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Related Party Transactions (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
GBP (£)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2018
GBP (£)
Related Party Transaction            
Professional fees $ 200,000   $ 1,000,000 $ 500,000    
Affiliated Entity | Syncona LLP            
Related Party Transaction            
Related party expense     60,000 56,000 $ 200,000  
Due to related party     13,000 3,000    
Affiliated Entity | University College London and Related Entities            
Related Party Transaction            
Due to related party       200,000    
Related party transactions       700,000 2,400,000  
Affiliated Entity | University College London and Related Entities | License fees            
Related Party Transaction            
Related party transactions       40,000 1,500,000  
Affiliated Entity | Arix Bioscience            
Related Party Transaction            
Related party expense 0   18,000 20,000 $ 11,000  
Due to related party 0   0 2,000    
Affiliated Entity | Kapil Dhingra, M.D.            
Related Party Transaction            
Due to related party $ 3,000   $ 46,000 $ 32,000    
Professional fees | £   £ 10,000        
Incremental rate for professional fees | £           £ 1,111