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Related party transactions (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Related Party Transaction [Line Items]  
Costs incurred from services rendered under marketing/consulting agreement $ 0.2
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%