number of warrants exercised 120,000                
Series B1 Preferred Shares                  
Warrants information                  
Numbers of warrants issued     194,911 115,384 627,903        
Exercise price of warrants | £ / shares       £ 0.01 £ 0.01        
Number of shares issued for warrant exercise 531,077                
Number of shares issued (in shares)       384,615 3,562,583        
Share issue price | £ / shares         £ 11.2278        
Number of warrants surrendered     194,911            
Percentage of warrants exercisable in conjunction with the IPO   50.00%              
Percentage of warrants to expire in conjunction with the IPO   50.00%