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Manufacturing, Laboratory and Office Facility (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 23 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2013 | Nov. 30, 2011
Manufacturing Laboratory and Office Facility [Abstract] |  |  |
Tenant improvement allowance |  |  | $ 2,500
Additional tenant improvement allowance |  |  | 3,000
Amount funded from tenant allowance | $ 700 | $ 5,000 |

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- Definition Additional tenant improvement allowance + References No definition available. + Details
Name: | nvax_AdditionalTenantImprovementAllowance
Namespace Prefix: | nvax_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | nvax_ManufacturingLaboratoryAndOfficeFacilityAbstract
Namespace Prefix: | nvax_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Tenant Improvement Allowance + References No definition available. + Details
Name: | nvax_TenantImprovementAllowance
Namespace Prefix: | nvax_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Net cash outflow or inflow from monetary allowance granted by the landlord to a tenant to entice tenant to move into landlords building which will enable the tenant to prepare the leased premises for tenants occupancy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
Name: | us-gaap_PaymentsForProceedsFromTenantAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration