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Related party transactions (Details) - USD ($) $ in Millions | 12 Months Ended
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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% |  |

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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 + Details
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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties. + References No definition available. + Details
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- Details
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- Details
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