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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Statement of Financial Position [Abstract] |  |
Allowance for accounts receivable | $ 0 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 0 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred stock, par value | $ 0.0001 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.0001 us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized | 10,000 us-gaap_PreferredStockSharesAuthorized | 10,000 us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares designated | 0 nktr_PreferredStockShareDesignated | 0 nktr_PreferredStockShareDesignated
Preferred stock, shares issued | 0 us-gaap_PreferredStockSharesIssued | 0 us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding | 0 us-gaap_PreferredStockSharesOutstanding | 0 us-gaap_PreferredStockSharesOutstanding
Common stock, par value | $ 0.0001 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.0001 us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized | 300,000 us-gaap_CommonStockSharesAuthorized | 300,000 us-gaap_CommonStockSharesAuthorized
Common stock, shares issued | 131,216 us-gaap_CommonStockSharesIssued | 116,494 us-gaap_CommonStockSharesIssued
Common stock, shares outstanding | 131,216 us-gaap_CommonStockSharesOutstanding | 116,494 us-gaap_CommonStockSharesOutstanding

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