XML 65 R51.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Stockholders' Equity - Summarization of Common Stock Shares for Issuance Under Existing Equity Compensation Plans (Detail) shares in Thousands | Dec. 31, 2015 $ / shares shares
--- | ---
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Securities to be Issued Upon Exercise of Outstanding Options & Vesting of RSUs | 20,088
Weighted-Average Exercise Price of Outstanding Options | $ / shares | $ 11.22
Number of Securities Remaining Available for Issuance Under Equity Compensation Plans (Excluding Securities Reflected in Column) | 7,657
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 & Vesting of RSUs | 18,056
Weighted-Average Exercise Price of Outstanding Options | $ / shares | $ 11.33
Number of Securities Remaining Available for Issuance Under Equity Compensation Plans (Excluding Securities Reflected in Column) | 7,657
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 & Vesting of RSUs | 2,032
Weighted-Average Exercise Price of Outstanding Options | $ / shares | $ 10.30
Number of Securities Remaining Available for Issuance Under Equity Compensation Plans (Excluding Securities Reflected in Column) | 0

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
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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

X
- Details
Name: | us-gaap_AwardTypeAxis=nktr_EquityCompensationPlansApprovedByShareholdersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=nktr_EquityCompensationPlansUnapprovedBySecurityHoldersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |