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Facility Leases (Narrative) (Details) $ in Millions | 1 Months Ended
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May 31, 2016 USD ($) ft²
Gaithersburg, Maryland [Member] |
Facility Lease Term | 2030
Rental Square Footage of Building | ft² | 150,000
Tenant Improvement Allowance | $ | $ 9.6
Rockville, Maryland [Member] |
Facility Lease Term | 2020
Uppsala, Sweden [Member] |
Facility Lease Term | 2026

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- Definition It represents the leased leasing arrangements operation leases renewal term of the facility lease during the year. + References No definition available. + Details
Name: | nvax_FacilityLeaseTerm
Namespace Prefix: | nvax_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Rental square footage of building. + References No definition available. + Details
Name: | nvax_RentalSquareFootageOfBuilding
Namespace Prefix: | nvax_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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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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- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=nvax_GaithersburgMarylandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=nvax_RockvilleMarylandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=nvax_UppsalaSwedenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |