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Master Services Agreement with Cadila (Details) (Cadila [Member], USD $) In Millions, unless otherwise specified | 9 Months Ended | 66 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2014
Related Party Transaction [Line Items] |  |
Basis limit for 50% payment of the portion of the shortfall | $ 2.0 |
Services purchased | 1.8 | 4.9
Services provided by CPLB on behalf of Cadila | 0.8 |
Maximum [Member] |  |
Related Party Transaction [Line Items] |  |
Total amount of services to be provided |  | 7.5
Payment for portion of shortfall | $ 2.0 |

X
- Definition Half Payment For Portion Of Shortfall Exceeding Two Million + References No definition available. + Details
Name: | nvax_HalfPaymentForPortionOfShortfallExceedingTwoMillion
Namespace Prefix: | nvax_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Master Service Agreement + References No definition available. + Details
Name: | nvax_MasterServiceAgreement
Namespace Prefix: | nvax_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Payment To Related Party Portion Of Shortfall + References No definition available. + Details
Name: | nvax_PaymentToRelatedPartyPortionOfShortfall
Namespace Prefix: | nvax_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Services Provided During The Period + References No definition available. + Details
Name: | nvax_ServicesProvidedDuringThePeriod
Namespace Prefix: | nvax_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Services Purchased + References No definition available. + Details
Name: | nvax_ServicesPurchased
Namespace Prefix: | nvax_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration