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Subsequent Event (Details) - Subsequent Event - SFJ Pharmaceuticals $ in Millions | Feb. 12, 2021 USD ($)
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Subsequent Event [Line Items] |
Committed funding | $ 150.0
Success-based payments, first indication | $ 450.0
Success-based payments, first indication, period to be paid | 5 years
Success-based payments, second indication | $ 150.0
Success-based payments, second indication, period to be paid | 7 years
Additional indication payment | $ 37.5

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- Definition Collaborative Arrangement, Additional Indication Payment + References No definition available. + Details
Name: | nktr_CollaborativeArrangementAdditionalIndicationPayment
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Collaborative Arrangement, Committed Funding + References No definition available. + Details
Name: | nktr_CollaborativeArrangementCommittedFunding
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Collaborative Arrangement, Success-based Payments, First Indication + References No definition available. + Details
Name: | nktr_CollaborativeArrangementSuccessBasedPaymentsFirstIndication
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Collaborative Arrangement, Success-based Payments, First Indication, Period to be Paid + References No definition available. + Details
Name: | nktr_CollaborativeArrangementSuccessBasedPaymentsFirstIndicationPeriodToBePaid
Namespace Prefix: | nktr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Collaborative Arrangement, Success-based Payments, Second Indication + References No definition available. + Details
Name: | nktr_CollaborativeArrangementSuccessBasedPaymentsSecondIndication
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Collaborative Arrangement, Success-based Payments, Second Indication, Period to be Paid + References No definition available. + Details
Name: | nktr_CollaborativeArrangementSuccessBasedPaymentsSecondIndicationPeriodToBePaid
Namespace Prefix: | nktr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CounterpartyNameAxis=nktr_SFJPharmaceuticalsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |