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Related party transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]      
Costs incurred from services rendered under marketing/consulting agreement $ 0.2    
Expenses incurred under agreement $ 0.0 $ 0.0 $ 0.0
Saudi Arabia [Member]      
Related Party Transaction [Line Items]      
Percentage of net sales of biodefense products subject to payment to related party 17.50%    
Qatar [Member]      
Related Party Transaction [Line Items]      
Percentage of net sales of biodefense products subject to payment to related party 15.00%    
United Arab Emirates [Member]      
Related Party Transaction [Line Items]      
Percentage of net sales of biodefense products subject to payment to related party 15.00%