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Property, Plant and Equipment - Property, Plant and Equipment (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Property, Plant and Equipment [Line Items] |  |
Depreciable property and equipment at cost | $ 147,866 nktr_DepreciablePropertyPlantAndEquipmentGross | $ 144,861 nktr_DepreciablePropertyPlantAndEquipmentGross
Less: accumulated depreciation | (93,807)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (84,148)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Depreciable property, plant and equipment, net | 54,059 nktr_DepreciablePropertyPlantAndEquipmentNet | 60,713 nktr_DepreciablePropertyPlantAndEquipmentNet
Construction-in-progress | 16,309 us-gaap_ConstructionInProgressGross | 6,261 us-gaap_ConstructionInProgressGross
Property plant and equipment, net | 70,368 us-gaap_PropertyPlantAndEquipmentNet | 66,974 us-gaap_PropertyPlantAndEquipmentNet
Building and Leasehold Improvements [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Depreciable property and equipment at cost | 72,228 nktr_DepreciablePropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = nktr_BuildingAndLeaseholdImprovementsMember | 71,306 nktr_DepreciablePropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = nktr_BuildingAndLeaseholdImprovementsMember
Laboratory Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Depreciable property and equipment at cost | 26,975 nktr_DepreciablePropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = nktr_LaboratoryEquipmentMember | 26,621 nktr_DepreciablePropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = nktr_LaboratoryEquipmentMember
Manufacturing Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Depreciable property and equipment at cost | 25,212 nktr_DepreciablePropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ManufacturingFacilityMember | 23,699 nktr_DepreciablePropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ManufacturingFacilityMember
Furniture, Fixtures and Other Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Depreciable property and equipment at cost | $ 23,451 nktr_DepreciablePropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember | $ 23,235 nktr_DepreciablePropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember

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- Definition Depreciable Property, plant and equipment, Gross. + References No definition available. + Details
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- Definition Depreciable Property, plant and equipment, Net. + References No definition available. + Details
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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -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 210.5-02.14) -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 14 -Article 5 + Details
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- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Details
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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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