XML 18 R54.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Stockholders' Equity - Summarization of Common Stock Shares for Issuance Under Existing Equity Compensation Plans (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | Dec. 31, 2013
--- | ---
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Securities to be Issued Upon Exercise of Outstanding Options | 20,655
Number of Securities Remaining Available for Issuance Under Equity Compensation Plans (Excluding Securities Reflected in Column) | 7,954
Weighted-Average Exercise Price of Outstanding Options | $ 9.06
Equity Compensation Plans Approved by Security Holders [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Securities to be Issued Upon Exercise of Outstanding Options | 14,936
Number of Securities Remaining Available for Issuance Under Equity Compensation Plans (Excluding Securities Reflected in Column) | 7,954
Weighted-Average Exercise Price of Outstanding Options | $ 8.76
Equity Compensation Plans Not Approved by Security Holders [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Securities to be Issued Upon Exercise of Outstanding Options | 5,719
Number of Securities Remaining Available for Issuance Under Equity Compensation Plans (Excluding Securities Reflected in Column) |
Weighted-Average Exercise Price of Outstanding Options | $ 9.84

X
- Definition Number of securities remaining available for issuance under equity compensation plans. + References No definition available. + Details
Name: | nktr_NumberOfSecuritiesAvailableForIssuanceUnderEquityCompensationPlans
Namespace Prefix: | nktr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Share based compensation arrangement by share based payment award options and restricted stock units outstanding. + References No definition available. + Details
Name: | nktr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndRestrictedStockUnitsOutstanding
Namespace Prefix: | nktr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant