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Long-Term Debt (Notes Payable) (Parenthetical) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Equipment Loan [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Interest Rate During Period 12.10%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_LongtermDebtTypeAxis
= nvax_EquipmentLoanMember
Debt Instrument, Periodic Payment $ 48us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_LongtermDebtTypeAxis
= nvax_EquipmentLoanMember
Loan Agreements [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Interest Rate During Period 3.00%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_LongtermDebtTypeAxis
= nvax_LoanAgreementsMember
Bank Loans [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Periodic Payment $ 22us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_LongtermDebtTypeAxis
= nvax_BankLoansMember
Maximum [Member] | Bank Loans [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Interest Rate During Period 8.50%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_LongtermDebtTypeAxis
= nvax_BankLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Minimum [Member] | Bank Loans [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Interest Rate During Period 7.50%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_LongtermDebtTypeAxis
= nvax_BankLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember