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License agreement with Wyeth Holding Corporation (Details) (License agreement, Wyeth, USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
License agreement | Wyeth
  
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]  
Notice period required for termination of license agreement 90 days
Aggregate amount of payments made under license agreement $ 6.4nvax_AggregatePaymentsMadePerLicenseAgreement
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Expected milestone payment associated with the first Phase 3 clinical trial $ 3.0nvax_EstimatedMilestonePayments
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