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License Agreements (Details)
£ in Thousands, $ in Thousands
 1 Months Ended
Mar. 31, 2018
GBP (£)
Mar. 31, 2016
shares
Sep. 30, 2014
USD ($)
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2018
GBP (£)
Sep. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Schedule Of License Agreements [Line Items]                
Accrued license fees payable | $       $ 638   $ 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