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Acquisition (Narrative) (Details) - USD ($) $ in Thousands, shares in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2014
Novavax shares issued for Isconova AB shares acquired | 15.6 |  |  |  |
Value of shares of Novavax Common Stock issued | $ 41,900 |  |  |  |
Cash paid to Isconova warrant holders |  | $ 0 | $ 171 | $ 0 |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 17 years |  |  |  |
Business Acquisition Percentage of Voting Interests Acquired During Period | 99.50% |  |  |  |
Other Liabilities, Current |  | 1,598 | $ 70 |  |
Novavax AB [Member] |  |  |  |  |
Cash paid to Isconova warrant holders | $ 22,000 |  |  |  |
Business Acquisition Percentage of Voting Interests Acquired During Period |  |  |  |  | 0.50%
Other Liabilities, Current |  | $ 1,500 |  |  |
Proprietary Adjuvant Technology [Member] [Member] |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 20 years |  |  |  |
Maximum [Member] |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 20 years |  |  |  |
Minimum [Member] |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 12 years |  |  |  |

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