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Liability Related to Sale of Future Royalties - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 1 Months Ended | 0 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 | Feb. 24, 2012 | Dec. 31, 2013 | Dec. 31, 2012
Liability Related to Sale of Future Royalties [Line Items] |  |  |  |  |  |
Royalty agreement contingent payment description | As a result of worldwide net sales of MIRCERA for the 12 month periods ended on December 31, 2013 and 2012 not reaching certain minimum thresholds. |  |  |  |  |
Annual interest rate | 17.00%nktr_EstimatedAnnualInterestRateOnRoyaltyLiability |  |  |  |  |
Milestone Scenario One [Member] |  |  |  |  |  |
Liability Related to Sale of Future Royalties [Line Items] |  |  |  |  |  |
Payment made for milestone not achieved year one |  | $ 3.0 nktr_PaymentMadeForMilestoneNotAchievedYearOne / us-gaap_ContingentConsiderationByTypeAxis = nktr_MilestoneScenarioOneMember |  |  |  |
Milestone Scenario Two [Member] |  |  |  |  |  |
Liability Related to Sale of Future Royalties [Line Items] |  |  |  |  |  |
Payment made for milestone not achieved year two |  |  | 7.0 nktr_PaymentMadeForMilestoneNotAchievedYearTwo / us-gaap_ContingentConsiderationByTypeAxis = nktr_MilestoneScenarioTwoMember |  |  |
Purchase and Sale Agreement with RPI [Member] |  |  |  |  |  |
Liability Related to Sale of Future Royalties [Line Items] |  |  |  |  |  |
Proceeds from sale of royalty rights |  |  |  | 124.0 nktr_ProceedsFromSaleOfPotentialFutureRoyaltiesGross / us-gaap_TypeOfArrangementAxis = nktr_PurchaseAndSaleAgreementMember |  |
Transaction costs related to sale of potential future royalties |  |  |  | 4.4 nktr_TransactionCostsRelatedToSaleOfPotentialFutureRoyalties / us-gaap_TypeOfArrangementAxis = nktr_PurchaseAndSaleAgreementMember |  |
CIMZIA and MIRCERA [Member] |  |  |  |  |  |
Liability Related to Sale of Future Royalties [Line Items] |  |  |  |  |  |
Non-cash royalties from net sales | 21.9 nktr_RoyaltyRevenueAndNoncashRoyaltyRevenueFromCimziaAndMircera / us-gaap_TypeOfArrangementAxis = nktr_CimziaAndMirceraMember |  |  |  | $ 22.1 nktr_RoyaltyRevenueAndNoncashRoyaltyRevenueFromCimziaAndMircera / us-gaap_TypeOfArrangementAxis = nktr_CimziaAndMirceraMember | $ 10.8 nktr_RoyaltyRevenueAndNoncashRoyaltyRevenueFromCimziaAndMircera / us-gaap_TypeOfArrangementAxis = nktr_CimziaAndMirceraMember

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- Definition Estimated Annual Interest Rate On Royalty Liability + References No definition available. + Details
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Namespace Prefix: | nktr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | nktr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Payment Made For Milestone Not Achieved Year One + References No definition available. + Details
Name: | nktr_PaymentMadeForMilestoneNotAchievedYearOne
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Payment Made For Milestone Not Achieved Year Two + References No definition available. + Details
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Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Proceeds from sale of potential future royalties gross. + References No definition available. + Details
Name: | nktr_ProceedsFromSaleOfPotentialFutureRoyaltiesGross
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Royalty agreement contingent payment description. + References No definition available. + Details
Name: | nktr_RoyaltyAgreementContingentPaymentDescription
Namespace Prefix: | nktr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Royalty Revenue And Non-cash Royalty Revenue From Cimzia And Mircera + References No definition available. + Details
Name: | nktr_RoyaltyRevenueAndNoncashRoyaltyRevenueFromCimziaAndMircera
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Transaction costs related to sale of potential future royalties. + References No definition available. + Details
Name: | nktr_TransactionCostsRelatedToSaleOfPotentialFutureRoyalties
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_ContingentConsiderationByTypeAxis=nktr_MilestoneScenarioOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ContingentConsiderationByTypeAxis=nktr_MilestoneScenarioTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TypeOfArrangementAxis=nktr_CimziaAndMirceraMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TypeOfArrangementAxis=nktr_PurchaseAndSaleAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |