Entity Central Index Key Cover [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Well Known Seasoned Issuer Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Entity Public Float Entity Public Float Entity Interactive Data Current Entity Interactive Data Current Title of 12(b) Security Security12b Title Security Exchange Name Security Exchange Name Entity File Number Entity File Number Entity Incorporation, State or Country Code Entity Incorporation State Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address Address Line1 Entity Address, Address Line Two Entity Address Address Line2 Entity Address, City or Town Entity Address City Or Town Entity Address, State or Province Entity Address State Or Province Entity Address, Postal Zip Code Entity Address Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Document Annual Report Document Annual Report Document Transition Report Document Transition Report Documents Incorporated by Reference Documents Incorporated By Reference [Text Block] Statement Of Financial Position [Abstract] ASSETS Assets [Abstract] CURRENT ASSETS Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Accounts receivable Accounts Receivable Net Current Prepaid expenses Prepaid Expense Current Other current assets Other Assets Current Short-term investments Held To Maturity Securities Current TOTAL CURRENT ASSETS Assets Current Property and equipment, net Property Plant And Equipment Net Intangible assets, net Finite Lived Intangible Assets Net Long-term investments Held To Maturity Securities Noncurrent Other assets Other Assets Noncurrent TOTAL ASSETS Assets LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities And Stockholders Equity [Abstract] CURRENT LIABILITIES Liabilities Current [Abstract] Accounts payable Accounts Payable Current Accrued expenses Accrued Liabilities Current Accrued payroll and benefits Employee Related Liabilities Current Deferred rent Deferred Rent Credit Current Deferred revenue Contract With Customer Liability Current Note payable Notes Payable Current Other current liabilities Other Liabilities Current TOTAL CURRENT LIABILITIES Liabilities Current LONG-TERM LIABILITIES Liabilities Noncurrent [Abstract] Deferred rent, net of current portion Deferred Rent Credit Noncurrent Deferred revenue, net of current portion Contract With Customer Liability Noncurrent Note payable, net of current portion Long Term Notes Payable Other non-current liabilities Other Liabilities Noncurrent TOTAL LONG-TERM LIABILITIES Liabilities Noncurrent Commitments and contingencies (Note 7) Commitments And Contingencies STOCKHOLDERS’ EQUITY Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract] Arrowhead Pharmaceuticals, Inc. stockholders' equity: Stockholders Equity [Abstract] Common stock, $0.001 par value; 145,000,000 shares authorized; 95,506,271 and 88,505,302 shares issued and outstanding as of September 30, 2019 and September 30, 2018, respectively Common Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income Loss Net Of Tax Accumulated deficit Retained Earnings Accumulated Deficit Total Arrowhead Pharmaceuticals, Inc. stockholders' equity Stockholders Equity Noncontrolling interest Minority Interest TOTAL STOCKHOLDERS’ EQUITY Stockholders Equity Including Portion Attributable To Noncontrolling Interest TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities And Stockholders Equity Common stock, par value Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Common stock, shares outstanding Common Stock Shares Outstanding Income Statement [Abstract] REVENUE Revenue From Contract With Customer Excluding Assessed Tax Type of Revenue [Extensible List] Type Of Revenue Extensible List OPERATING EXPENSES Operating Expenses [Abstract] Research and development Research And Development Expense Excluding Acquired In Process Cost General and administrative expenses General And Administrative Expense TOTAL OPERATING EXPENSES Operating Expenses OPERATING INCOME (LOSS) Operating Income Loss OTHER INCOME (EXPENSE) Nonoperating Income Expense [Abstract] Interest income (expense), net Interest Income Expense Nonoperating Net Change in value of derivatives Unrealized Gain Loss On Derivatives Other income (expense) Other Nonoperating Income Expense TOTAL OTHER INCOME (EXPENSE) Nonoperating Income Expense INCOME (LOSS) BEFORE INCOME TAXES Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Provision for income taxes Income Tax Expense Benefit NET INCOME (LOSS) Net Income Loss NET INCOME (LOSS) PER SHARE - BASIC Earnings Per Share Basic NET INCOME (LOSS) PER SHARE - DILUTED Earnings Per Share Diluted Weighted average shares outstanding - basic Weighted Average Number Of Shares Outstanding Basic Weighted average shares outstanding - diluted Weighted Average Number Of Diluted Shares Outstanding OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX: Comprehensive Income Net Of Tax [Abstract] Foreign Currency Translation Adjustments Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax COMPREHENSIVE INCOME (LOSS) Comprehensive Income Net Of Tax Exchange rights exercised during period value. Exchange rights exercised during period shares. Value of stock issued during the period upon the exercise of warrants. Shares of stock issued during the period upon the exercise of warrants. Statement Of Stockholders Equity [Abstract] Statement [Table] Statement [Table] Common Stock Statement Equity Components [Axis] Equity Component Equity Component [Domain] Preferred Stock Preferred Stock [Member] Common Stock Common Stock [Member] Additional Paid-In Capital Additional Paid In Capital [Member] Accumulated Other Comprehensive Income (loss) Accumulated Other Comprehensive Income [Member] Accumulated Deficit Retained Earnings [Member] Non-controlling Interest Noncontrolling Interest [Member] Legal Entity Legal Entity [Axis] Entity Entity [Domain] Amgen Incorporated. Amgen Amgen Incorporated [Member] Statement [Line Items] Statement [Line Items] Beginning Balance, Amount Beginning Balance, Shares Shares Outstanding Stock-based compensation Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Exercise of stock options, Amount Stock Issued During Period Value Stock Options Exercised Exercise of stock options, Shares Stock Issued During Period Shares Stock Options Exercised Exercise of warrants, Amount Stock Issued During Period Value Exercise Of Warrants Exercise of warrants, Shares Stock Issued During Period Shares Exercise Of Warrants Common stock- Restricted Stock Units vesting, Amount Stock Issued During Period Value Restricted Stock Award Gross Common stock- Restricted Stock Units vesting, Shares Stock Issued During Period Shares Restricted Stock Award Gross Common stock issued Stock Issued During Period Value New Issues Common stock issued, Shares Stock Issued During Period Shares New Issues Preferred stock converted to common stock, Amount Stock Issued During Period Value Conversion Of Convertible Securities Preferred stock converted to common stock, Shares Stock Issued During Period Shares Conversion Of Convertible Securities Exercise of exchange rights, Amount Exchange Rights Exercised During Period Value Exercise of exchange rights, Shares Exchange Rights Exercised During Period Shares Foreign currency translation adjustments Net income (loss) Profit Loss Ending Balance, Amount Ending Balance, Shares Stock issued, price per share Shares Issued Price Per Share Proceeds from exercises of warrants and stock options. The amount of cash received during the period for refundable income tax credits. Statement Of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided By Used In Operating Activities [Abstract] Change in value of derivatives Stock-based compensation Share Based Compensation Depreciation and amortization Depreciation And Amortization Amortization/(accretion) of note premiums Investment Income Net Amortization Of Discount And Premium Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Accounts receivable Increase Decrease In Accounts Receivable Prepaid expenses and other current assets Increase Decrease In Prepaid Deferred Expense And Other Assets Deferred revenue Increase Decrease In Contract With Customer Liability Accounts payable Increase Decrease In Accounts Payable Accrued expenses Increase Decrease In Accrued Liabilities Other Increase Decrease In Other Operating Liabilities NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES Net Cash Provided By Used In Operating Activities CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided By Used In Investing Activities [Abstract] Purchases of property and equipment Payments To Acquire Property Plant And Equipment Purchases of marketable securities Payments To Acquire Marketable Securities Proceeds from sale of marketable securities Proceeds From Sale And Maturity Of Marketable Securities NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES Net Cash Provided By Used In Investing Activities CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided By Used In Financing Activities [Abstract] Principal payments on notes payable Repayments Of Notes Payable Payments of taxes for net share settled restricted stock unit issuances Payments Related To Tax Withholding For Share Based Compensation Proceeds from the exercises of warrants and stock options Proceeds From Exercises Of Warrants And Stock Options Proceeds from the issuance of common stock Proceeds From Issuance Of Common Stock NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES Net Cash Provided By Used In Financing Activities NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CASH AND CASH EQUIVALENTS AT END OF PERIOD Supplementary disclosures: Supplemental Cash Flow Information [Abstract] Interest Paid Interest Paid Net Income Tax Credits Refunded Proceeds From Refundable Income Tax Credits Income Tax Paid Income Taxes Paid Accounting Policies [Abstract] Organization and Significant Accounting Policies Organization Consolidation And Presentation Of Financial Statements Disclosure And Significant Accounting Policies [Text Block] Collaboration and license agreements. Collaboration And License Agreements [Abstract] Collaboration and License Agreements Collaborative Arrangement Disclosure [Text Block] Property Plant And Equipment [Abstract] Property and Equipment Property Plant And Equipment Disclosure [Text Block] Held To Maturity Securities Classified [Abstract] Investments Cost And Equity Method Investments Disclosure [Text Block] Goodwill And Intangible Assets Disclosure [Abstract] Intangible Assets Intangible Assets Disclosure [Text Block] Equity [Abstract] Stockholders' Equity Stockholders Equity Note Disclosure [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Stock-Based Compensation Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Compensation And Retirement Disclosure [Abstract] Employee Benefit Plans Compensation And Employee Benefit Plans [Text Block] Quarterly Financial Information Disclosure [Abstract] Unaudited Quarterly Financial Data Quarterly Financial Information [Text Block] Principles of Consolidation Consolidation Policy [Text Block] Basis of presentation and use of estimates. Basis of Presentation and Use of Estimates Basis Of Presentation And Use Of Estimates Policy [Text Block] Cash and Cash Equivalents Cash And Cash Equivalents Restricted Cash And Cash Equivalents Policy Concentration of Credit Risk Concentration Risk Credit Risk Investments Investment Policy [Text Block] Property and Equipment Property Plant And Equipment Policy [Text Block] Intangible Assets subject to amortization Goodwill And Intangible Assets Policy [Text Block] Disclosure of accounting policy for contingent consideration obligations related to acquisitions. Contingent Consideration Contingent Consideration Policy [Text Block] Revenue Recognition Revenue From Contract With Customer Policy [Text Block] Allowance for Doubtful Accounts Trade And Other Accounts Receivable Policy Research and Development Research And Development Expense Policy Net Income (Loss) per Share Earnings Per Share Policy [Text Block] Stock-Based Compensation Share Based Compensation Option And Incentive Plans Policy Income Taxes Income Tax Policy [Text Block] Recent Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] Summary of Property and Equipment Property Plant And Equipment [Text Block] Summary of Short-term and Long-term Investments Held To Maturity Securities [Text Block] Schedule of Intangible Assets Schedule Of Intangible Assets And Goodwill Table [Text Block] Future Minimum Lease Payments Under Operating Leases Schedule Of Future Minimum Rental Payments For Operating Leases Table [Text Block] Summarized Information about Stock Options Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Assumptions Used to Value Stock Options Schedule Of Share Based Payment Award Stock Options Valuation Assumptions Table [Text Block] Summary of Share Activity Related to RSUs Schedule Of Share Based Compensation Restricted Stock Units Award Activity Table [Text Block] Fair Value Measurements for Assets and Liabilities Measured at Fair Value on Recurring Basis Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis Table [Text Block] Components of the Net Deferred Tax (Liability) Schedule Of Deferred Tax Assets And Liabilities Table [Text Block] Provisions for Income Taxes Schedule Of Components Of Income Tax Expense Benefit Table [Text Block] Summary of Effective Income Tax Rate Reconciliation Schedule Of Effective Income Tax Rate Reconciliation Table [Text Block] Schedule of Unaudited Quarterly Financial Data Schedule Of Quarterly Financial Information Table [Text Block] Cash received as due under agreement. Development regulatory and sales milestones payments. Number of additional targets for development and sales milestone payments. Milestone payment earned. Organization and significant accounting policies. Organization and significant accounting policies. Organization And Significant Accounting Policies [Table] Organization And Significant Accounting Policies [Table] Statistical Measurement Range [Axis] Statistical Measurement Range [Member] Minimum Minimum [Member] Maximum Maximum [Member] Sale of Stock Subsidiary Sale Of Stock [Axis] Sale of Stock Sale Of Stock Name Of Transaction [Domain] Common stock purchase agreement. Common Stock Purchase Agreement Common Stock Purchase Agreement [Member] Johnson and Johnson Innovation-JJDC, Incorporation. JJDC Johnson And Johnson Innovation J J D C Incorporation [Member] Janssen Pharmaceuticals, Incorporation. Janssen Janssen Pharmaceuticals Incorporation [Member] Collaborative Arrangement and Arrangement Other than Collaborative Type Of Arrangement [Axis] Collaborative Arrangement and Arrangement Other than Collaborative Arrangements And Nonarrangement Transactions [Member] Collaboration and license agreements. Collaboration and License agreements Collaboration And License Agreement [Member] License agreement. License Agreement License Agreement [Member] Collaboration agreement. Collaboration Agreement Collaboration Agreement [Member] JNJ-3989 (ARO-HBV) Agreement. JNJ-3989 (ARO-HBV) Agreement J N J3989 A R O H B V Agreement [Member] License collaboration and stock purchase agreement. License Collaboration and Stock Purchase Agreement License Collaboration And Stock Purchase Agreement [Member] AMG 890 (ARO-LPA) Agreement. AMG-890 (ARO-LPA) Agreement A M G890 A R O L P A Agreement [Member] Antidilutive Securities Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities [Axis] Antidilutive Securities, Name Antidilutive Securities Name [Domain] Stock Options Employee Stock Option [Member] Restricted Stock Units Restricted Stock Units R S U [Member] Organization And Significant Accounting Policies [Line Items] Organization And Significant Accounting Policies [Line Items] Shares issued Shares Issued Stock issued, price per share Cash received as due under agreement Cash Received As Due Under Agreement Development regulatory and sales milestones payments Development Regulatory And Sales Milestones Payments Number of additional targets for development and sales milestone payments Number Of Additional Targets For Development And Sales Milestone Payments Milestone payment Milestone Payment Earned Option payments, and development, regulatory and sales milestone payments. Milestone payment received. Option payments, and development, regulatory and sales milestone payments Option Payments And Development Regulatory And Sales Milestones Payment Milestone payment Milestone Payment Received Increase decrease in cash and investments. Short term investments Net increase (decrease) in cash and investments Increase Decrease In Cash And Investments Restricted Cash Restricted Cash And Cash Equivalents At Carrying Value Amount insured in FDIC per account Cash F D I C Insured Amount Property and equipment, useful life Property Plant And Equipment Useful Life Fair value of contingent consideration obligation due to discontinuation of clinical trials Business Combination Contingent Consideration Liability Noncurrent Calculation of effect of dilutive stock options and restricted stock units Incremental Common Shares Attributable To Share Based Payment Arrangements Anti-dilutive excluded for calculation of effect of dilutive stock options and restricted stock units Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Agreement date. Number of agreements. Schedule Of Collaborative Arrangements And Noncollaborative Arrangement Transactions [Table] Schedule Of Collaborative Arrangements And Noncollaborative Arrangement Transactions [Table] Investment, Name Schedule Of Equity Method Investment Equity Method Investee Name [Axis] Investment, Name Equity Method Investee Name [Domain] AMG 890 (ARO-LPA) and ARO-AMG1 agreement. AMG 890 (ARO-LPA) and ARO-AMG1 Agreement A M G890 A R O L P A And A R O A M G1 Agreement [Member] Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] Agreement date Agreement Date Number of agreements Number Of Agreements Cash received as due under collaboration agreement. Cash received as due under collaboration agreement Cash Received As Due Under Collaboration Agreement Revenues Contract assets Contract With Customer Asset Net Current Contract liabilities Number of additional targets for development, regulatory and sales milestone payments. Janssen Pharmaceuticals and Johnson And Johnson Innovation JJDC Incorporation. Janssen and JJDC Janssen Pharmaceuticals And Johnson And Johnson Innovation J J D C Incorporation [Member] Research collaboration and option agreement. Research Collaboration and Option Agreement Research Collaboration And Option Agreement [Member] ARO-JNJ1. ARO-JNJ1 A R O J N J1 [Member] Development, regulatory and sales milestones payments Number of additional targets for development, regulatory and sales milestone payments Number Of Additional Targets For Development Regulatory And Sales Milestone Payments Number of distinct performance obligations. Number of distinct performance obligations Number Of Distinct Performance Obligations Initial transaction price. Initial transaction price Initial Transaction Price Contract liabilities, long -term deferred revenue Contract liabilities Contract With Customer Liability Research equipment gross. Computers, office equipment and furniture Furniture And Fixtures Gross Research equipment Research Equipment Gross Software Capitalized Computer Software Gross Leasehold improvements Leasehold Improvements Gross Total gross fixed assets Property Plant And Equipment Gross Less: Accumulated depreciation and amortization Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Property and equipment, net Depreciation and amortization expense for property and equipment Depreciation Depletion And Amortization Schedule Of Held To Maturity Securities [Table] Schedule Of Held To Maturity Securities [Table] Financial Instrument Financial Instrument [Axis] Financial Instruments Transfers And Servicing Of Financial Instruments Types Of Financial Instruments [Domain] Commercial notes due within one year. Commercial Notes Due Within One Year Commercial Notes Due Within One Year [Member] Commercial notes due within three years. Commercial Notes Due Within Three Years Commercial Notes Due Within Three Years [Member] Schedule Of Held To Maturity Securities [Line Items] Schedule Of Held To Maturity Securities [Line Items] Amortized Cost Held To Maturity Securities Gross Unrealized Gains Held To Maturity Securities Accumulated Unrecognized Holding Gain Gross Unrealized Losses Held To Maturity Securities Accumulated Unrecognized Holding Loss Fair Value Held To Maturity Securities Fair Value Schedule Of Finite Lived Intangible Assets [Table] Schedule Of Finite Lived Intangible Assets [Table] Asset acquisition. Asset Acquisition Asset Acquisition [Axis] Asset acquisition. Asset Acquisition Asset Acquisition [Domain] Novartis. Novartis Novartis [Member] Finite-Lived Intangible Assets by Major Class Finite Lived Intangible Assets By Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name Finite Lived Intangible Assets Major Class Name [Domain] Licensing Agreement Licensing Agreements [Member] Patents Patents [Member] Finite Lived Intangible Assets [Line Items] Finite Lived Intangible Assets [Line Items] Amortization period of intangible assets Finite Lived Intangible Asset Useful Life Finite-lived intangible assets, accumulated amortization Finite Lived Intangible Assets Accumulated Amortization Amortization expense Amortization Of Intangible Assets Amortization of license agreements in 2020 Finite Lived Intangible Assets Amortization Expense Next Twelve Months Amortization of license agreements in 2021 Finite Lived Intangible Assets Amortization Expense Year Two Amortization of license agreements in 2022 Finite Lived Intangible Assets Amortization Expense Year Three Amortization of license agreements in 2023 Finite Lived Intangible Assets Amortization Expense Year Four Amortization of license agreements in 2024 Finite Lived Intangible Assets Amortization Expense Year Five Amortization of license agreements, thereafter Finite Lived Intangible Assets Amortization Expense After Year Five Intangible Assets Net Excluding Goodwill [Abstract] Intangible assets subject to amortization, beginning balance Intangible assets subject to amortization, Impairment Impairment Of Intangible Assets Finitelived Intangible assets subject to amortization, Amortization Intangible assets subject to amortization, ending balance Schedule Of Stock By Class [Table] Schedule Of Stock By Class [Table] Plan Name Plan Name [Axis] Plan Name Plan Name [Domain] Two thousand four equity incentive plan two thousand thirteen equity incentive plan and inducement grants. 2004 Equity Incentive Plan, 2013 Equity Incentive Plan, and Inducement Grants Two Thousand Four Equity Incentive Plan Two Thousand Thirteen Equity Incentive Plan And Inducement Grants [Member] Janssen and JJDC Class Of Stock [Line Items] Class Of Stock [Line Items] Capital stock authorized for issuance Capital Units Authorized Preferred stock, shares authorized Preferred Stock Shares Authorized Preferred stock, par value Preferred Stock Par Or Stated Value Per Share Common Stock, Share reserve for issuance Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Shares issued Common stock shares sold, price per share Sale Of Stock Price Per Share Proceeds from the issuance of common stock Percentage of increase in annual rental cost. Lease payments commencement date. Expected payments of leasehold improvements, net of tenant improvement allowances. Other Commitments [Table] Other Commitments [Table] Property Subject to or Available for Operating Lease Property Subject To Or Available For Operating Lease [Axis] Property Subject to or Available for Operating Lease Property Subject To Or Available For Operating Lease [Domain] Corporate Headquarters in Pasadena Corporate Headquarters In Pasadena Corporate Headquarters In Pasadena [Member] Counterparty Name Counterparty Name [Axis] Counterparty Name Repurchase Agreement Counterparty Name [Domain] Colorado Owner, LLC. Colorado Owner, LLC Colorado Owner L L C [Member] Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] California CALIFORNIA Research facility in Madison. Research Facility in Madison Research Facility In Madison [Member] Wisconsin WISCONSIN Other Commitments Other Commitments [Axis] Other Commitments Other Commitments [Domain] Technology license commitments. Technology License Commitments Technology License Commitments [Member] Other Commitments [Line Items] Other Commitments [Line Items] Lease term Lessee Operating Lease Term Of Contract Office space leases, in square feet Land Subject To Ground Leases Lease payments, commencement date Lease Payments Commencement Date Estimated lease payments Operating Leases Future Minimum Payments Due Expected leasehold improvements, net of tenant improvement allowances Expected Payments Of Leasehold Improvements Net Of Tenant Improvement Allowances Rental expense Lease And Rental Expense Percentage of increase in annual rental cost Percentage Of Increase In Annual Rental Cost Lease expiration month and year. Operating lease expiration month and year Lease Expiration Month And Year Primary tenant improvement allowance accounted for as deferred rent Deferred Rent Credit Promissory note payable Notes Payable Facility rent expense Operating