XML 44 R34.htm IDEA: XBRL DOCUMENT
v3.19.1

License and Collaboration Agreements - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 13, 2018 | Aug. 23, 2017 | Dec. 31, 2018 | Apr. 30, 2018 | Mar. 31, 2018 | Jan. 31, 2018 | Nov. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Mar. 31, 2016 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2017 | Dec. 31, 2010 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2015
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized in period related to performance in prior periods |  |  |  |  |  |  |  |  |  |  | $ 19,600,000 | $ 28,000,000 |  |  |  |  |
Deferred revenue, current portion |  |  | $ 13,892,000 |  |  |  |  |  |  |  | 11,092,000 |  |  |  |  | $ 13,892,000 |
Deferred revenue, less current portion |  |  | 10,744,000 |  |  |  |  |  |  |  | 9,340,000 |  |  |  |  | 10,744,000 |
Potential future additional development and regulatory milestones |  |  |  |  |  |  |  |  |  |  | 1,700,000,000 |  |  |  |  |  |
Accounts receivable |  |  | 43,213,000 |  |  |  |  |  |  |  | 42,894,000 |  |  |  |  | 43,213,000 |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  |  |  | 28,222,000 | 38,018,000 |  |  |  |  |
Deferred revenue |  |  | 24,636,000 |  |  |  |  |  |  |  | 20,432,000 |  |  |  |  | 24,636,000 |
NKTR-358 [Member] | Nektar's [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue |  |  |  |  |  |  |  |  |  |  | $ 5,800,000 |  |  |  |  |  |
BMS Collaboration Agreement [Member] | NKTR-214 [Member] | Nektar's [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront and milestone payments received from license agreements |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Global commercialization profits and losses sharing percentage | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of sharing production costs | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BMS Collaboration Agreement [Member] | NKTR-214 [Member] | Nektar's [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum total additional cash payments receivable upon achievement of certain development and regulatory milestones |  |  |  | 1,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Eligible additional cash payments receivable upon achievement of certain sales milestones |  |  |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
BMS Collaboration Agreement [Member] | NKTR-214 [Member] | Nektar's [Member] | Opdivo [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of sharing development costs | 32.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BMS Collaboration Agreement [Member] | NKTR-214 [Member] | Nektar's [Member] | Opdivo and Yervoy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of sharing development costs | 22.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NKTR-358 [Member] | Nektar's [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Received upfront and milestone payment |  |  |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |
Percentage of sharing in Phase 2 development costs |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory milestones payment, description |  |  |  |  |  |  |  |  |  |  | A portion of the development milestones may be reduced by 50% under certain conditions, related to the final formulation of the approved product and the timing of prior approval (if any) of competitive products with a similar mechanism of action, which could reduce these milestone payments by 75% if both conditions occur. |  |  |  |  |  |
AstraZeneca-Kirin [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of upfront payment, market access milestones, royalties and sales milestones |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |
Baxalta Incorporated/Takeda [Member] | Hemophilia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Received under right to sublicense agreement |  |  |  |  |  |  | $ 12,000,000 |  |  |  |  |  |  |  |  |  |
Baxalta Incorporated/Takeda [Member] | Hemophilia [Member] | Annual Sales Level Milestone [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Baxalta Incorporated/Takeda [Member] | Hemophilia [Member] | European Union [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront and milestone payments received from license agreements |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  | 10,000,000 |  |  |  |  |
Bristol-Myers Squibb [Member] | Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  | 8,284,600 |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock consideration received |  |  |  | $ 850,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Bristol-Myers Squibb [Member] | NKTR-214 [Member] | Research and Development Expense [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reimbursement of expenses |  |  |  |  |  |  |  |  |  |  | $ 28,800,000 | $ 2,300,000 |  |  |  |  |
Bristol-Myers Squibb [Member] | BMS Collaboration Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  |  |  |  | 28,400,000 |  |  |  |  |  |
Bristol-Myers Squibb [Member] | BMS Collaboration Agreement [Member] | Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration received under agreements |  |  |  | 1,850,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of shares |  |  |  | $ 790,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Closing date price of common stock |  |  |  | $ 99.36 |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining amount allocated to transaction price |  |  |  | $ 1,059,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Potential future development, regulatory and sales milestones |  |  |  | $ 1,800,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Bristol-Myers Squibb [Member] | BMS Collaboration Agreement [Member] | NKTR-214 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Global commercialization profits and losses sharing percentage | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of sharing production costs | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount recognized for granting licenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,059,800,000 |
Bristol-Myers Squibb [Member] | BMS Collaboration Agreement [Member] | NKTR-214 [Member] | Opdivo [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of sharing development costs | 67.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bristol-Myers Squibb [Member] | BMS Collaboration Agreement [Member] | NKTR-214 [Member] | Opdivo and Yervoy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of sharing development costs | 78.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bristol-Myers Squibb [Member] | Clinical Trial Agreement [Member] | NKTR-214 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of out-of-pocket costs to be reimbursed by partner |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |
Eli Lilly and Company [Member] | NKTR-358 License [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction price allocated to performance obligation |  |  |  |  |  |  |  | 125,900,000 |  |  |  |  |  |  |  |  |
Eli Lilly and Company [Member] | NKTR-358 [Member] | ASC 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  |  |  |  |  | $ 125,900,000 |  | $ 125,900,000 |  |
Eli Lilly and Company [Member] | NKTR-358 [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential future additional development and regulatory milestones |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eli Lilly and Company [Member] | NKTR-358 [Member] | Nektar's [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of regulatory milestones payments will be reduced under certain conditions |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of regulatory milestones payments will be reduced if conditions occur |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eli Lilly and Company [Member] | NKTR-358 [Member] | Nektar's [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of funding phase 3 development costs on an indication by indication basis borne |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eli Lilly and Company [Member] | NKTR-358 [Member] | Nektar's [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of funding phase 3 development costs on an indication by indication basis borne |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eli Lilly and Company [Member] | Phase 1 Clinical Development [Member] | NKTR-358 License [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction price allocated to performance obligation |  |  |  |  |  |  |  | 17,600,000 |  |  |  |  |  |  |  |  |
Eli Lilly and Company [Member] | Drug Product Development [Member] | NKTR-358 License [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction price allocated to performance obligation |  |  |  |  |  |  |  | $ 6,500,000 |  |  |  |  |  |  |  |  |
Eli Lilly [Member] | NKTR-358 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of sharing in Phase 2 development costs |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amgen, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Received upfront and milestone payment |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |
Amgen, Inc. [Member] | ASC 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue |  |  |  |  |  |  |  |  |  |  | 7,900,000 |  |  |  |  |  |
AstraZeneca AB [Member] | MOVANTIK and MOVENTIG [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Received upfront and milestone payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 385,000,000
AstraZeneca AB [Member] | AstraZeneca-Kirin [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Percentage of upfront payment, market access milestone payments, royalties and sales milestone payments from sublicense agreement retained by our collaboration partner |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  |  |
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |  |
Potential future additional payments for development milestones |  |  |  |  |  |  |  |  |  |  | $ 45,500,000 |  |  |  |  |  |

X
- Definition Aggregate consideration received from agreements. + References No definition available. + Details
Name: | nktr_AggregateConsiderationReceivedFromAgreements
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of transaction price allocated to performance obligation. + References No definition available. + Details
Name: | nktr_AmountOfTransactionPriceAllocatedToPerformanceObligation
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount recognized for granting licenses. + References No definition available. + Details
Name: | nktr_AmountRecognizedForGrantingLicenses
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Collaborative arrangements maximum aggregate additional cash payments receivable upon achievement of development and regulatory milestones. + References No definition available. + Details
Name: | nktr_CollaborativeArrangementsMaximumAggregateAdditionalCashPaymentsReceivableUponAchievementOfDevelopmentAndRegulatoryMilestones
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Eligible additional cash payments receivable upon achievement of certain sales milestones. + References No definition available. + Details
Name: | nktr_EligibleAdditionalCashPaymentsReceivableUponAchievementOfCertainSalesMilestones
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Estimated fair value of shares. + References No definition available. + Details
Name: | nktr_EstimatedFairValueOfShares
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Payments received under rights to sublicense agreement. + References No definition available. + Details
Name: | nktr_PaymentsReceivedUnderRightsToSublicenseAgreement
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of development milestones payments, to be received, if conditions occur. + References No definition available. + Details
Name: | nktr_PercentageOfDevelopmentMilestonesPaymentsToBeReceivedIfConditionsOccur
Namespace Prefix: | nktr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of development milestones payments, to be received under certain conditions. + References No definition available. + Details
Name: | nktr_PercentageOfDevelopmentMilestonesPaymentsToBeReceivedUnderCertainConditions
Namespace Prefix: | nktr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of funding Phase three development costs on an indication by indication basis borne. + References No definition available. + Details
Name: | nktr_PercentageOfFundingPhaseThreeDevelopmentCostsOnAnIndicationByIndicationBasisBorne
Namespace Prefix: | nktr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of out of pocket costs to be reimbursed by partner. + References No definition available. + Details
Name: | nktr_PercentageOfOutOfPocketCostsToBeReimbursedByPartner
Namespace Prefix: | nktr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of sharing in development costs. + References No definition available. + Details
Name: | nktr_PercentageOfSharingInDevelopmentCosts
Namespace Prefix: | nktr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of sharing in Phase 2 development costs. + References No definition available. + Details
Name: | nktr_PercentageOfSharingInPhaseTwoDevelopmentCosts
Namespace Prefix: | nktr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of sharing in production costs. + References No definition available. + Details
Name: | nktr_PercentageOfSharingInProductionCosts
Namespace Prefix: | nktr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of upfront payment, market access milestone payments, royalties and sales milestone payments. + References No definition available. + Details
Name: | nktr_PercentageOfUpfrontPaymentMarketAccessMilestonePaymentsRoyaltiesAndSalesMilestonePayments
Namespace Prefix: | nktr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of upfront payment market access milestone payments royalties and sales milestone payments from sublicense agreement retained by our collaboration partner. + References No definition available. + Details
Name: | nktr_PercentageOfUpfrontPaymentMarketAccessMilestonePaymentsRoyaltiesAndSalesMilestonePaymentsFromSublicenseAgreementRetainedByOurCollaborationPartner
Namespace Prefix: | nktr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Potential development and regulatory milestones. + References No definition available. + Details
Name: | nktr_PotentialDevelopmentAndRegulatoryMilestones
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Potential development milestones. + References No definition available. + Details
Name: | nktr_PotentialDevelopmentMilestones
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Potential development regulatory and sales milestones. + References No definition available. + Details
Name: | nktr_PotentialDevelopmentRegulatoryAndSalesMilestones
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Profits and losses sharing percentage. + References No definition available. + Details
Name: | nktr_ProfitsAndLossesSharingPercentage
Namespace Prefix: | nktr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Regulatory milestones payment description. + References No definition available. + Details
Name: | nktr_RegulatoryMilestonesPaymentDescription
Namespace Prefix: | nktr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reimbursement of expenses. + References No definition available. + Details
Name: | nktr_ReimbursementOfExpenses
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Remaining amount allocated to transaction price. + References No definition available. + Details
Name: | nktr_RemainingAmountAllocatedToTransactionPrice
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Sale of stock consideration received. + References No definition available. + Details
Name: | nktr_SaleOfStockConsiderationReceived
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Upfront and milestone payments received from license agreements. + References No definition available. + Details
Name: | nktr_UpfrontAndMilestonePaymentsReceivedFromLicenseAgreements
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Upfront and milestone payments received under license agreement. + References No definition available. + Details
Name: | nktr_UpfrontAndMilestonePaymentsReceivedUnderLicenseAgreement
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AccountsReceivableNetCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130532-203044 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 + Details
Name: | us-gaap_ContractWithCustomerLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130532-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 + Details
Name: | us-gaap_ContractWithCustomerLiabilityCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130532-203044 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 + Details
Name: | us-gaap_ContractWithCustomerLiabilityNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12A -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL108322424-203045 + Details
Name: | us-gaap_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
Name: | us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
Name: | us-gaap_SharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_ProductOrServiceAxis=nktr_NektarThreeFiveEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=srt_ParentCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_ProductOrServiceAxis=nktr_NektarTwoOneFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis=nktr_OpdivoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis=nktr_OpdivoAndYervoyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | dei_LegalEntityAxis=nktr_BaxaltaIncorporatedOrTakedaPLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_ContractWithCustomerSalesChannelAxis=nktr_AnnualSalesLevelMilestoneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=us-gaap_EuropeanUnionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=nktr_BristolMyersSquibbCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=nktr_SharePurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_ResearchAndDevelopmentExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | dei_LegalEntityAxis=nktr_EliLillyAndCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=nktr_NektarThreeFiveEightLicenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201409Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | dei_LegalEntityAxis=nktr_EliLillyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=nktr_AmgenIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=nktr_AstraZenecaAbMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | dei_LegalEntityAxis=nktr_OtherPartnerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |