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Summary of significant accounting policies, Part 3 (Details) - BARDA [Member]
Dose in Millions, $ in Millions
Mar. 16, 2017
USD ($)
Dose
Sep. 30, 2016
USD ($)
BioThrax [Member]    
Product Information [Line Items]    
Amount of contract $ 100.0  
Period of performance 2 years  
Consideration allocated to procurement $ 93.6  
NuThrax [Member]    
Product Information [Line Items]    
Consideration allocated to development activities $ 137.1 $ 147.5
NuThrax [Member] | Minimum [Member]    
Product Information [Line Items]    
Number of doses to be delivered | Dose 2  
NuThrax [Member] | Maximum [Member]    
Product Information [Line Items]    
Number of doses to be delivered | Dose 3  
Discount on purchase price for doses to be procured $ 100.0