Risks and Uncertainties Risks and Uncertainties Policy [Policy Text Block] Disclosure of accounting policy for risks and uncertainties. Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Statistical Measurement [Domain] Statistical Measurement [Domain] Foreign Plan Foreign Plan [Member] Award Timing Predetermined Award Timing Predetermined [Flag] Entity File Number Entity File Number Additional Paid-in Capital Additional Paid-in Capital [Member] Accrued bonus Accrued Bonus Cost Current Carrying value as of the balance sheet date of obligations incurred through that date and payable for bonus costs, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Private Placement February 2026 Private Placement February 2026 [Member] Private Placement February 2026 Tabular List, Table Tabular List [Table Text Block] Recently Issued Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Maximum amount of development and regulatory milestone payments Asset Acquisition, Consideration, Maximum Development And Regulatory Milestone Payments Based On Respective Thresholds Of Net Sales Of Products Represents the maximum amount of development and regulatory milestone payments based on respective thresholds of net sales of products (developed from the licensed compound) (the "Products") in asset acquisition. Equity Award Mofication Equity Award Mofication [Member] Equity Award Mofication Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Class of warrant or right, outstanding Class of Warrant or Right, Outstanding Net loss per share, basic (in dollars per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Total shares reserved for issuance Common Stock, Capital Shares Reserved for Future Issuance Subsidiary or Equity Method Investee, Sale of Stock, Type [Table] Subsidiary or Equity Method Investee, Sale of Stock, Type [Table] Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Directors Executives And Employees Directors Executives And Employees [Member] Represent information pertaining to directors, executives, and employees. Stone Peach Properties, LLC Stone Peach Properties, LLC [Member] Represents the information pertaining to Stone Peach Properties, LLC. Adjustment to Compensation, Amount Adjustment to Compensation Amount Share-based compensation expense Share-Based Payment Arrangement, Noncash Expense Shares issuable upon exercise of options to purchase Class A Ordinary Shares Share-Based Payment Arrangement, Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Other general and administrative expenses Other General and Administrative Expense Antidilutive Securities [Axis] Antidilutive Securities [Axis] Insider Trading Policies and Procedures [Line Items] Total share-based compensation expense Share-Based Payment Arrangement, Expense Class A ordinary shares authorized (in shares) Common Stock, Shares Authorized Research and development inventive credit Research And Development Incentive Credits, Pending Claim, Amount Research And Development Incentive Credits, Pending Claim, Amount Issuance of Class A ordinary shares (in shares) Stock Issued During Period, Shares, New Issues Current assets Assets, Current [Abstract] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period Total liabilities and shareholders’ equity Liabilities and Equity Summary of Significant Accounting Policies Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Number of Options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Maximum annual earned royalty at a marginal royalty rate Asset Acquisition, Consideration, Maximum Percentage of Payment of Annual Earned Royalty At A Marginal Royalty Rate Represents the maximum percentage of payment of annual earned royalty at a marginal royalty rate. Liabilities and Shareholders’ Equity Liabilities and Equity [Abstract] Anthor Anthor [Member] Anthor Other income, net Other Nonoperating Income (Expense) [Abstract] Cover [Abstract] Cover [Abstract] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Maximum Maximum [Member] General and administrative General and Administrative Expense [Member] Period for payment of milestone payment Period for payment of Milestone Payment The period for payment of milestone payment. Accounting Policies [Abstract] Accounting Policies [Abstract] Notice period ( in days) Class of Warrant or Right, Threshold Notice Period The period of notice in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. At The Market Offering At The Market Offering [Member] Represents information pertaining to At The Market Offering. License Agreements Asset Acquisition [Text Block] Restricted share awards Restricted Stock [Member] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Class of Warrant or Right [Axis] Class of Warrant or Right [Axis] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Loss before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Name Measure Name Shareholders' Equity Temporary Equity Disclosure and Stockholders' Equity Note Disclosure [Text Block] The entire disclosure for temporary equity and shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income Maximum amount of sales milestone payments Asset Acquisition, Consideration, Maximum Sales Milestone Payments Based On Respective Thresholds Of Net Sales Of Products Represents the maximum amount of sales milestone payments based on respective thresholds of net sales of products (developed from the licensed compound) (the "Products") in asset acquisition. Document Fiscal Period Focus Document Fiscal Period Focus Award Timing Method Award Timing Method [Text Block] Award Type Award Type [Axis] Total assets Assets Shareholders' Equity Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] Trading Symbol Trading Symbol Vested, Weighted Average Grant Date Fair Value (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Stock option exercises and restricted stock unit releases (in Shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Entity Address, City or Town Entity Address, City or Town Cash flows from operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Stock-based compensation Share-Based Payment Arrangement, Noncash Expense, Adjusted Share-Based Payment Arrangement, Noncash Expense, Adjusted Other segment items Segment Reporting, Other Segment Item, Amount Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Shares issuable upon vesting of restricted share units Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Statement of Income Location, Balance [Domain] Statement of Income Location, Balance [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Emerging Growth Company Entity Emerging Growth Company Tibulizumab SSc program Tibulizumab SSc Program [Member] Tibulizumab SSc Program Shares issuable upon exercise of pre-funded warrants to purchase Class A Ordinary Shares Warrant [Member] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Tibulizumab HS program Tibulizumab HS Program [Member] Tibulizumab HS Program Class A ordinary shares outstanding (in shares) Beginning Balance (in shares) Ending Balance (in Shares) Common Stock, Shares, Outstanding Plan Name [Axis] Plan Name [Axis] PEO PEO [Member] Interest income Investment Income, Interest US UNITED STATES Changes in operating assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Expected volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Proceeds from sale of shares and warrants Proceeds from Issuance or Sale of Equity Accumulated Deficit Retained Earnings [Member] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Number of RSUs Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Share-Based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Cash and cash equivalents, beginning of period Cash and cash equivalents, ending of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Aggregate amount of shares reserved Capital Shares Reserved for Future Issuance, Amount Aggregate amount of shares reserved for future issuance. Income tax benefit Income Tax Expense (Benefit) Sale of Stock [Domain] Sale of Stock [Domain] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Product and Service [Domain] Product and Service [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Net loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Proceeds from exercise of stock options Proceeds from Stock Options Exercised Proceeds from issuance of Class A Ordinary Shares in connection with February 2026 Equity Offering, net of $8.0 million of underwriters’ fees and discounts Proceeds from Issuance of Private Placement City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Options vested and exercisable, Weighted Average Remaining Contractual Life (Years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Athanor agreement, upfront fee Milestone Payment, Upfront Fee Milestone Payment, Upfront Fee Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Cash flows from investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] General and administrative General and Administrative Expense Unrecognized share-based compensation expense Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash used in operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Employers matching contribution, annual vesting percentage Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage Preferred shares, par value per share (in dollars per share) Preferred Stock, Par or Stated Value Per Share Schedule of Weighted-Average Assumptions Used to Estimate The Fair Value Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Options vested and exercisable (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Equity Components [Axis] Equity Components [Axis] Entity Ex Transition Period Entity Ex Transition Period Percentage of shares outstanding immediately after giving effect to exercise of share exchange Threshold Percentage Of Outstanding Shares Owned, Shareholder Election Upon Written Notice Threshold percentage of outstanding shares owned beyond which increase is not possible. Accelerated vesting percent of shares Share-Based Compensation Arrangement by Share-Based Payment Award, Accelerated Vesting, Percent Share-Based Compensation Arrangement by Share-Based Payment Award, Accelerated Vesting, Percent Asset Acquisition [Abstract] Asset Acquisition [Abstract] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of claims filed Research And Development Incentive Credits, Number Of Claims Filed Research And Development Incentive Credits, Number Of Claims Filed Number of reportable segments Number of Reportable Segments Supplemental Disclosure Supplemental Cash Flow Information [Abstract] Other Performance Measure, Amount Other Performance Measure, Amount Weighted Average Exercise Price (per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Entity Address, State or Province Entity Address, State or Province Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Total current liabilities Liabilities, Current Over-Allotment Option Over-Allotment Option [Member] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation Agreement with Pfizer License Agreement and a Series A-1 Subscription and Shareholder's Agreement with Pfizer [Member] Represents the member information pertaining to License Agreement and a Series A-1 Subscription and Shareholder's Agreement with Pfizer. Individual: Individual [Axis] BAFFX17, Ltd BAFFX17, Ltd [Member] Represents the information pertaining to BAFFX17, Ltd. Defined contribution plan expenses Defined Contribution Plan, Cost Research and development Research and Development Expense [Member] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Basis of Presentation and Principles of Consolidation Basis of Accounting, Policy [Policy Text Block] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Entity Interactive Data Current Entity Interactive Data Current Plan Name [Domain] Plan Name [Domain] Pre-Funded Warrants Pre-Funded Warrants [Member] Represents the information pertaining to Pre-Funded Warrants. Share-based compensation expense expected to be recognized over a weighted average period Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Fair Value Measurements Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Increase (Decrease) in Stockholders' Deficit Increase (Decrease) in Stockholders' Equity [Roll Forward] Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Issuance of shares, transaction costs Stock Issued, Transaction Costs The amount of transaction costs on stock issued. Lonza milestone payment Lonza License Agreement [Member] Represents the information pertaining to Lonza license agreement. Equity Incentive Plan 2023 Equity Incentive Plan 2023 [Member] Represents information pertaining to 2023 equity incentive plan. Depreciation and amortization Depreciation, Depletion and Amortization Other assets Other Assets, Noncurrent Entity Central Index Key Entity Central Index Key PEO Name PEO Name Aggregate sales price Sale of Stock, Consideration Received on Transaction Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Exercise price of warrants (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Segments [Axis] Segments [Axis] Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Local Phone Number Local Phone Number Outside of equity plan Outside Of Equity Incentive Plan [Member] The information pertaining to side Of Equity Incentive Plan. Accrued research and development costs Accrued Research And Development Expense Current Carrying value as of the balance sheet date of obligations incurred through that date and payable for research and development expense. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Share-based Compensation Share-Based Payment Arrangement [Text Block] Assets Assets [Abstract] Athanor Letter Agreement Athanor Letter Agreement [Member] Athanor Letter Agreement Underlying Security Market Price Change Underlying Security Market Price Change, Percent Class of Warrant or Right [Domain] Class of Warrant or Right [Domain] Fair Value Measurements Fair Value Disclosures [Text Block] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Percentage of discount for eligible employees Common Stock, Discount on Shares, Percentage Percentage of Discount on common shares, or any unamortized balance thereof, shown separately as a deduction from the applicable account(s) as circumstances require. Entity Address, Address Line One Entity Address, Address Line One Beginning Balance Ending Balance Temporary Equity, Including Noncontrolling Interest Research and development Research and Development Expense Percentage of net sales Payment For The Product On Net Sales, Percentage Payment For The Product On Net Sales, Percentage Fair Value as of Grant Date Award Grant Date Fair Value Entity Registrant Name Entity Registrant Name Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Wages and benefits Labor and Related Expense Contingent payments due Contingent Payment Due The amount of contingent payments due. Title and Position [Domain] Title and Position [Domain] Upfront fee payment period Upfront Fee Payment Period Upfront Fee Payment Period Document Quarterly Report Document Quarterly Report Aggregate Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Aggregate Intrinsic Value [Abstract] No definition. Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Counterparty Name [Domain] Counterparty Name [Domain] Number of operating segments Number of Operating Segments Options outstanding, Aggregate Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Options outstanding, Weighted Average Remaining Contractual Life (Years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Schedule of accounts payable and accrued expenses Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Shares available for grant under 2023 Equity Incentive Plan and ESPP Equity Incentive Plan 2023 And Employee Stock Purchase Plan 2023 [Member] Represents information pertaining to 2023 equity incentive plan and 2023 employee stock purchase plan. Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Restatement Determination Date: Restatement Determination Date [Axis] Stock option exercises and restricted stock unit releases Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Non-PEO NEO Non-PEO NEO [Member] Schedule of financial assets and liabilities measured at fair value on a recurring basis Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] Sale of Stock [Axis] Sale of Stock [Axis] Name Trading Arrangement, Individual Name All Award Types Award Type [Domain] Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Compensation Amount Outstanding Recovery Compensation Amount Expected dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Recovery of Erroneously Awarded Compensation Disclosure [Line Items] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name Accounts Payable and Accrued Expenses Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Beginning balance, Weighted Average Grant Date Fair Value (in dollars per share) Ending balance, Weighted Average Grant Date Fair Value (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Minimum net proceeds from sale of assets for one-time milestone payment Minimum Net Proceeds From Sale Of Assets For One-Time Milestone Payment The minimum net proceeds from sale of assets for one-time milestone payment. Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Matching contribution percent Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay License Agreements Asset Acquisition [Line Items] Share-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Defined Contribution Plans Defined Contribution Plan Disclosure [Line Items] Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Options vested and exercisable, Aggregate Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Annual milestone payment, due and payable Annual Milestone Payment, Due And Payable Amount of milestone payment to be made annually under the terms of agreement. Segments [Domain] Segments [Domain] Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Axis] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Shares issuable upon exercise of Z33 Series Seed Preferred Shares Put Right Z33 Series Seed Preferred Shares Put Right [Member] Represents the information pertaining to Z33 Series Seed Preferred Shares Put Right. Warrants issued (in shares) Class of Warrant or Right, Number of Securities Called by Warrants or Rights Minimum Minimum [Member] Net Loss Per Share Earnings Per Share, Policy [Policy Text Block] Company Selected Measure Name Company Selected Measure Name Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable, Current Amount of license costs payable Accrued License Costs The amount of license costs payable. Defined Contribution Plan [Table] Defined Contribution Plan [Table] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] All Executive Categories All Executive Categories [Member] Share price Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Share Price Share price for the exchange of the underlying asset relating to the share-based payment award. Consecutive trading days Share-Based Compensation Arrangement by Share-Based Payment Award, Weighted Average Exercise Price, Threshold Consecutive Trading Days Share-Based Compensation Arrangement by Share-Based Payment Award, Weighted Average Exercise Price, Threshold Consecutive Trading Days Tibulizumab general Tibulizumab General [Member] Tibulizumab General Class A Ordinary Shares, $0.0001 par value; 300,000,000 shares authorized as of March 31, 2026 and December 31, 2025; 94,880,710 and 73,680,710 shares issued and outstanding as of March 31, 2026 and December 31, 2025, respectively Common Stock, Value, Issued Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Title and Position [Axis] Title and Position [Axis] Weighted-average shares outstanding, diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Segments Segment Reporting, Policy [Policy Text Block] Commitments and contingencies (Note 8) Commitments and Contingencies Transaction costs for February 2026 Equity Offering included in accounts payable and accrued expenses Transaction costs for Equity Offering Included In Accounts Payable And Accrued Expenses Transaction costs for Equity Offering Included In Accounts Payable And Accrued Expenses Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Entity Small Business Entity Small Business Noncontrolling Interest Noncontrolling Interest [Member] R&D Incentive Credits Research And Development Incentive Credits [Policy Text Block] Research And Development Incentive Credits Document Transition Report Document Transition Report Underlying Securities Award Underlying Securities Amount Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Common Class A Common Class A [Member] UK UNITED KINGDOM Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Employee Stock Purchase Plan Employee Stock Purchase Plan [Member] Represents the information pertaining to employee stock purchase plan. Total shareholders’ equity Beginning Balance Ending Balance Equity, Including Portion Attributable to Noncontrolling Interest Defined Contribution Plans Defined Contribution Plan [Text Block] Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Name Outstanding Recovery, Individual Name Additional paid-in capital Additional Paid in Capital Product and Service [Axis] Product and Service [Axis] Domestic Plan Domestic Plan [Member] Asset Acquisition [Domain] Asset Acquisition [Domain] Proceeds from issuance of Class A Ordinary Shares in connection with a sale under the ATM, net of $0.2 million of commissions Proceeds from Issuance of Common Stock Schedule of shares reserved for issuance Summary of Shares Reserved For Issuance [Table Text Block] The tabular disclosure of shares reserved for issuance. All Individuals All Individuals [Member] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Options vested and exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Name Forgone Recovery, Individual Name Expiration term (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Defined Contribution Plan [Abstract] Defined Contribution Plan [Abstract] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Market-Based Share Options Market-Based Performance Share Options [Member] Represents the member information pertaining to Market-Based Performance Share Options. Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Current liabilities Liabilities, Current [Abstract] Total operating expenses Operating Expenses Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Level 1 Fair Value, Inputs, Level 1 [Member] Foreign exchange transaction loss Gain (Loss), Foreign Currency Transaction, before Tax Net loss per share, diluted (in dollars per share) Earnings Per Share, Diluted Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Title of 12(b) Security Title of 12(b) Security Supplemental Disclosure of Non-Cash Investing and Financing Activities Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Sale of stock, number of shares issued in transaction (in shares) Sale of Stock, Number of Shares Issued in Transaction Weighted Average Remaining Contractual Life (Years) Share-Based Compensation Arrangement by Share-Based Payment Award, Weighted Average Remaining Contractual Life [Abstract] no definition. Total other income, net Nonoperating Income (Expense) One-time milestone payment on achievement of conditions One-Time Milestone Payment On Achievement Of Conditions The one-time milestone payment on achievement of conditions. Asset Acquisition [Table] Asset Acquisition [Table] Schedule of potentially dilutive securities not included in calculation of diluted net loss per share because to do so would be anti-dilutive Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Cash paid for taxes Income Taxes Paid, Net Schedule of Restricted Share Awards Nonvested Restricted Stock Shares Activity [Table Text Block] Collaborative Arrangement and Arrangement Other than Collaborative [Table] Collaborative Arrangement and Arrangement Other than Collaborative [Table] Award Timing Disclosures [Line Items] Granted (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Unallocated research and development expenses Research and Development Expense, Unallocated Expense Research and Development Expense, Unallocated Expense Net loss Net loss Net loss Net Income (Loss) Attributable to Parent Expiration Date Trading Arrangement Expiration Date Other accrued expenses Other Accrued Liabilities, Current Additional product candidates (torudokimab and crebankitug) Additional Product Candidates [Member] Additional Product Candidates Shareholders’ Equity Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Accounts Payable and Accrued Liabilities, Current [Abstract] Accounts Payable and Accrued Liabilities, Current [Abstract] Share based payment award, option to vest (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Property and equipment, net Property, Plant and Equipment, Net Preferred shares authorized (in shares) Preferred Stock, Shares Authorized Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Adoption Date Trading Arrangement Adoption Date Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Entity Current Reporting Status Entity Current Reporting Status Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Loss from operations Operating Income (Loss) Accumulated deficit Accumulated deficit Retained Earnings (Accumulated Deficit) Schedule of Share-Based Compensation Expense Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Loss on disposal of property and equipment Gain (Loss) on Disposition of Property Plant Equipment Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Executive Category: Executive Category [Axis] Class of Stock [Axis] Class of Stock [Axis] Reportable Segment Reportable Segment [Member] Reportable Segment Current Fiscal Year End Date Current Fiscal Year End Date Number of Class A ordinary shares upon exercise of each warrant Class of Warrant or Right, Number of Securities Called by Each Warrant or Right Expected term (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Statement [Table] Statement [Table] Other expense, net Other Nonoperating Income (Expense) Adjustments to reconcile net loss to net cash used in operating activities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Cash flows from financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Weighted average grant date fair value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Adjustments to Additional Paid in Capital, Warrant Issued Adjustments to Additional Paid in Capital, Warrant Issued Number of development and regulatory milestone payments Asset Acquisition, Consideration, Number of Development And Regulatory Milestone Payments Represents the number of development and regulatory milestone payments in asset acquisition. Organization and Description of Business Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Total Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount All Adjustments to Compensation All Adjustments to Compensation [Member] Accounts payable and accrued expenses Total accounts payable and accrued expenses Accounts Payable and Accrued Liabilities, Current Amendment Flag Amendment Flag Sale of stock, price per share (in dollars per share) Sale of Stock, Price Per Share Share-based compensation arrangement by share-based payment award, number of shares authorized Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Termination Date Trading Arrangement Termination Date Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Percentage of shares outstanding immediately prior to or after giving effect to exercise of share exchange Threshold Percentage Of Outstanding Shares Owned The threshold percentage of outstanding shares owned. Significant Accounting Policies Significant of Accounting, Policy [Policy Text Block] Disclosure of accounting policy for significant accounting policies. Schedule of Company's Share Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Weighted-average shares outstanding, basic (in shares) Weighted Average Number of Shares Outstanding, Basic License agreement with Lilly License Agreement with Lilly [Member] Represents the information pertaining to License agreement with Lilly. Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Risk-free rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Entity Tax Identification Number Entity Tax Identification Number Wuxi Biologics License Wuxi Biologics License [Member] Represents information pertaining to Wuxi Biologics License. Asset Acquisition [Axis] Asset Acquisition [Axis] Beginning balance (in dollars per share) Ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Class A ordinary shares, par value per share (in dollars per share) Common Stock, Par or Stated Value Per Share Class A ordinary shares issued (in shares) Common Stock, Shares, Issued Shareholders' Equity Shareholders' Equity [Abstract] No definition available. Number of options granted (in shares) Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Use of Estimates Use of Estimates, Policy [Policy Text Block] Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Insider Trading Arrangements [Line Items] Proceeds from issuance of Pre-Funded Warrants in connection with February 2026 Equity Offering, net of $0.7 million of underwriters’ fees and discounts Proceeds from Issuance of Warrants Security Exchange Name Security Exchange Name Forfeited (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Total liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Purchase of property and equipment included in accounts payable and accrued expenses Capital Expenditures Incurred but Not yet Paid Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Operating expenses: Operating Expenses [Abstract] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Redeemable Noncontrolling Interest Increase (Decrease) in Temporary Equity [Roll Forward] Issuance of Class A ordinary shares (in shares) Stock issued during period, value, new issues (in shares) Stock Issued During Period, Value, New Issues Statement Statement [Line Items] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Counterparty Name [Axis] Counterparty Name [Axis] Schedule of Restricted Share Units Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Class A Ordinary Shares Common Stock [Member] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Accrued professional fees Accrued Professional Fees, Current