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Schedule of Supplemental Cash Flow Information Related to Lease [Table Text Block] Schedule of Supplemental Cash Flow Information Related to Lease Weighted-average shares of common stock outstanding, basic Weighted average shares used in computing basic Weighted Average Number of Shares Outstanding, Basic, Total Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Aggregate Intrinsic Value, Exercisable Schedule of Reconciliation of U.S. Federal Statutory Income Tax Rate to Effective Income Tax Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Deferred Tax Liabilities, Leasing Arrangements Lease right-of-use assets Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Long-Lived Tangible Asset [Domain] Valuation Allowance [Abstract] Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block] Deferred Tax Assets, Net [Abstract] Subsequent Events [Text Block] Subsequent Events Non Cash Interest Expense Non cash interest expense. 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Term B Loan Property, Plant and Equipment, Useful Life Property and equipment, useful life New Accounting Pronouncements, Policy [Policy Text Block] Recent Accounting Pronouncements Collaboration, option and license agreement. Collaboration Option and License Agreement Description Collaboration, option and license agreement, description Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Shares of common stock converted Conversion of redeemable convertible preferred stock into common stock in connection with initial public offering ,Shares Shares of common stock converted Stock Issued During Period, Shares, Conversion of Convertible Securities Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Vesting period Two Thousand Nineteen and Two Thousand Twenty Four Incentive Plan [Member] Two Thousand Nineteen and Two Thousand Twenty Four Incentive Plan [Member] 2019 Plan and 2024 Plan [Member] Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Risk-free interest rate, minimum Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Depreciation Depreciation, Total Depreciation expense Employees purchase shares of common stock at a discount price per share percentage. Employees Purchase Shares of Common Stock at a Discount Price per Share Percentage Employees purchase shares of common stock at a price per share, percentage of the lower of the fair market value Patent License Agreements. Patent License Agreements [Member] Patent License Agreements Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common stock shares outstanding Operating Lease, Liability, Current Operating lease liabilities, short-term portion Less: current portion Loan Facility [Member] Loan facility member. Loan Facility Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] License consideration payment. 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Aggregate offering price of shares of its common stock, shares of its preferred stock, debt securities, warrants, rights, units and/or depositary shares Aggregate offering price of shares of its common stock, shares of its preferred stock, debt securities, warrants, rights, units and/or depositary shares Summary of Restricted Stock Units Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Cybersecurity Risk Management Processes Integrated [Text Block] Proceeds from sale of stock Sale of Stock, Consideration Received Per Transaction Net loss Net loss Net loss Segment loss and net loss Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Aggregate Intrinsic Value, Outstanding Lease liabilities Deferred Tax Assets Lease liabilities Deferred tax assets lease liabilities. Sublicense fee to be offset against future milestone payable. 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Other Accrued Expenses and Current Liabilities Other accrued expenses and current liabilities Total other accrued expenses and current liabilities Document Fiscal Year Focus Document Fiscal Year Focus Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Cash flows from investing activities Accounts Payable, Current Accounts payable Accounts Payable, Current, Total Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value Fair value of options vested Interest Expense, Nonoperating Interest Expense, Nonoperating, Total Interest expense Research and Development Expense [Member] Research and Development Research and Development Expense Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Available-for-Sale Marketable Securities Increase (Decrease) in Other Noncurrent Assets Other non-current assets Other non-current assets ATM facility ATM Facility [Member] ATM facility. Research Tax Credit Carryforward [Member] Research Fair Value Measurement, Policy [Policy Text Block] Fair Value Measurement Proceeds from Stock Options Exercised Proceeds from exercise of common stock options Fair Value Disclosures [Abstract] Commitments and Contingencies Disclosure [Abstract] Milestone payments achieved or probable. 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Series A-2 Redeemable Convertible Preferred Stock [Member] Series A-2 Redeemable Convertible Preferred Stock Denominator Abstract Denominator Abstract Denominator Income Taxes Income Tax Disclosure [Text Block] Finance Lease Cost. Finance Lease Cost [Abstract] Finance lease cost: Collaborative Arrangement and Arrangement Other than Collaborative [Table] Temporary Equity, Issuance of Series B redeemable convertible preferred stock for cash, net of issuance costs of $51, Shares Temporary equity shares issued Redeemable convertible preferred stock outstanding Inducement equity incentive plan. 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NIH Agreement Beth Seidenberg, M.D [Member] Beth Seidenberg, M.D Beth Seidenberg, M.D Document Annual Report IPO [Member] Initial Public Offering IPO Segment Interest Income Segment interest income. Interest income Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Expiration period Options under the Plan may be granted for periods Deferred Tax Assets, Operating Loss Carryforwards, Domestic Federal tax net operating loss carryforwards Maximum [Member] Maximum Schedule of Stock by Class [Table Text Block] Schedule of Common Stock Reserved for Future Issuance Statistical Measurement [Axis] Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Exercised (in USD per share) Term C Loan Term C Loan [Member] Term c loan member. Common Stock, Value, Issued Common stock, $0.00001 par value; 490,000,000 shares authorized as of December 31, 2025 and 2024, respectively; 60,389,893 and 43,214,918 shares issued and outstanding as of December 31, 2025 and 2024, respectively Drew funds from tranche Drew Funds From Tranche Drew funds from tranche. Finance Lease, Principal Payments Financing cash flows from finance leases Principal paid on finance lease liabilities Line of Credit Facility, Expiration Date Loan facility, date of maturity Interest Receivable, Noncurrent Accrued interest receivable KYV-101 KYV One Zero One [Member] KYV-101. Tranche Two and Three [Member] Tranche two and three. 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Right-of-use asset obtained in exchange for operating and finance lease liability Right-of-use asset obtained in exchange for operating and finance lease liability Interest Payable, Current Accrued interest Accrued interest Interest payable Lessee, Finance Lease, Description Finance lease, description Common stock remaining available unallocated amount Common Stock Remaining Available Unallocated Amount Common stock remaining available unallocated amount. Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Dominic Borie[Member] Dominic borie. Dominic Borie Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Percent Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Percent, Total Worldwide changes in unrecognized tax benefits Related Party Transaction [Line Items] Employee Stock [Member] Shares Available For Future Grants Under Employee Stock Purchase Plan Entity Registrant Name Entity Registrant Name Underwritten Public Offering Underwritten Public Offering [Member] Underwritten Public Offering Minimum annual royalty payments. Minimum Annual Royalty Payments Minimum annual royalty payments License and upfront fees Deferred Tax Assets License and Upfront Fees Deferred tax assets license and upfront fees. Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Total Unrealized Losses Entity Voluntary Filers Other Nonoperating Income (Expense) Other expense, net Other Nonoperating Income (Expense), Total Other income, net Subsequent Events [Abstract] Cybersecurity Risk Management Positions or Committees Responsible [Flag] Sales Agreement Prospectus [Member] sales agreement prospectus. ATM Prospectus Income tax expense Income Tax Expense (Benefit) Effective income tax rate Increase decrease in other accrued expenses and current liabilities. Increase Decrease in Other Accrued Expenses and Current Liabilities Other accrued expenses and current liabilities Measurement Frequency [Axis] Proceeds from Issuance of Common Stock Proceeds from issuance of common stock under the ATM Facility, net of agent's fees Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Entity Common Stock, Shares Outstanding Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentrations of Credit Risk Compensation Related Costs, Policy [Policy Text Block] Stock-Based Compensation Expense Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Consolidation Items [Axis] Term A Loan [Member] Term a loan member. Term A Loan Payments to Acquire Property, Plant, and Equipment Payments to Acquire Property, Plant, and Equipment, Total Purchases of property and equipment Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Shares granted Assets Total assets Property, Plant and Equipment [Table] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Weighted Average Remaining Contractual Term, Exercisable Income Statement [Abstract] Finance Lease, Interest Payment on Liability Operating cash flows from finance leases Decrease in tax positions in prior periods Decrease in tax positions in prior periods Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Temporary equities, value, conversion of convertible securities. Temporary Equities, Value, Conversion of Convertible Securities Temporary equity, Conversion of redeemable convertible preferred stock into common stock in connection with initial public offering Gilead Sciences, Inc. and Kite Pharma, Inc. Gilead Sciences, Inc. and Kite Pharma, Inc. [Member] Gilead Sciences, Inc. and Kite Pharma, Inc. [Member] Stock Issued During Period, Shares, New Issues Shares issued Issuance of common stock upon public offering, net of underwriting commissions and issuance costs Temporary Equity, Shares Authorized Temporary equity shares authorized Change in Accounting Principle, Type [Extensible Enumeration] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Shares vested Shares vested Net loss per share attributable to common stockholders, diluted Earnings Per Share, Diluted, Total Schedule of Segment Reporting Information, by Segment [Table Text Block] Summary of Segment Loss Including Significant Segment Expenses Operating Segments [Member] Operating Segment Effective Income Tax Rate Reconciliation, Percent [Abstract] Title and Position [Domain] Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration] City Area Code City Area Code Kite License Agreement. Kite License Agreement [Member] Kite License Agreement Auditor Name Finance Lease, Liability, Noncurrent Non-current lease liabilities Finance lease liabilities, net of short-term portion Percentage of Outstanding Shares of Common Stock Percentage of Outstanding Shares of Common Stock Percentage of common stock outstanding Debt Instrument, Face Amount Promissory note principal amount Aggregate principal amount Purchase of additional shares of common stock Purchase of Additional Shares of Common Stock Purchase of additional shares of common stock. Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Counterparty Name [Domain] Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount Research credits Variable Lease, Cost Variable lease cost Conversion of redeemable convertible preferred stock into common stock on completion of initial public offering, shares. 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Gross Proceeds From Issuance Initial Public Offering Gross proceeds Lease, Cost [Table Text Block] Components of Lease Expense Change in Accounting Principle, Accounting Standards Update, Adopted [true false] Unamortized Debt Issuance Expense Unamortized debt issuance Auditor Location External research and development expenses allocated by program External Research And Development Expenses Allocated By Program External research and development expenses allocated by program. Earnings Per Share Reconciliation [Abstract] Numerator: Schedule of Potential Shares of Common Stock that were Excluded from the Computation of Diluted Net Loss Per Share Corporate Debt Securities [Member] Corporate debt obligations Income Tax Jurisdiction [Domain] Debt Securities, Available-for-Sale [Table] Entity Interactive Data Current Entity Interactive Data Current Statement of Income Location, Balance [Domain] Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Cash flows from operating activities: Furniture and Fixtures [Member] Furniture and Fixtures Accretion (Amortization) of Discounts and Premiums, Investments Accretion of discounts on available-for-sale marketable securities Accretion of discounts on available-for-sale marketable securities Unpaid deferred offering costs included in accounts payable and other current liabilities. Unpaid Deferred Offering Costs Included In Accounts Payable And Other Current Liabilities Unpaid offering costs included in accounts payable and other current liabilities Benchmark Royalties Benchmark royalties. Benchmark royalties Cash Equivalents, at Carrying Value Cash Equivalents Cash Equivalents, at Carrying Value, Total Loan facility of tranches, amount Line of Credit Facility, Current Borrowing Capacity Entity Tax Identification Number Entity Tax Identification Number Share Price Share price Price per share Long-Term Debt, Type [Axis] Schedule of Other Accrued Expenses and Current Liabilities Schedule of Other Accrued Expenses and Current Liabilities [Table Text Block] Schedule of Other accrued expenses and current liabilities Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Description of Business, Organization and Liquidity Marketable Security, Unrealized Gain (Loss) Income Tax Authority, Name [Domain] Local Phone Number Local Phone Number Related Party Transaction [Domain] Short-Term Lease, Cost Short-term lease cost Auditor Opinion [Text Block] Finance Lease, Liability, to be Paid, Year Two 2026 Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Stock issuance costs Accounting Policies [Abstract] Term loan Long-Term Line of Credit, Noncurrent Class of Stock [Domain] Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Shares available for future grant Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Weighted average period over which unrecognized compensation is expected to be recognized (in years) Cash, Cash Equivalents, and Short-Term Investments Cash and cash equivalents and available-for-sale marketable securities Cash, Cash Equivalents, and Short-Term Investments, Total Stock, Class of Stock [Table] Entity Emerging Growth Company Entity Emerging Growth Company Indefinite-Lived Intangible Assets [Axis] Area of Land Area of land Lessee operating lease square feet leased Tax Credit Carryforward, Name [Domain]