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Commitments and Contingencies - Additional Information (Detail) - USD ($) | Jun. 30, 2016 | Dec. 31, 2015 | Aug. 14, 2015
--- | --- | --- | ---
Loss Contingencies [Line Items] |  |  |
Damage claim for alleged unpaid licenses |  |  | $ 1,500,000
Indemnification Obligation [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Indemnification obligations, liabilities | $ 0 | $ 0 |

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- Definition Damage claim for alleged unpaid licensing fee. + References No definition available. + Details
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Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
Name: | us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_IndemnificationGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |