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Employee Benefits (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Maximum contribution percentage of compensation | 100.00% |  |
Employer match percentage | 50.00% |  |
Percentage of employee deferral eligible for employer matching contribution | 6.00% |  |
Contributions to employee benefits plan | $ 0.8 | $ 0.5 | $ 0.4
Contributions and other expenses related to foreign subsidiary | $ 0.5 | $ 0.4 | $ 0.2

X
- Definition The amount of the cost recognized during the period for defined contribution plans and other expenses. + References No definition available. + Details
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Namespace Prefix: | nvax_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the percentage of the participant's deferral that is eligible for an employer matching contribution. + References No definition available. + Details
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Namespace Prefix: | nvax_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration