$NKTR
NEKTAR THERAPEUTICS Stock $nktr

$nktr Overview Financials Valuation SEC Filings Company Website

2020 Q1 Form 10-K Financial Statement

#000090670920000004 Filed on February 28, 2020

Income Statement

Concept	2020 Q1	2019	2018 Q4
Revenue	$50.57M	$114.6M	$39.83M
YoY Change	79.2%	-90.4%	-58.28%
Cost Of Revenue	$3.811M	$21.37M	$7.461M
YoY Change	-29.94%	-12.44%	-23.5%
Gross Profit	$46.76M	$93.24M	$32.37M
YoY Change	105.26%	-92.02%	-62.24%
Gross Profit Margin	92.46%	81.35%	81.27%
Selling, General & Admin	$26.20M	$98.70M	$23.80M
YoY Change	4.8%	21.25%	93.5%
% of Gross Profit	56.03%	105.85%	73.54%
Research & Development	$109.0M	$434.6M	$108.9M
YoY Change	-8.0%	8.77%	33.72%
% of Gross Profit	233.07%	466.06%	336.42%
Depreciation & Amortization	$4.500M	$11.00M	$3.100M
YoY Change	45.16%	25.0%	19.23%
% of Gross Profit	9.62%	11.8%	9.58%
Operating Expenses	$109.0M	$434.6M	$108.9M
YoY Change	-8.0%	8.77%	33.72%
Operating Profit	-$133.6M	-$440.0M	-$100.3M
YoY Change	10.73%	-163.96%	317.3%
Interest Expense	$6.204M	$21.31M	$200.0K
YoY Change	18.71%	-1.26%	-102.08%
% of Operating Profit
Other Income/Expense, Net	-$4.820M	-$19.00K
YoY Change	-504.36%	-99.64%
Pretax Income	-$138.5M	-$440.1M	-$100.1M
YoY Change	15.86%	-164.46%	197.92%
Income Tax	$200.0K	$613.0K	-$1.900M
% Of Pretax Income
Net Earnings	-$138.7M	-$440.7M	-$98.21M
YoY Change	15.9%	-164.68%	190.34%
Net Earnings / Revenue	-274.16%	-384.47%	-246.6%
Basic Earnings Per Share	-$0.78	-$2.52	-$0.57
Diluted Earnings Per Share	-$0.78	-$2.52	-$0.57
COMMON SHARES
Basic Shares Outstanding	177.6M shares	175.0M shares	173.1M
Diluted Shares Outstanding		175.0M shares

Balance Sheet

Concept	2020 Q1	2019	2018 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.346B	$1.325B	$1.335B
YoY Change	-3.08%	-0.79%	350.93%
Cash & Equivalents	$227.0M	$96.40M	$194.9M
Short-Term Investments	$1.119B	$1.229B	$1.140B
Other Short-Term Assets	$13.81M	$47.20M	$21.29M
YoY Change	-70.49%	-1.26%	173.23%
Inventory	$14.32M	$12.70M	$11.38M
Prepaid Expenses
Receivables	$42.03M	$36.80M	$43.21M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$1.429B	$1.422B	$1.438B
YoY Change	-4.08%	-1.12%	339.9%
LONG-TERM ASSETS
Property, Plant & Equipment	$62.31M	$199.2M	$48.85M
YoY Change	-56.0%	307.36%	2.92%
Goodwill	$76.50M		$76.50M
YoY Change			0.0%
Intangibles
YoY Change
Long-Term Investments	$185.9M	$279.1M	$582.9M
YoY Change	-59.22%	-52.12%	920.84%
Other Assets		$1.000M	$4.244M
YoY Change		-76.19%	326.96%
Total Long-Term Assets	$458.6M	$555.8M	$712.5M
YoY Change	-32.2%	-21.99%	291.38%
TOTAL ASSETS
Total Short-Term Assets	$1.429B	$1.422B	$1.438B
Total Long-Term Assets	$458.6M	$555.8M	$712.5M
Total Assets	$1.888B	$1.977B	$2.150B
YoY Change	-12.86%	-8.04%	322.54%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$21.79M	$19.20M	$5.854M
YoY Change	98.08%	225.42%	22.42%
Accrued Expenses	$97.10M	$79.50M	$61.80M
YoY Change	25.13%	28.64%	93.13%
Deferred Revenue	$3.007M		$13.89M
YoY Change	-72.89%		-26.69%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$254.1M	$248.7M
YoY Change
Total Short-Term Liabilities	$377.5M	$353.9M	$82.00M
YoY Change	278.61%	331.59%	46.01%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$0.00	$247.0M
YoY Change	-100.0%	-100.0%	0.73%
Other Long-Term Liabilities	$214.0M	$218.1M	$9.990M
YoY Change	15.12%	110.52%	66.72%
Total Long-Term Liabilities	$214.0M	$218.1M	$9.990M
YoY Change	-50.61%	-37.79%	66.72%
TOTAL LIABILITIES
Total Short-Term Liabilities	$377.5M	$353.9M	$82.00M
Total Long-Term Liabilities	$214.0M	$218.1M	$9.990M
Total Liabilities	$591.5M	$572.0M	$432.6M
YoY Change	10.98%	32.22%	2.75%
SHAREHOLDERS EQUITY
Retained Earnings	-$2.003B		-$1.424B
YoY Change			-32.76%
Common Stock	$3.307B		$3.148B
YoY Change			42.58%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.296B	$1.405B	$1.718B
YoY Change
Total Liabilities & Shareholders Equity	$1.888B	$1.977B	$2.150B
YoY Change	-12.86%	-8.04%	322.54%

Cashflow Statement

Concept	2020 Q1	2019	2018 Q4
OPERATING ACTIVITIES
Net Income	-$138.7M	-$440.7M	-$98.21M
YoY Change	15.9%	-164.68%	190.34%
Depreciation, Depletion And Amortization	$4.500M	$11.00M	$3.100M
YoY Change	45.16%	25.0%	19.23%
Cash From Operating Activities	-$78.08M	-$328.7M	-$117.6M
YoY Change	-3.49%	-145.76%	46.27%
INVESTING ACTIVITIES
Capital Expenditures	$900.0K	$26.29M	-$8.600M
YoY Change	-84.07%	84.6%	258.33%
Acquisitions
YoY Change
Other Investing Activities	$198.7M	$233.2M	$96.20M
YoY Change	-3156.92%	-117.08%	278.74%
Cash From Investing Activities	$197.8M	$206.9M	$87.60M
YoY Change	-1729.32%	-114.99%	280.87%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$11.08M	$23.36M	2.700M
YoY Change	126.34%	-97.26%	-88.89%
NET CHANGE
Cash From Operating Activities	-$78.08M	-$328.7M	-117.6M
Cash From Investing Activities	$197.8M	$206.9M	87.60M
Cash From Financing Activities	$11.08M	$23.36M	2.700M
Net Change In Cash	$130.7M	-$98.54M	-27.30M
YoY Change	-248.23%	-151.83%	-17.52%
FREE CASH FLOW
Cash From Operating Activities	-$78.08M	-$328.7M	-$117.6M
Capital Expenditures	$900.0K	$26.29M	-$8.600M
Free Cash Flow	-$78.98M	-$355.0M	-$109.0M
YoY Change	-8.74%	-150.42%	39.74%

Facts In Submission

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CY2019	nktr	Collaboration Agreements Completion Date CollaborationAgreementsCompletionDate	2017-12-31
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CY2019	dei	Entity Registrant Name EntityRegistrantName	NEKTAR THERAPEUTICS
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	94-3134940
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	455 Mission Bay Boulevard South
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CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
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CY2019	dei	Security12b Title Security12bTitle	Common Stock, $0.0001 par value
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CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-440054000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	682725000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-96076000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	613000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1412000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	616000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-440667000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	681313000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	-96692000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-2.52
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.02
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.62
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-2.52
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.78
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.62
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	174993000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	169600000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	155953000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	174993000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	180119000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	155953000	shares
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-440667000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	681313000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	-96692000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	5693000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-2975000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-533000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-382000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-1230000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	785000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	5311000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-4205000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	252000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-435356000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	677108000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-96440000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	88125000	USD
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	59528000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	36615000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	252000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	-96692000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	87828000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	61729000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	88101000	USD
CY2018	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	8285000	shares
CY2018	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	790232000	USD
CY2018Q1	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	12577000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-4205000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	681313000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	1717575000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	23377000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	99795000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	5311000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-440667000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	1405391000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	-440667000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	681313000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	-96692000	USD
CY2019	nktr	Non Cash Royalty Revenue Related To Sale Of Future Royalties NonCashRoyaltyRevenueRelatedToSaleOfFutureRoyalties	36303000	USD
CY2018	nktr	Non Cash Royalty Revenue Related To Sale Of Future Royalties NonCashRoyaltyRevenueRelatedToSaleOfFutureRoyalties	33308000	USD
CY2017	nktr	Non Cash Royalty Revenue Related To Sale Of Future Royalties NonCashRoyaltyRevenueRelatedToSaleOfFutureRoyalties	30531000	USD
CY2019	nktr	Non Cash Interest Expense Related To Sale Of Royalties NonCashInterestExpenseRelatedToSaleOfRoyalties	25044000	USD
CY2018	nktr	Non Cash Interest Expense Related To Sale Of Royalties NonCashInterestExpenseRelatedToSaleOfRoyalties	21196000	USD
CY2017	nktr	Non Cash Interest Expense Related To Sale Of Royalties NonCashInterestExpenseRelatedToSaleOfRoyalties	18869000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	99795000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	88101000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	36615000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	13156000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	10870000	USD
CY2017	us-gaap	Depreciation And Amortization DepreciationAndAmortization	14741000	USD
CY2019	nktr	Impairment Of Equipment From Terminated Program ImpairmentOfEquipmentFromTerminatedProgram	0	USD
CY2018	nktr	Impairment Of Equipment From Terminated Program ImpairmentOfEquipmentFromTerminatedProgram	0	USD
CY2017	nktr	Impairment Of Equipment From Terminated Program ImpairmentOfEquipmentFromTerminatedProgram	15081000	USD
CY2019	nktr	Accretion Of Discount Net And Other Non Cash Transactions AccretionOfDiscountNetAndOtherNonCashTransactions	11394000	USD
CY2018	nktr	Accretion Of Discount Net And Other Non Cash Transactions AccretionOfDiscountNetAndOtherNonCashTransactions	10952000	USD
CY2017	nktr	Accretion Of Discount Net And Other Non Cash Transactions AccretionOfDiscountNetAndOtherNonCashTransactions	881000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-6411000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	25505000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-10664000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	1284000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	655000	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-383000	USD
CY2019	nktr	Increase Decrease In Operating Lease Right Of Use Assets Net Of Operating Lease Liabilities IncreaseDecreaseInOperatingLeaseRightOfUseAssetsNetOfOperatingLeaseLiabilities	-13090000	USD
CY2018	nktr	Increase Decrease In Operating Lease Right Of Use Assets Net Of Operating Lease Liabilities IncreaseDecreaseInOperatingLeaseRightOfUseAssetsNetOfOperatingLeaseLiabilities	0	USD
CY2017	nktr	Increase Decrease In Operating Lease Right Of Use Assets Net Of Operating Lease Liabilities IncreaseDecreaseInOperatingLeaseRightOfUseAssetsNetOfOperatingLeaseLiabilities	0	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-1190000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	31652000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	4800000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	12967000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	971000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	2074000	USD
CY2019	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	1530000	USD
CY2018	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	1674000	USD
CY2017	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-10017000	USD
CY2019	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	3816000	USD
CY2018	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	27947000	USD
CY2017	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	7277000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-16565000	USD
CY2018	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-15331000	USD
CY2017	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-28269000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	533000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	3545000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-14928000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-328681000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	718214000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-80414000	USD
CY2019	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1380865000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	2271250000	USD
CY2017	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	404425000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1614036000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	890957000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	347743000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	11963000	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	37549000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	26285000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	14239000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	9676000	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	0	USD
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	2633000	USD
CY2017	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	0	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	206886000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1379936000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-28809000	USD
CY2019	nktr	Proceeds From Issuance Of Common Stock Net Of Issuance Costs ProceedsFromIssuanceOfCommonStockNetOfIssuanceCosts	0	USD
CY2018	nktr	Proceeds From Issuance Of Common Stock Net Of Issuance Costs ProceedsFromIssuanceOfCommonStockNetOfIssuanceCosts	790231000	USD
CY2017	nktr	Proceeds From Issuance Of Common Stock Net Of Issuance Costs ProceedsFromIssuanceOfCommonStockNetOfIssuanceCosts	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans	23355000	USD
CY2018	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans	61735000	USD
CY2017	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans	59522000	USD
CY2019	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	0	USD
CY2018	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	0	USD
CY2017	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	5131000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	23355000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	851966000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	54391000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-102000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-101000	USD
CY2017	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-46000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-98542000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	190143000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-54878000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	194905000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	4762000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	59640000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	96363000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	194905000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	4762000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	19199000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	19471000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	20116000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	555000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	618000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	556000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	57691000	USD
CY2018	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
CY2017	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities Noncurrent AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	582889000	USD
CY2019Q4	nktr	Cash Restricted Cash Cash Equivalents And Available For Sale Investments CashRestrictedCashCashEquivalentsAndAvailableForSaleInvestments	1603981000	USD
CY2019Q4	nktr	Cash Restricted Cash Cash Equivalents And Available For Sale Investments CashRestrictedCashCashEquivalentsAndAvailableForSaleInvestments	1600000000	USD
CY2019Q4	us-gaap	Senior Notes SeniorNotes	250000000.0	USD
CY2019	us-gaap	Contract With Customer Asset Reclassified To Receivable ContractWithCustomerAssetReclassifiedToReceivable	12800000	USD
CY2019	nktr	Net Expense Reimbursements From Collaboration Partner NetExpenseReimbursementsFromCollaborationPartner	24000000.0	USD
CY2018	us-gaap	Contract With Customer Asset Reclassified To Receivable ContractWithCustomerAssetReclassifiedToReceivable	24200000	USD
CY2018	nktr	Net Expense Reimbursements From Collaboration Partner NetExpenseReimbursementsFromCollaborationPartner	19000000.0	USD
CY2019Q4	nktr	Number Of Customers Accounted For Major Accounts Receivable NumberOfCustomersAccountedForMajorAccountsReceivable	3
CY2019	nktr	Percentage Of Accounts Receivable Customers One PercentageOfAccountsReceivableCustomersOne	0.65
CY2019	nktr	Percentage Of Accounts Receivable Customers Two PercentageOfAccountsReceivableCustomersTwo	0.17
CY2019	nktr	Percentage Of Accounts Receivable Customers Three PercentageOfAccountsReceivableCustomersThree	0.14
CY2018Q4	nktr	Number Of Customers Accounted For Major Accounts Receivable NumberOfCustomersAccountedForMajorAccountsReceivable	3
CY2018	nktr	Percentage Of Accounts Receivable Customers One PercentageOfAccountsReceivableCustomersOne	0.44
CY2018	nktr	Percentage Of Accounts Receivable Customers Two PercentageOfAccountsReceivableCustomersTwo	0.36
CY2018	nktr	Percentage Of Accounts Receivable Customers Three PercentageOfAccountsReceivableCustomersThree	0.12
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	1140445000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities Noncurrent AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	279119000	USD
CY2019	nktr	Number Of Reporting Units To Evaluate Goodwill For Impairment NumberOfReportingUnitsToEvaluateGoodwillForImpairment	1
CY2019	nktr	Customer Payment Period From Receipt Of Invoice CustomerPaymentPeriodFromReceiptOfInvoice	P30D
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	10500000	shares
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	1300000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	96363000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	194905000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	1228499000	USD
CY2018Q4	nktr	Cash Restricted Cash Cash Equivalents And Available For Sale Investments CashRestrictedCashCashEquivalentsAndAvailableForSaleInvestments	1918239000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	12000000.0	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	37500000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1507655000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1800011000	USD
CY2019Q4	nktr	Cash And Restricted Cash CashAndRestrictedCash	5829000	USD
CY2018Q4	nktr	Cash And Restricted Cash CashAndRestrictedCash	5812000	USD
CY2019Q4	nktr	Cash Restricted Cash Cash Equivalents And Available For Sale Investments CashRestrictedCashCashEquivalentsAndAvailableForSaleInvestments	1603981000	USD
CY2018Q4	nktr	Cash Restricted Cash Cash Equivalents And Available For Sale Investments CashRestrictedCashCashEquivalentsAndAvailableForSaleInvestments	1918239000	USD
CY2019Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	6800000	USD
CY2018Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	6600000	USD
CY2019Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	1673000	USD
CY2018Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	1846000	USD
CY2019Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	8267000	USD
CY2018Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	6403000	USD
CY2019Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	2725000	USD
CY2018Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	3132000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	12665000	USD
CY2018Q4	us-gaap	Inventory Net InventoryNet	11381000	USD
CY2019Q4	nktr	Depreciable Property Plant And Equipment Gross DepreciablePropertyPlantAndEquipmentGross	188322000	USD
CY2018Q4	nktr	Depreciable Property Plant And Equipment Gross DepreciablePropertyPlantAndEquipmentGross	164270000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	127875000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	120507000	USD
CY2019Q4	nktr	Depreciable Property Plant And Equipment Net DepreciablePropertyPlantAndEquipmentNet	60447000	USD
CY2018Q4	nktr	Depreciable Property Plant And Equipment Net DepreciablePropertyPlantAndEquipmentNet	43763000	USD
CY2019Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	4552000	USD
CY2018Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	5088000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	64999000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	48851000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	11000000.0	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	8800000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	12600000	USD
CY2017Q4	nktr	Costs Related To Terminated Manufacturing Obligations CostsRelatedToTerminatedManufacturingObligations	900000	USD
CY2019	nktr	Actual Days Outstanding ActualDaysOutstanding	P360D
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	14697000	USD
CY2018	us-gaap	Operating Lease Cost OperatingLeaseCost	7972000	USD
CY2017	us-gaap	Operating Lease Cost OperatingLeaseCost	4515000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	6408000	USD
CY2018	us-gaap	Variable Lease Cost VariableLeaseCost	4497000	USD
CY2017	us-gaap	Variable Lease Cost VariableLeaseCost	3077000	USD
CY2019	us-gaap	Lease Cost LeaseCost	21105000	USD
CY2018	us-gaap	Lease Cost LeaseCost	12469000	USD
CY2017	us-gaap	Lease Cost LeaseCost	7592000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	14700000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	8400000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	14571000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	19219000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	19832000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	20461000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	21110000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	118058000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	213251000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	54741000	USD
CY2019Q4	nktr	Lessee Operating Lease Liability Tenant Improvement Reimbursements LesseeOperatingLeaseLiabilityTenantImprovementReimbursements	3264000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	155246000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	12516000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	142730000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P10Y1M6D
CY2019Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.059
CY2018Q4	us-gaap	Deferred Rent Credit Noncurrent DeferredRentCreditNoncurrent	9300000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	7914000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	10617000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	13649000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	14117000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	14599000	USD
CY2019Q4	nktr	Operating Leases Future Minimum Payments Due In Six Years And Thereafter OperatingLeasesFutureMinimumPaymentsDueInSixYearsAndThereafter	98315000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	159211000	USD
CY2018Q4	nktr	Liability Related To Sale Of Potential Future Royalties Non Current LiabilityRelatedToSaleOfPotentialFutureRoyaltiesNonCurrent	84810000	USD
CY2012Q1	nktr	Liability Related To Sale Of Potential Future Royalties Non Current LiabilityRelatedToSaleOfPotentialFutureRoyaltiesNonCurrent	0	USD
CY2019	nktr	Proceeds From Sale Of Potential Future Royalties ProceedsFromSaleOfPotentialFutureRoyalties	0	USD
	nktr	Proceeds From Sale Of Potential Future Royalties ProceedsFromSaleOfPotentialFutureRoyalties	124000000	USD
CY2019	nktr	Partial Repayment Of Royalty Sale Proceeds PartialRepaymentOfRoyaltySaleProceeds	0	USD
	nktr	Partial Repayment Of Royalty Sale Proceeds PartialRepaymentOfRoyaltySaleProceeds	10000000	USD
CY2019	nktr	Non Cash Royalty Revenue Related To Sale Of Future Royalties NonCashRoyaltyRevenueRelatedToSaleOfFutureRoyalties	36303000	USD
	nktr	Non Cash Royalty Revenue Related To Sale Of Future Royalties NonCashRoyaltyRevenueRelatedToSaleOfFutureRoyalties	207142000	USD
CY2019	nktr	Non Cash Interest Expense Related To Sale Of Royalties NonCashInterestExpenseRelatedToSaleOfRoyalties	25044000	USD
	nktr	Non Cash Interest Expense Related To Sale Of Royalties NonCashInterestExpenseRelatedToSaleOfRoyalties	166693000	USD
CY2019Q4	nktr	Liability Related To Sale Of Potential Future Royalties Non Current LiabilityRelatedToSaleOfPotentialFutureRoyaltiesNonCurrent	73551000	USD
CY2019Q4	nktr	Liability Related To Sale Of Potential Future Royalties Non Current LiabilityRelatedToSaleOfPotentialFutureRoyaltiesNonCurrent	73551000	USD
CY2019Q4	nktr	Liabilities On Sale Of Future Royalties Unamortized Transaction Costs LiabilitiesOnSaleOfFutureRoyaltiesUnamortizedTransactionCosts	1531000	USD
CY2019Q4	nktr	Liabilities On Sale Of Future Royalties Unamortized Transaction Costs LiabilitiesOnSaleOfFutureRoyaltiesUnamortizedTransactionCosts	1531000	USD
CY2019Q4	nktr	Liability Related To Sale Of Potential Future Royalties Non Current Net Of Issuance Costs LiabilityRelatedToSaleOfPotentialFutureRoyaltiesNonCurrentNetOfIssuanceCosts	72020000	USD
CY2019Q4	nktr	Liability Related To Sale Of Potential Future Royalties Non Current Net Of Issuance Costs LiabilityRelatedToSaleOfPotentialFutureRoyaltiesNonCurrentNetOfIssuanceCosts	72020000	USD
CY2019	nktr	Non Cash Royalty Revenue Related To Sale Of Future Royalties NonCashRoyaltyRevenueRelatedToSaleOfFutureRoyalties	36300000	USD
CY2018	nktr	Non Cash Royalty Revenue Related To Sale Of Future Royalties NonCashRoyaltyRevenueRelatedToSaleOfFutureRoyalties	33300000	USD
CY2017	nktr	Non Cash Royalty Revenue Related To Sale Of Future Royalties NonCashRoyaltyRevenueRelatedToSaleOfFutureRoyalties	30500000	USD
CY2019	nktr	Non Cash Interest Expense Related To Sale Of Royalties NonCashInterestExpenseRelatedToSaleOfRoyalties	25000000.0	USD
CY2018	nktr	Non Cash Interest Expense Related To Sale Of Royalties NonCashInterestExpenseRelatedToSaleOfRoyalties	21200000	USD
CY2017	nktr	Non Cash Interest Expense Related To Sale Of Royalties NonCashInterestExpenseRelatedToSaleOfRoyalties	18900000	USD
	nktr	Estimated Annual Interest Rate Over Life Of Royalty Liability EstimatedAnnualInterestRateOverLifeOfRoyaltyLiability	0.17
CY2017Q4	nktr	Estimated Annual Interest Rate Over Life Of Royalty Liability EstimatedAnnualInterestRateOverLifeOfRoyaltyLiability	0.176
CY2017Q4	nktr	Prospective Interest Rate Percentage ProspectiveInterestRatePercentage	0.21
CY2018Q4	nktr	Estimated Annual Interest Rate Over Life Of Royalty Liability EstimatedAnnualInterestRateOverLifeOfRoyaltyLiability	0.187
CY2018Q4	nktr	Prospective Interest Rate Percentage ProspectiveInterestRatePercentage	0.29
CY2019Q4	nktr	Estimated Annual Interest Rate Over Life Of Royalty Liability EstimatedAnnualInterestRateOverLifeOfRoyaltyLiability	0.195
CY2019Q4	nktr	Prospective Interest Rate Percentage ProspectiveInterestRatePercentage	0.38
CY2019Q4	us-gaap	Purchase Commitment Remaining Minimum Amount Committed PurchaseCommitmentRemainingMinimumAmountCommitted	25800000	USD
CY2019Q4	nktr	Share Based Compensation Arrangement By Share Based Payment Award Options And Restricted Stock Units Outstanding ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndRestrictedStockUnitsOutstanding	19817000	shares
CY2019Q4	nktr	Number Of Securities Available For Issuance Under Equity Compensation Plans NumberOfSecuritiesAvailableForIssuanceUnderEquityCompensationPlans	9145000	shares
CY2019	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.60
CY2019	us-gaap	Deferred Compensation Arrangement With Individual Contributions By Employer DeferredCompensationArrangementWithIndividualContributionsByEmployer	6000	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	3500000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2800000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1600000	USD
CY2019	nktr	License Collaboration Other Revenue LicenseCollaborationOtherRevenue	16975000	USD
CY2018	nktr	License Collaboration Other Revenue LicenseCollaborationOtherRevenue	1097265000	USD
CY2017	nktr	License Collaboration Other Revenue LicenseCollaborationOtherRevenue	210965000	USD
CY2019	us-gaap	Contract With Customer Performance Obligation Satisfied In Previous Period ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod	77500000	USD
CY2018	us-gaap	Contract With Customer Performance Obligation Satisfied In Previous Period ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod	95300000	USD
CY2018Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	24636000	USD
CY2019	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	16565000	USD
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	8071000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	5500000	USD
CY2019Q4	nktr	Potential Development Milestones PotentialDevelopmentMilestones	1700000000	USD
CY2019	nktr	Upfront And Milestone Payments Received From License Agreements UpfrontAndMilestonePaymentsReceivedFromLicenseAgreements	10000000.0	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	99795000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	88101000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	36615000	USD
CY2019Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	213700000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.018
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.028
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.020
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.000
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.000
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.000
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate	0.622
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate	0.610
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate	0.542
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y7M6D
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y1M6D
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y3M18D
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	12.25
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	29.86
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	20.08
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	30600000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	303400000	USD
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	84000000.0	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-441494000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	680423000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-97938000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	1440000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	2302000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	1862000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-440054000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	682725000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-96076000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	139000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	699000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	495000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	620000	USD
CY2017	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	580000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	634000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1319000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	581000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	0	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	0	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	0	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-21000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	93000	USD
CY2017	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	35000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-21000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	93000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	35000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	613000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1412000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	616000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-92411000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	143372000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-33627000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	10511000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	17295000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	8038000	USD
CY2019	nktr	Incometax Reconciliation Income Tax Sale Of Future Royalties IncometaxReconciliationIncomeTaxSaleOfFutureRoyalties	-7624000	USD
CY2018	nktr	Incometax Reconciliation Income Tax Sale Of Future Royalties IncometaxReconciliationIncomeTaxSaleOfFutureRoyalties	-6995000	USD
CY2017	nktr	Incometax Reconciliation Income Tax Sale Of Future Royalties IncometaxReconciliationIncomeTaxSaleOfFutureRoyalties	-8236000	USD
CY2019	nktr	Income Tax Reconciliation Expense Share Based Compensation Cost IncomeTaxReconciliationExpenseShareBasedCompensationCost	-672000	USD
CY2018	nktr	Income Tax Reconciliation Expense Share Based Compensation Cost IncomeTaxReconciliationExpenseShareBasedCompensationCost	-66716000	USD
CY2017	nktr	Income Tax Reconciliation Expense Share Based Compensation Cost IncomeTaxReconciliationExpenseShareBasedCompensationCost	-20665000	USD
CY2019	nktr	Income Tax Reconciliation Premium On Equity Issuance IncomeTaxReconciliationPremiumOnEquityIssuance	0	USD
CY2018	nktr	Income Tax Reconciliation Premium On Equity Issuance IncomeTaxReconciliationPremiumOnEquityIssuance	12551000	USD
CY2017	nktr	Income Tax Reconciliation Premium On Equity Issuance IncomeTaxReconciliationPremiumOnEquityIssuance	0	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	104440000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-46885000	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-186124000	USD
CY2019	nktr	Income Tax Reconciliation Non Deductible Expense For Liability Related Sale Of Future Royalties IncomeTaxReconciliationNonDeductibleExpenseForLiabilityRelatedSaleOfFutureRoyalties	5259000	USD
CY2018	nktr	Income Tax Reconciliation Non Deductible Expense For Liability Related Sale Of Future Royalties IncomeTaxReconciliationNonDeductibleExpenseForLiabilityRelatedSaleOfFutureRoyalties	4451000	USD
CY2017	nktr	Income Tax Reconciliation Non Deductible Expense For Liability Related Sale Of Future Royalties IncomeTaxReconciliationNonDeductibleExpenseForLiabilityRelatedSaleOfFutureRoyalties	6604000	USD
CY2019	nktr	Income Tax Reconciliation Nondeductible Expense Officers Compensation IncomeTaxReconciliationNondeductibleExpenseOfficersCompensation	737000	USD
CY2018	nktr	Income Tax Reconciliation Nondeductible Expense Officers Compensation IncomeTaxReconciliationNondeductibleExpenseOfficersCompensation	3182000	USD
CY2017	nktr	Income Tax Reconciliation Nondeductible Expense Officers Compensation IncomeTaxReconciliationNondeductibleExpenseOfficersCompensation	2547000	USD
CY2019	nktr	Change In Tax Rate Income Tax Expense Benefit ChangeInTaxRateIncomeTaxExpenseBenefit	23000	USD
CY2018	nktr	Change In Tax Rate Income Tax Expense Benefit ChangeInTaxRateIncomeTaxExpenseBenefit	45000	USD
CY2017	nktr	Change In Tax Rate Income Tax Expense Benefit ChangeInTaxRateIncomeTaxExpenseBenefit	248155000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1372000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	804000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	0	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	613000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1412000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	616000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	399361000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	300693000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Research DeferredTaxAssetsTaxCreditCarryforwardsResearch	128015000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Research DeferredTaxAssetsTaxCreditCarryforwardsResearch	116955000	USD
CY2019Q4	nktr	Deferred Tax Assets Lease Liability DeferredTaxAssetsLeaseLiability	36907000	USD
CY2018Q4	nktr	Deferred Tax Assets Lease Liability DeferredTaxAssetsLeaseLiability	0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	30875000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	21518000	USD
CY2019Q4	nktr	Deferred Tax Assets Depreciation Property And Equipment DeferredTaxAssetsDepreciationPropertyAndEquipment	5021000	USD
CY2018Q4	nktr	Deferred Tax Assets Depreciation Property And Equipment DeferredTaxAssetsDepreciationPropertyAndEquipment	2124000	USD
CY2019Q4	nktr	Deferred Tax Assets Capitalized Research Expenses DeferredTaxAssetsCapitalizedResearchExpenses	3705000	USD
CY2018Q4	nktr	Deferred Tax Assets Capitalized Research Expenses DeferredTaxAssetsCapitalizedResearchExpenses	8072000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	2934000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	8066000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	1908000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	4467000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	608726000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	461895000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	575087000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	460455000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	33639000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	1440000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	31718000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	0	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1725000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1270000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	33443000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1270000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	196000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	170000	USD
CY2019	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	114600000	USD
CY2018	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-35700000	USD
CY2017	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-169300000	USD
CY2019	nktr	Valuation Allowance Related To Stock Based Compensation And Exercises ValuationAllowanceRelatedToStockBasedCompensationAndExercises	-35600000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	0	USD
CY2019	nktr	Federal Orphan Drug Credits FederalOrphanDrugCredits	17700000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	27419000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	20483000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	18413000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	144000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	802000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	77410000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	27419000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	20483000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	0	USD
CY2019	nktr	Number Of Operating Business Segment NumberOfOperatingBusinessSegment	1
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	114617000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1193323000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	307711000	USD
CY2019Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	28222000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	23315000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	29218000	USD
CY2019Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	33862000	USD
CY2018Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	38018000	USD
CY2018Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1087717000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	27762000	USD
CY2018Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	39826000	USD
CY2019Q1	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	5440000	USD
CY2019Q2	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	5018000	USD
CY2019Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	4927000	USD
CY2019Q4	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	5989000	USD
CY2018Q1	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	6646000	USD
CY2018Q2	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	5522000	USD
CY2018Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	4783000	USD
CY2018Q4	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	7461000	USD
CY2019Q1	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	118463000	USD
CY2019Q2	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	106686000	USD
CY2019Q3	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	99048000	USD
CY2019Q4	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	110369000	USD
CY2018Q1	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	99424000	USD
CY2018Q2	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	88334000	USD
CY2018Q3	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	102895000	USD
CY2018Q4	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	108883000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	-120687000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-110970000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	-98740000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	-109638000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	-86739000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	973600000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	-98634000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	-100295000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	-119632000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	-110286000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	-98585000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	-112164000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	-95792000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	971460000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	-96143000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	-98212000	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.69
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.63
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.56
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.64
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.60
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.67
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.56
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.57
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.69
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.63
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.56
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.64
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.60
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.33
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.56
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.57

Files In Submission

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$NKTR
NEKTAR THERAPEUTICS Stock $nktr

2020 Q1 Form 10-K Financial Statement

#000090670920000004 Filed on February 28, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NKTR NEKTAR THERAPEUTICS Stock $nktr

2020 Q1 Form 10-K Financial Statement

#000090670920000004 Filed on February 28, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NKTR
NEKTAR THERAPEUTICS Stock $nktr