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Liability Related to Sale of Future Royalties - Summary of Liability Related to Potential Future Royalties (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 22 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013
Other Liabilities Disclosure [Abstract] |  |  |
Liability related to sale of future royalties-beginning balance | $ 131,266 |  |
Proceeds from sale of future royalties |  |  | 124,000
Non-cash interest expense recognized | 22,309 |  | 40,366
Non-cash CIMZIA®and MIRCERA®royalty revenue | (22,055) | (10,791) | (32,846)
Payments from Nektar to RPI | (3,000) |  | (3,000)
Total liability related to sale of future royalties as of December 31, 2013 | 128,520 |  | 128,520
Less: current portion | (7,000) | (3,000) | (7,000)
Liability related to sale of future royalties, less current portion | $ 121,520 | $ 128,266 | $ 121,520

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- Definition Liability Related To Sale Of Future Royalties Current And Noncurrent + References No definition available. + Details
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- Definition Liability related to sale of potential future royalties. + References No definition available. + Details
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- Definition Liability Related To Sale Of Potential Future Royalties Current + References No definition available. + Details
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- Definition Liability Related To Sale Of Potential Future Royalties Non Current + References No definition available. + Details
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- Definition Non-cash interest expense on liability from sale of royalties. + References No definition available. + Details
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Namespace Prefix: | nktr_
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- Definition Non cash royalty revenue related to sale future royalties + References No definition available. + Details
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Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Partial Repayment of Royalty Sale Proceeds + References No definition available. + Details
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Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Proceeds from sale of potential future royalties. + References No definition available. + Details
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Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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