XML 45 R35.htm IDEA: XBRL DOCUMENT
v3.21.1

Liability Related to Sale of Future Royalties - Estimates of Annual Interest Rate (Details) | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
2012 Purchase and Sale Agreement |  |
Liability Related to Sale of Future Royalties [Line Items] |  |
Implicit interest rate over the life of the agreement | 20.20% | 19.50%
Prospective effective interest rate | 48.00% | 38.00%
2020 Purchase and Sale Agreement |  |
Liability Related to Sale of Future Royalties [Line Items] |  |
Implicit interest rate over the life of the agreement | 16.00% |
Prospective effective interest rate | 16.00% |

X
- Definition Estimated annual interest rate over life of royalty liability. + References No definition available. + Details
Name: | nktr_EstimatedAnnualInterestRateOverLifeOfRoyaltyLiability
Namespace Prefix: | nktr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Liability related to sale of future royalties. + References No definition available. + Details
Name: | nktr_LiabilityRelatedToSaleOfFutureRoyaltiesLineItems
Namespace Prefix: | nktr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Prospective interest rate percentage. + References No definition available. + Details
Name: | nktr_ProspectiveInterestRatePercentage
Namespace Prefix: | nktr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=nktr_PurchaseAndSaleAgreement2012Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=nktr_PurchaseAndSaleAgreement2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |