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Senior Secured Notes - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Jul. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Jul. 11, 2012
Line of Credit Facility [Line Items] |  |  |  |  |
Senior secured notes, issued | $ 125,000,000 us-gaap_SeniorLongTermNotes |  | $ 125,000,000 us-gaap_SeniorLongTermNotes | $ 125,000,000 us-gaap_SeniorLongTermNotes |
Convertible subordinated notes remaining |  |  |  |  | 172,400,000 nktr_ConvertibleSubordinatedNotesRepaid
Maturity date of convertible subordinated notes | Sep. 28, 2012 |  |  |  |
Restricted cash | 25,000,000 us-gaap_RestrictedCashAndCashEquivalents |  | 25,000,000 us-gaap_RestrictedCashAndCashEquivalents | 25,000,000 us-gaap_RestrictedCashAndCashEquivalents | 25,000,000 us-gaap_RestrictedCashAndCashEquivalents
Percentage of repurchase of notes on principal amount of notes | 101.00%nktr_RedemptionPriceAsPercentageOfPrincipalAmountInCaseOfChangeOfControl |  |  |  |
Percentage of repurchase of notes on principal amount of notes | 100.00%nktr_RedemptionPriceAsPercentageOfPrincipalAmountInCaseOfSaleOfAssets |  |  |  |
Convertible Subordinated Notes [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Retirement of convertible subordinated notes |  | 42,500,000 nktr_DebtInstrumentExchangedAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleSubordinatedDebtMember |  |  |
12% Senior Secured Notes Due July 2017 [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Senior secured notes, issued |  |  |  |  | 125,000,000 us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Maturity date of senior secured notes | Jul. 15, 2017 | Jul. 15, 2017 |  |  |
Interest rate | 12.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 12.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 12.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Issuance costs |  | 4,500,000 us-gaap_DebtIssuanceCosts / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |
July 1, 2015 through June 30, 2017 [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Minimum Cash Requirement (Jul 1, 2015 through June 30, 2017) | 25,000,000 nktr_MinimumRequiredCashBalance / us-gaap_DebtInstrumentAxis = nktr_JulyFirstTwoThousandFifteenThroughJuneThirtyTwoThousandSeventeenMember |  | 25,000,000 nktr_MinimumRequiredCashBalance / us-gaap_DebtInstrumentAxis = nktr_JulyFirstTwoThousandFifteenThroughJuneThirtyTwoThousandSeventeenMember |  |
12% Senior Secured Notes Due July 2017 [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maturity date of senior secured notes |  |  | Jul. 15, 2017 |  |
Interest rate | 12.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nktr_TwelvePercentSeniorSecuredNotesDueJulyTwoThousandSeventeenMember |  | 12.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nktr_TwelvePercentSeniorSecuredNotesDueJulyTwoThousandSeventeenMember |  |
Senior Secured Notes carrying amount | $ 125,000,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = nktr_TwelvePercentSeniorSecuredNotesDueJulyTwoThousandSeventeenMember |  | $ 125,000,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = nktr_TwelvePercentSeniorSecuredNotesDueJulyTwoThousandSeventeenMember |  |

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- Definition Convertible subordinated notes maturity date. + References No definition available. + Details
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- Definition Convertible subordinated notes repaid. + References No definition available. + Details
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- Definition Redemption Price As Percentage Of Principal Amount In Case Of Change Of Control + References No definition available. + Details
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- Definition Redemption Price As Percentage Of Principal Amount In Case Of Sale Of Assets + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees). + References No definition available. + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 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 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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