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Segment information (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) Segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Aug. 06, 2015 Segment
Segment Reporting Information [Line Items] |  |  |  |
Number of independent publicly-traded companies | Segment |  |  |  | 2
Number of business segments | Segment | 1 |  |  |
Long-lived assets | $ | $ 1,070,206 | $ 970,111 |  |
Revenue [Member] | United States [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Concentration risk percentage | 89.00% | 94.00% | 96.00% |
Revenue [Member] | Biothrax [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Concentration risk percentage | 67.00% | 80.00% | 89.00% |
Foreign Jurisdictions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Long-lived assets | $ |  | $ 28,600 | $ 28,400 |

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