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Notes Payable (Aggregate Future Minimum Principal Payments on Equipment Loan) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013
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Notes Payable [Abstract] |
2013 (remainder) | $ 143
2014 | 571
2015 | 571
2016 | 396
Total | $ 1,681

X
- Definition Amount of minimum loan payments. + References No definition available. + Details
Name: | nvax_LoanAgreementFutureMinimumPaymentsDue
Namespace Prefix: | nvax_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of minimum loan payments maturing in the third fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | nvax_LoanAgreementFutureMinimumPaymentsDueInYearThree
Namespace Prefix: | nvax_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of minimum loan payments maturing in the second fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | nvax_LoanAgreementFutureMinimumPaymentsDueInYearTwo
Namespace Prefix: | nvax_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of minimum loan payments maturing in the next fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | nvax_LoanAgreementFutureMinimumPaymentsNextTwelveMonths
Namespace Prefix: | nvax_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of minimum loan payments maturing in the remainder of the fiscal year following the latest fiscal year ended. + References No definition available. + Details
Name: | nvax_LoanAgreementFutureMinimumPaymentsRemainderOfFiscalYear
Namespace Prefix: | nvax_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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