Leases Rent Expense Net Leases [Abstract] 2020 Operating Leases Future Minimum Payments Due Current 2021 Operating Leases Future Minimum Payments Due In Two Years 2022 Operating Leases Future Minimum Payments Due In Three Years 2023 Operating Leases Future Minimum Payments Due In Four Years 2024 Operating Leases Future Minimum Payments Due In Five Years 2025 and thereafter Operating Leases Future Minimum Payments Due Thereafter Total Future commitments Purchase Obligation Commitments expected to be incurred in fiscal 2019 Purchase Obligation Due In Next Twelve Months Commitments expected to be incurred beyond fiscal 2019 Purchase Obligation Due In Second Year Milestone payments. Milestone payments Milestone Payments Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Two thousands four equity incentive plan. 2004 Equity Incentive Plan Two Thousands Four Equity Incentive Plan [Member] Two thousands thirteen incentive plan. 2013 Incentive Plan Two Thousands Thirteen Incentive Plan [Member] Outside of equity compensation plans. Outside Of Equity Compensation Plans Outside Of Equity Compensation Plans [Member] Award Type Award Type [Axis] Award Type Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Employee Stock Option Restricted Stock Units (RSUs) Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Shares reserve for issuance Common Stock Capital Shares Reserved For Future Issuance Number of options outstanding Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number Number of restricted stock units outstanding Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding Number Number of options outstanding, granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross Number of restricted stock units outstanding, granted Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Number of Options Outstanding, beginning balance Number of Options Outstanding, Granted Number of Options Outstanding, Cancelled Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period Number of Options Outstanding, Exercised Number of Options Outstanding, ending balance Number of Options Outstanding, Exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number Weighted-Average Exercise Price Per Share, beginning balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Weighted-Average Exercise Price Per Share, Granted Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price Weighted-Average Exercise Price Per Share, Cancelled Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price Weighted-Average Exercise Price Per Share, Exercised Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price Weighted-Average Exercise Price Per Share, ending balance Weighted-Average Exercise Price Per Share, Exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price Weighted-Average Remaining Contractual Term Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 Weighted-Average Remaining Contractual Term, Exercisable Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 Aggregate Intrinsic Value Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value Aggregate Intrinsic Value, Exercisable Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 Stock-based compensation expense Allocated Share Based Compensation Expense Grant date fair value of the options granted during the period. Grant date fair value of the options granted Grant Date Fair Value Of Options Granted During Period Intrinsic value of options exercised Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value Unrecognized pre-tax compensation expense Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options Weighted average period to recognize pre-tax compensation expense Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Abstract] Dividend yield Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate Risk-free interest rate, minimum Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Minimum Risk-free interest rate, maximum Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Maximum Volatility Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Expected life (in years) Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 Weighted average grant date fair value per share of options granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value RSU awards vesting, description Share Based Compensation Arrangement By Share Based Payment Award Description Number of RSUs, Unvested, beginning of period Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Number of RSUs, Granted Number of RSUs, Vested Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Number of RSUs, Forfeited Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period Number of RSUs, Unvested, End of period Weighted-Average Grant Date Fair Value, beginning balance Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value Weighted-Average Grant Date Fair Value, Granted Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value Weighted-Average Grant Date Fair Value, Vested Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value Weighted-Average Grant Date Fair Value, Forfeited Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value Weighted-Average Grant Date Fair Value, ending balance Unrecognized pre-tax compensation expense Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options Held to maturity securities fair value non current. Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Measurement Frequency Fair Value By Measurement Frequency [Axis] Measurement Frequency Fair Value Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value Measurements Recurring [Member] Fair Value Hierarchy and NAV Fair Value By Fair Value Hierarchy Level [Axis] Fair Value Hierarchy and NAV Fair Value Measurements Fair Value Hierarchy [Domain] Level 1 Fair Value Inputs Level1 [Member] Level 2 Fair Value Inputs Level2 [Member] Level 3 Fair Value Inputs Level3 [Member] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Cash and cash equivalents Cash And Cash Equivalents Fair Value Disclosure Short-term investments Long-term investments Held To Maturity Securities Fair Value Non Current Contingent Consideration Contingent consideration obligations Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from in-process research and development costs. Amount of deferred tax liability attributable to taxable temporary differences from state tax deductions. Deferred tax assets: Deferred Tax Assets Net [Abstract] Accrued compensation Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Stock compensation Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost Capitalized research and development Deferred Tax Assets In Process Research And Development Cost Fixed Assets Deferred Tax Assets Property Plant And Equipment Net operating losses Deferred Tax Assets Operating Loss Carryforwards Intangible Assets Deferred Tax Assets Goodwill And Intangible Assets California Alternative Minimum Tax Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax Deferred Rent Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Deferred Rent Capital Loss Deferred Tax Assets Capital Loss Carryforwards Total deferred tax assets Deferred Tax Assets Gross Valuation allowance Deferred Tax Assets Valuation Allowance Deferred tax liabilities: Deferred Tax Liabilities Net [Abstract] State taxes Deferred Tax Liabilities State Taxes Total deferred tax liability Deferred Income Tax Liabilities Net deferred tax assets (liabilities) Deferred Tax Assets Liabilities Net Percentage of valuation allowance. Valuation allowance against deferred tax assets Percentage Of Valuation Allowance Federal net operating loss carry forward. State net operating loss carry forwards. Gross federal net operating loss carry forwards Federal Net Operating Loss Carry Forward Gross state net operating loss carry forwards State Net Operating Loss Carry Forwards Federal: Federal Income Tax Expense Benefit Continuing Operations [Abstract] Current Current Federal Tax Expense Benefit Deferred Deferred Federal Income Tax Expense Benefit Total Federal Federal Income Tax Expense Benefit Continuing Operations State: State And Local Income Tax Expense Benefit Continuing Operations [Abstract] Current Current State And Local Tax Expense Benefit Deferred Deferred State And Local Income Tax Expense Benefit Total State State And Local Income Tax Expense Benefit Continuing Operations Provision from income taxes Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to stock compensation. Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to mark-to-market adjustments. At U.S. federal statutory rate Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate State taxes, net of federal effect Effective Income Tax Rate Reconciliation State And Local Income Taxes Stock compensation Effective Income Tax Rate Reconciliation Deductions Stock Compensation Percent Mark-to-market adjustments Effective Income Tax Rate Reconciliation Mark To Market Adjustments Valuation allowance Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance Federal tax rate change in 2018 Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate Effective income tax rate Effective Income Tax Rate Continuing Operations U.S. federal statutory rate Revaluation provision to income tax expense Tax Cuts And Jobs Act Of2017 Change In Tax Rate Income Tax Expense Benefit Schedule Of Defined Benefit Plans Disclosures [Table] Schedule Of Defined Benefit Plans Disclosures [Table] Retirement Plan Type Retirement Plan Type [Axis] Retirement Plan Type Retirement Plan Type [Domain] Employee contributions up to three percent. Employee Contributions up to 3% Employee Contributions Up To Three Percent [Member] Employee contribution next two percent. Employee Contributions Next 2% Employee Contribution Next Two Percent [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Discretionary match percentage Defined Contribution Plan Employer Matching Contribution Percent Of Match Percentage of compensation Defined Contribution Plan Employer Matching Contribution Percent Employee benefits costs Defined Contribution Plan Cost Recognized Revenues Operating Income (Loss) Net Income (Loss) Net Income (Loss) per share - BASIC Net Income (Loss) per share - DILUTED