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Notes Payable (Aggregate Future Minimum Principal Payments on Equipment Loan) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013
Notes Payable [Abstract]
2013 (remainder)	$ 286
2014	571
2015	571
2016	396
Total	$ 1,824

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 fourth rolling twelve months following the latest balance sheet presented.

+ References

No definition available.

+ Details

Name:	nvax_LoanAgreementFutureMinimumPaymentsDueInRollingYearFour
Namespace Prefix:	nvax_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of minimum loan payments maturing in the third rolling twelve months following the latest balance sheet presented.

+ References

No definition available.

+ Details

Name:	nvax_LoanAgreementFutureMinimumPaymentsDueInRollingYearThree
Namespace Prefix:	nvax_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of minimum loan payments maturing in the second rolling twelve months following the latest balance sheet presented.

+ References

No definition available.

+ Details

Name:	nvax_LoanAgreementFutureMinimumPaymentsDueInRollingYearTwo
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