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v2.4.1.9

Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Deferred tax assets: |  |
Net operating loss carryforwards | $ 423,776 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | $ 391,385 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Research and other credits | 66,666 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch | 61,707 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Deferred revenue | 29,758 us-gaap_DeferredTaxAssetsDeferredIncome | 35,588 us-gaap_DeferredTaxAssetsDeferredIncome
Stock-based compensation | 21,948 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 25,962 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Sale of future royalties | 20,153 nktr_DeferredTaxAssetsFromSaleOfFutureRoyalties | 28,057 nktr_DeferredTaxAssetsFromSaleOfFutureRoyalties
Capitalized research expenses | 14,795 nktr_DeferredTaxAssetsCapitalizedResearchExpenses | 17,687 nktr_DeferredTaxAssetsCapitalizedResearchExpenses
Reserves and accruals | 8,288 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | 14,685 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Property, plant and equipment | 8,264 nktr_DeferredTaxAssetsDepreciationPropertyAndEquipment | 8,580 nktr_DeferredTaxAssetsDepreciationPropertyAndEquipment
Other | 2,218 us-gaap_DeferredTaxAssetsOther | 2,539 us-gaap_DeferredTaxAssetsOther
Deferred tax assets before valuation allowance | 595,866 us-gaap_DeferredTaxAssetsGross | 586,190 us-gaap_DeferredTaxAssetsGross
Valuation allowance for deferred tax assets | (595,690)us-gaap_DeferredTaxAssetsValuationAllowance | (586,040)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets | 176 us-gaap_DeferredTaxAssetsNet | 150 us-gaap_DeferredTaxAssetsNet
Total deferred tax liabilities | 0 us-gaap_DeferredTaxLiabilities | 0 us-gaap_DeferredTaxLiabilities
Net deferred tax assets | $ 176 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 150 us-gaap_DeferredTaxAssetsLiabilitiesNet

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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