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Organization and Basis of Presentation Liquidity (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2016
Procurement Contract [Line Items] |  |
Reduced holdback amount |  | $ 40.9
Scenario, Forecast | BARDA Contract |  |
Procurement Contract [Line Items] |  |
Reduced holdback amount | $ 41.0 |

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- Definition Procurement Contract [Line Items] + References No definition available. + Details
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- Definition Reduced holdback be received from BARDA + References No definition available. + Details
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- Details
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- Details
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Namespace Prefix: |
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Period Type: |