v2.4.0.6
Document and Entity Information (USD $)
12 Months Ended
Dec. 31, 2011
Mar. 08, 2012
Jun. 30, 2011
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2011    
Document Fiscal Year Focus 2011    
Document Fiscal Period Focus FY    
Trading Symbol NVAX    
Entity Registrant Name NOVAVAX INC    
Entity Central Index Key 0001000694    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   121,571,186  
Entity Public Float     $ 172,600,000