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Stockholders' Equity - Summarization of Common Stock Shares for Issuance Under Existing Equity Compensation Plans (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | Dec. 31, 2014
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Securities to be Issued Upon Exercise of Outstanding Options | 21,995 nktr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndRestrictedStockUnitsOutstanding
Number of Securities Remaining Available for Issuance Under Equity Compensation Plans (Excluding Securities Reflected in Column) | 2,812 nktr_NumberOfSecuritiesAvailableForIssuanceUnderEquityCompensationPlans
Weighted-Average Exercise Price of Outstanding Options | $ 10.50 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
Equity Compensation Plans Approved by Security Holders [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Securities to be Issued Upon Exercise of Outstanding Options | 18,601 nktr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndRestrictedStockUnitsOutstanding / us-gaap_AwardTypeAxis = nktr_EquityCompensationPlansApprovedByShareholdersMember
Number of Securities Remaining Available for Issuance Under Equity Compensation Plans (Excluding Securities Reflected in Column) | 2,812 nktr_NumberOfSecuritiesAvailableForIssuanceUnderEquityCompensationPlans / us-gaap_AwardTypeAxis = nktr_EquityCompensationPlansApprovedByShareholdersMember
Weighted-Average Exercise Price of Outstanding Options | $ 10.68 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_AwardTypeAxis = nktr_EquityCompensationPlansApprovedByShareholdersMember
Equity Compensation Plans Not Approved by Security Holders [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Securities to be Issued Upon Exercise of Outstanding Options | 3,394 nktr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndRestrictedStockUnitsOutstanding / us-gaap_AwardTypeAxis = nktr_EquityCompensationPlansUnapprovedBySecurityHoldersMember
Weighted-Average Exercise Price of Outstanding Options | $ 9.52 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_AwardTypeAxis = nktr_EquityCompensationPlansUnapprovedBySecurityHoldersMember

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- Definition Number of securities remaining available for issuance under equity compensation plans. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award options and restricted stock units outstanding. + References No definition available. + Details
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- Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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