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Acquisition of Novavax AB (Narrative) (Details) (USD $) | 9 Months Ended |  |  | 1 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Jul. 31, 2013 Novavax AB [Member] | Sep. 30, 2014 Novavax AB [Member]
Business Acquisition [Line Items] |  |  |  |  |  |
Shares acquired in Novavax AB |  |  |  |  |  | 0.50%
Goodwill before retroactive adjustment |  |  |  |  | $ 26,200,000 |
Ownership percentage | 20.00% |  |  |  |  |
Goodwill | 56,174,000 | 58,759,000 | 58,707,000 | 33,141,000 | 25,400,000 |
Currency translation and other adjustments | $ (2,533,000) | $ 320,000 |  |  | $ (800,000) |

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