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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified | 12 Months Ended | 1 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 Reporting_Unit Customer | Dec. 31, 2013 Customer | Dec. 31, 2012 | Jul. 31, 2012 | Jul. 11, 2012
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cash and investments in marketable securities | $ 262,824,000 nktr_CashRestrictedCashCashEquivalentsAndAvailableForSaleInvestments | $ 262,026,000 nktr_CashRestrictedCashCashEquivalentsAndAvailableForSaleInvestments |  |  |
Indebtedness | 151,800,000 nktr_DebtCapitalLeaseAndOtherLongTermLiabilities |  |  |  |
Senior secured notes, issued | 125,000,000 us-gaap_SeniorLongTermNotes | 125,000,000 us-gaap_SeniorLongTermNotes |  |  |
Restricted cash | 25,000,000 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue |  |  |  |
Maximum maturity term of investments in marketable securities to be considered as cash equivalents | Three months |  |  |  |
Maturity term of investments considered as short-term | Less than one year |  |  |  |
Number of customers accounted for major accounts receivable | 3 nktr_NumberOfCustomersAccountedForMajorAccountsReceivable | 3 nktr_NumberOfCustomersAccountedForMajorAccountsReceivable |  |  |
Percentage of accounts receivable customers one | 40.00%nktr_PercentageOfAccountsReceivableCustomersOne | 30.00%nktr_PercentageOfAccountsReceivableCustomersOne |  |  |
Percentage of accounts receivable customers two | 31.00%nktr_PercentageOfAccountsReceivableCustomersTwo | 28.00%nktr_PercentageOfAccountsReceivableCustomersTwo |  |  |
Percentage of accounts receivable customers three | 15.00%nktr_PercentageOfAccountsReceivableCustomersThree | 28.00%nktr_PercentageOfAccountsReceivableCustomersThree |  |  |
Number of reporting unit evaluated for goodwill | 1 nktr_NumberOfReportingUnitsToEvaluateGoodwillForImpairment |  |  |  |
Reduction of prior periods research and development expenses | 4,700,000 nktr_ResearchAndDevelopmentExpenditureCredits |  |  |  |
Minimum percentage of amount realized upon ultimate settlement | 50.00%nktr_PercentageOfAmountRealizedUponUltimateSettlement |  |  |  |
Stock Options [Member] |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Weighted average diluted securities excluded from diluted net loss per share | 21.9 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember | 20.7 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember | 18.8 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember |  |
Minimum [Member] |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment estimated useful lives | 3 |  |  |  |
Maximum [Member] |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment estimated useful lives | 7 |  |  |  |
12% Senior Secured Notes Due July 2017 [Member] |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Senior secured notes, issued |  |  |  |  | 125,000,000 us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Senior secured notes, interest rate | 12.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  | 12.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Senior secured notes, maturity date | Jul. 15, 2017 |  |  | Jul. 15, 2017 |
Restricted cash | $ 25,000,000 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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