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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