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Other Financial Information (Accrued Expenses) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Employee benefits and compensation	$ 8,597	$ 5,323
Research and development accruals	9,826nvax_ResearchAndDevelopmentAccruals	3,657nvax_ResearchAndDevelopmentAccruals
Other accrued expenses	974us-gaap_OtherAccruedLiabilitiesCurrent	1,431us-gaap_OtherAccruedLiabilitiesCurrent
Accrued expenses	$ 19,397us-gaap_AccruedLiabilitiesCurrent	$ 10,411us-gaap_AccruedLiabilitiesCurrent

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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