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Related party transactions (Details) (USD $)
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12 Months Ended | ||||
|---|---|---|---|---|---|
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Dec. 31, 2013
Saudi Arabia [Member]
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Dec. 31, 2013
Qatar [Member]
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Dec. 31, 2013
United Arab Emirates [Member]
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Dec. 31, 2011
Family Members of Executive Chairman [Member]
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Dec. 31, 2011
Member of Board of Directors [Member]
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| Related Party Transaction [Line Items] | |||||
| Percentage of net sales of biodefense products subject to payment to related party (in hundredths) | 17.50% | 15.00% | 15.00% | ||
| Costs incurred from services rendered under marketing/consulting agreement | $ 35,000 | $ 225,000 | |||