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Segment Reporting - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Sales Information [Line Items] |  |  |
Number of operating business segment | 1 nktr_NumberOfOperatingBusinessSegment |  |
Number of components within business segment | 2 nktr_NumberOfComponentsWithinBusinessSegment |  |
Property and equipment, net | 70,368 us-gaap_PropertyPlantAndEquipmentNet | 66,974 us-gaap_PropertyPlantAndEquipmentNet |
United States [Member] |  |  |
Sales Information [Line Items] |  |  |
Property and equipment, net | 63,700 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US | 57,300 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US |
Percentage of net book value of property and equipment | 90.00%nktr_PercentageOfPropertyPlantEquipmentNetInAssets / us-gaap_StatementGeographicalAxis = country_US | 88.00%nktr_PercentageOfPropertyPlantEquipmentNetInAssets / us-gaap_StatementGeographicalAxis = country_US |
India [Member] |  |  |
Sales Information [Line Items] |  |  |
Property and equipment, net | 6,700 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_IN | 7,700 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_IN |
Percentage of net book value of property and equipment | 10.00%nktr_PercentageOfPropertyPlantEquipmentNetInAssets / us-gaap_StatementGeographicalAxis = country_IN | 12.00%nktr_PercentageOfPropertyPlantEquipmentNetInAssets / us-gaap_StatementGeographicalAxis = country_IN |
Revenue [Member] | AstraZeneca [Member] |  |  |
Sales Information [Line Items] |  |  |
Percentage revenue from clients | 52.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_MajorCustomersAxis = nktr_AstraZenecaMember | 17.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_MajorCustomersAxis = nktr_AstraZenecaMember |
Revenue [Member] | UCB [Member] |  |  |
Sales Information [Line Items] |  |  |
Percentage revenue from clients | 16.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_MajorCustomersAxis = nktr_UcbPharmaMember | 21.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_MajorCustomersAxis = nktr_UcbPharmaMember | 30.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_MajorCustomersAxis = nktr_UcbPharmaMember
Revenue [Member] | Roche [Member] |  |  |
Sales Information [Line Items] |  |  |
Percentage revenue from clients | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_MajorCustomersAxis = nktr_RocheMember | 28.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_MajorCustomersAxis = nktr_RocheMember | 23.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_MajorCustomersAxis = nktr_RocheMember
Revenue [Member] | Bayer [Member] |  |  |
Sales Information [Line Items] |  |  |
Percentage revenue from clients |  | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_MajorCustomersAxis = nktr_BayerMember |
Revenue [Member] | Affymax, Inc. [Member] |  |  |
Sales Information [Line Items] |  |  |
Percentage revenue from clients |  |  | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_MajorCustomersAxis = nktr_AffymaxIncMember

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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