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License Agreements (Details)
£ in Thousands, $ in Thousands
 1 Months Ended
Mar. 31, 2016
GBP (£)
shares
Sep. 30, 2014
USD ($)
shares
Sep. 30, 2018
USD ($)
Sep. 30, 2018
GBP (£)
Mar. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Schedule Of License Agreements [Line Items]            
Accrued license fees payable | $     $ 653   $ 500 $ 0
UCLB            
Schedule Of License Agreements [Line Items]            
Shares issued (shares) | shares 313,971 1,497,643        
Payment of upfront fees £ 1,500 $ 300        
Annual license fee payments       £ 30    
UCLB | Regulatory Approval            
Schedule Of License Agreements [Line Items]            
Conditional payment, regulatory approval       35,500    
UCLB | Net Sales Levels            
Schedule Of License Agreements [Line Items]            
Conditional payment, regulatory approval       51,000    
UCLB | Product Sales            
Schedule Of License Agreements [Line Items]            
Conditional payment, regulatory approval       18,000    
UCLB | Product Sales | Minimum            
Schedule Of License Agreements [Line Items]            
Conditional payment, regulatory approval       1,000    
UCLB | Product Sales | Maximum            
Schedule Of License Agreements [Line Items]            
Conditional payment, regulatory approval       £ 18,500