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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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Percentage of voting equity interests acquired during the period in the business combination.

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Amount before retroactive adjustment of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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-Publisher FASB

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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