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Income Taxes (Deferred Tax Assets (Liabilities)) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Net operating losses U.S. $ 148,451us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic $ 123,907us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
Net operating losses foreign 6,535us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign 6,405us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign
Research tax credits 11,068us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 9,175us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Other 9,963us-gaap_DeferredTaxAssetsOther 6,844us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 176,017us-gaap_DeferredTaxAssetsGross 146,331us-gaap_DeferredTaxAssetsGross
Intangibles (2,773)us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets (3,573)us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Other (321)us-gaap_DeferredTaxLiabilitiesOther (227)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (3,094)us-gaap_DeferredIncomeTaxLiabilities (3,800)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax assets 172,923nvax_DeferredTaxAssetsLiabilitiesGross 142,531nvax_DeferredTaxAssetsLiabilitiesGross
Less valuation allowance (172,923)us-gaap_DeferredTaxAssetsValuationAllowance (142,531)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets, net $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet