Summary of Revenue by Geographic Area Disclosure of geographical areas [text block] Other comprehensive loss that may be reclassified to profit or loss in subsequent periods: Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract] Other (expense)/income, net Other Miscellaneous Income (Expense) Other Miscellaneous Income (Expense) Purchase of property, plant and equipment Purchase of property, plant and equipment, classified as investing activities Decrease in other payables and accruals Adjustments for increase (decrease) in other operating payables Novartis Novartis [Member] Novartis Foreign currency translation reserve Reserve of exchange differences on translation [member] Liabilities arising from financing activities [axis] Liabilities arising from financing activities [axis] Disclosure Of Prepayments Other Receivables And Other Assets [Abstract] Disclosure of prepayments, other receivables and other assets. CURRENT LIABILITIES Current liabilities [abstract] Classes of share capital [axis] Classes of share capital [axis] Lease commitment, percentage of future lease payments expected under profit Sharing agreement Lease Commitment, Percentage of Future Lease Payments Expected Under Profit Sharing Agreement Lease Commitment, Percentage of Future Lease Payments Expected Under Profit Sharing Agreement Beginning balance (in shares) Ending balance (in shares) Share Capital And Share Premium Number Of Shares In Issue Share capital and share premium, number of shares in issue. Authorized (in shares) Number of shares authorised EQUITY Equity [abstract] Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Table] Disclosure of disaggregation of revenue from contracts with customers [table] ANALYSIS OF BALANCES OF CASH AND CASH EQUIVALENTS Cash and cash equivalents [abstract] Total equity Beginning balance Ending balance Equity Leases [Table] Leases [Table] Leases table. Interest bearing borrowings, funding advances Interest Bearing Borrowings, Funding Advances Interest Bearing Borrowings, Funding Advances Other comprehensive (loss) income Other comprehensive income [abstract] APPROVAL OF THE INTERIM CONDENSED CONSOLIDATED FINANCIAL STATEMENTS Disclosure of authorisation of financial statements [text block] Property, plant and equipment Property, plant and equipment Disclosure Of Detailed Information About Lease Liabilities [Table] Disclosure Of Detailed Information About Lease Liabilities [Table] Disclosure of detailed information about lease liabilities. Proceeds from exercise of share options Proceeds from exercise of options Summary of Carrying Amounts of The Right-of-use Assets and Movements Disclosure of quantitative information about right-of-use assets [text block] Classes of share capital [domain] Classes of share capital [domain] Disclosure of detailed information about borrowings [abstract] China CHINA Statement of changes in equity [line items] Statement of changes in equity [line items] Prepayments Prepayments Other current liabilities Other current liabilities Basis of Preparation [Abstract] Basis of Preparation [Abstract] Finance income Finance income Interest rate margin percentage Borrowings, adjustment to interest rate basis Additions Additions to right-of-use assets Reclassification of vested restricted share units Increase Decrease Through Reclassification Of Vested Restricted Stock Equity Increase (decrease) through reclassification of vested restricted stock, equity. Accretion of interest recognized during the period Increase Of Lease Liabilities Balance Increase of lease liabilities balance. Decrease in trade receivables Adjustments for decrease (increase) in trade accounts receivable Summary of Movements in the Company's Share Capital and Share Premium Disclosure Of Movements In Company Share Capital And Share Premium Explanatory [Table Text Block] Disclosure of movements in the company's share capital and share premium explanatory. Other assets and liabilities, net Adjustments for Increase (Decrease) In Other Assets and liabilities, Net Adjustments for Increase (Decrease) In Other Assets and liabilities, Net Disclosure of non-adjusting events after reporting period [abstract] Disclosure of non-adjusting events after reporting period [abstract] Other collaboration receivables Other Collaboration Receivables Other Collaboration Receivables Payments Cash outflow for leases Summary of Lease Liabilities Measured at Present Value of Lease Payments to be Made Over Lease Term Lessee Lease Liabilities [Text Block] Lessee lease liabilities text block. Disclosure Of Prepayments Other Receivables And Other Assets [Table] Disclosure Of Prepayments Other Receivables And Other Assets [Table] Disclosure of prepayments, other receivables and other assets. Lease liabilities Carrying amount at January 1, 2026 Carrying amount at March 31, 2026 Carrying amount at March 31, 2026 Lease liabilities Number of countries to receive commerical approval Number Of Countries To Receive Commerical Approval Number Of Countries To Receive Commerical Approval Exchange realignment Increase (Decrease) Through Effect Of Exchange Realignment In Foreign Exchange Rate Increase (decrease) through effect of exchange realignment in foreign exchange rate. Share premium Share premium [member] Statement of financial position [abstract] Decrease in contract liabilities Adjustments for increase (decrease) in contract liabilities Summary of Analysis of Revenue Disclosure of disaggregation of revenue from contracts with customers [text block] Cover [Abstract] Timing of transfer of goods or services [axis] Timing of transfer of goods or services [axis] Prepayments, other receivables and other assets Current prepayments and other current assets Liabilities arising from financing activities [domain] Liabilities arising from financing activities [domain] Revenue Milestone Payment Revenue Milestone Payment [Member] Revenue Milestone Payment TOTAL LIABILITIES Liabilities Total current liabilities Current liabilities Collaboration prepaid leases Collaboration Prepaid Leases Collaboration Prepaid Leases Share capital 371,479,583 and (2025: 369,886,369) ordinary shares of $0.0001 each Issued capital Exercise of share options Increase (decrease) through exercise of options, equity Collaboration inventories, net Total collaboration inventories, net Current inventories Advanced funding principal balance increase (decrease) Interest Bearing Borrowings, Funding Advances, Increase (Decrease) Interest Bearing Borrowings, Funding Advances, Increase (Decrease) Increase/(decrease) in prepayments, other receivables and other assets Adjustments For Decrease Increase In Prepayments Other Receivable Other Assets Adjustments for decrease increase in prepayments other receivable other assets. Timing of transfer of goods or services [domain] Timing of transfer of goods or services [domain] CASH FLOWS FROM FINANCING ACTIVITIES Cash flows from (used in) financing activities [abstract] Other operating expenses Other expense, by function Outside the United States of America Outside the United States of America [Member] Outside the United States of America TOTAL COMPREHENSIVE LOSS Comprehensive income Statement of changes in equity [abstract] Income tax expense Tax expense (income) Schedule of Total Other (Expense) / Income Disclosure Of Detailed Information About Other Income (Expense) [Table Text Block] Disclosure Of Detailed Information About Other Income (Expense) Lease liabilities Lease liabilities [member] SUBSEQUENT EVENT Disclosure of events after reporting period [text block] Work-in-process Current work in progress BASIS OF PREPARATION Disclosure of basis of preparation of financial statements [text block] CASH FLOWS FROM OPERATING ACTIVITIES Cash flows from (used in) operating activities [abstract] Document Fiscal Period Focus Document Fiscal Period Focus TOTAL ASSETS Assets Document Period End Date Document Period End Date Administrative expenses Administrative expenses Non-adjusting events after reporting period [axis] Non-adjusting events after reporting period [axis] Non-adjusting events after reporting period [domain] Non-adjusting events after reporting period [domain] Disclosure Of Classes Of Share Capital [Line Items] Disclosure of classes of share capital [line items] Top of Range Top of range [member] Classes of financial instruments [axis] Classes of financial instruments [axis] Research and development expenses Research and development expense Scenario [Axis] Scenario [Axis] Revenue at a point in time Goods or services transferred at point in time [member] Total Revenue Revenue Geographical [Domain] Geographical [Domain] Document Type Document Type Share-based compensation expense Expense from share-based payment transactions with employees COLLABORATION INTEREST-BEARING ADVANCED FUNDING Disclosure of borrowings [text block] Current finance lease receivables Current finance lease receivables Share capital Number of shares in issue Issued capital [member] Other non-current liabilities Other non-current liabilities Finance income Adjustments for finance income Issued and fully paid (in shares) Number of shares issued and fully paid CORPORATE INFORMATION Disclosure of notes and other explanatory information [text block] The disclosure of notes and other explanatory information as part of a complete set of financial statements. Profit or loss [abstract] Lease liabilities long term Non-current portion Non-current lease liabilities Contract liabilities Current contract liabilities Freehold land Land [member] License and other revenue Revenue From Licensing Of Intellectual Property Revenue From Licensing Of Intellectual Property Share Capital [Roll Forward] Share Capital [Roll Forward] Share Capital Trade payables Trade payables Total revenue Total revenue Revenue from contracts with customers LOSS PER SHARE Loss per share Earnings per share [abstract] Range [axis] Range [axis] Non-cash repayment of collaboration interest-bearing advanced funding Non-Cash Repayment Of Collaboration Interest-Bearing Advanced Funding Non-Cash Repayment Of Collaboration Interest-Bearing Advanced Funding Cash and cash equivalents Cash and cash equivalents at beginning of year CASH AND CASH EQUIVALENTS AT END OF PERIOD Cash and cash equivalents Components of equity [axis] Components of equity [axis] Other non-current assets Other non-current non-financial assets Disclosure of expected impact of initial application of new standards or interpretations [abstract] Reclassification of vesting of restricted share units (in shares) Reclassification Of Vested Restricted Stock Units Number Of Shares In Issue Reclassification of vested restricted stock units, number of shares in issue. Time deposits Time Deposits Times deposits. Geographical [Axis] Geographical [Axis] Disclosure of non-adjusting events after reporting period [line items] Disclosure of non-adjusting events after reporting period [line items] Loss before tax Loss before tax Profit (loss) before tax Other comprehensive income, net of tax Other comprehensive income Related Party Sublicense Related Party Sublicense [Member] Related Party Sublicense Exercise of share option (in shares) Exercise Of Share Option Number Of Shares In Issue Exercise of share option number of shares in issue. Leases [Line Items] Leases [Line Items] Leases line items. Counterparties [domain] Counterparties [domain] Summary of Interest-Bearing Loans and Borrowings Disclosure of detailed information about borrowings [text block] TOTAL LIABILITIES AND SHAREHOLDER'S EQUITY Equity and liabilities United States UNITED STATES Other payables and accruals Other Payables And Accruals Current Other payables and accruals, current. Summary of Shares Disclosure of share capital, reserves and other equity interest [text block] Forecast Forecast [Member] Interest expense on borrowings Interest expense on borrowings CURRENT ASSETS Current assets [abstract] Other current assets Other current assets REVENUE Revenue [abstract] NON-CURRENT ASSETS Non-current assets [abstract] Disclosure of disaggregation of revenue from contracts with customers [abstract] Disclosure of disaggregation of revenue from contracts with customers [abstract] Classes of financial instruments [domain] Classes of financial instruments [domain] Depreciation of property, plant and equipment Adjustments for depreciation expense SUPPLEMENTAL CASH FLOW INFORMATION Supplemental Cash Flow Information [Abstract] Supplemental Cash Flow Information Summary of Inventories Disclosure Of Detailed Information About Inventories Explanatory [Table Text Block] The disclosure of detailed information about inventories. Exchange realignment Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities Ongoing lease payments Ongoing Lease Payments Under The Land Lease Ongoing lease payments under the land lease. Basic (in shares) Weighted average number of ordinary shares used in calculating basic earnings per share Collaboration revenue Collaboration Revenue Collaboration Revenue SHARE CAPITAL AND SHARE PREMIUM Disclosure of classes of share capital [text block] Cash and bank balances Cash Reserves Other reserves Share-based compensation reserves Reserve of share-based payments [member] CASH FLOWS FROM INVESTING ACTIVITIES Cash flows from (used in) investing activities [abstract] Disclosure Of Detailed Information About Lease Liabilities [Line Items] Disclosure Of Detailed Information About Lease Liabilities [Line Items] Disclosure of detailed information about lease liabilities. Finance lease receivables Finance lease receivables Depreciation of right-of-use assets Adjustments For Depreciation Of Right Of Use Assets Adjustments for depreciation of right-of-use assets. Share capital Share Capital [Member] Share capital. Effective interest rate (%) Borrowings, interest rate Net cash provided by/(used in) investing activities Cash flows from (used in) investing activities NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS Increase (decrease) in cash and cash equivalents after effect of exchange rate changes Non-current finance lease receivables Non-current finance lease receivables OTHER (EXPENSE)/INCOME, NET Disclosure of Other Income (Expense), Net [Text Block] Disclosure of Other Income (Expense), Net Inventory reserve Inventory reserve Inventory reserve Equity-settled share-based compensation expense Increase (decrease) through share-based payment transactions, equity Net cash (used in)/provided by financing activities Cash flows from (used in) financing activities Analyzed into: Lease liabilities [abstract] Cost of license and other revenue Cost Of License And Other Revenue Cost Of License And Other Revenue Disclosure Of Classes Of Share Capital [Table] Disclosure of classes of share capital [table] Counterparties [axis] Counterparties [axis] Total non-current assets Non-current assets Exchange differences on translation of foreign operations Exchange differences on translation of foreign operations Other comprehensive income, net of tax, exchange differences on translation of foreign operations 2,000,000,000 ordinary shares of $0.0001 each Authorized Share Capital Authorized share capital. Additions Increase In Lease Liabilities Increase in lease liabilities. Total current assets Current assets Classes of property, plant and equipment [axis] Classes of property, plant and equipment [axis] Foreign currency exchange loss, net Foreign exchange gain (loss) Disclosure of disaggregation of revenue from contracts with customers [line items] Disclosure of disaggregation of revenue from contracts with customers [line items] Classes of property, plant and equipment [domain] Classes of property, plant and equipment [domain] Disclosure of operating segments [table] Disclosure of operating segments [table] Statement of changes in equity [table] Statement of changes in equity [table] Other expense, net Total other expenses, net Other gains (losses) Revenue over time Goods or services transferred over time [member] Decrease in time deposits Decrease In Time Deposits Decrease in time deposits. Cash flows provided by (used in) operations before changes in working capital Cash flows from (used in) operations before changes in working capital Disclosure of classes of share capital [abstract] Cash and cash equivalents as stated in the statement of financial position Cash And Cash Equivalents As Stated In Statement Of Financial Position Cash and cash equivalents as stated in statement of financial position. Effect of foreign exchange rate changes, net Effect of exchange rate changes on cash and cash equivalents Collaboration interest-bearing advanced funding Collaboration Interest-bearing Advanced Funding Current borrowings and current portion of non-current borrowings Cost of collaboration revenue Cost of sales Disclosure of subsidiaries [abstract] Net cash used in operating activities Cash flows from (used in) operating activities Current Fiscal Year End Date Current Fiscal Year End Date Total Prepayments Other Receivables And Other Assets Prepayments, other receivables and other assets. Finished goods Current finished goods Prepayment to collaborator for collaboration assets Prepayment To Collaborator For Collaboration Right Of Use Assets Prepayment To Collaborator For Collaboration Right Of Use Assets NON-CURRENT LIABILITIES Non-current liabilities [abstract] Bottom of Range Bottom of range [member] REVENUE Disclosure of revenue [text block] Document Fiscal Year Focus Document Fiscal Year Focus Adjustments for: Adjustments to reconcile profit (loss) [abstract] Disclosure of non-adjusting events after reporting period [table] Disclosure of non-adjusting events after reporting period [table] Authorized, price per share (in dollars per share) Issued and fully paid, price per share (in dollars per share) Par value per share Net loss Loss for the period Net loss Profit (loss) Other revenue Other revenue Selling and distribution expenses Selling And Distribution Expenses Selling and distribution expenses. Beginning balance Ending balance Share Capital And Share Premium Share capital and share premium. Income tax paid Income taxes paid, classified as operating activities Amendment Flag Amendment Flag Components of equity [domain] Components of equity [domain] Total non-current liabilities Non-current liabilities Outstanding principal balance Interest Bearing Borrowings, Funding Advances, Net of Pre-Tax Profit Receivable Interest Bearing Borrowings, Funding Advances, Net of Pre-Tax Profit Receivable Finance costs Finance costs Disclosure of continuing involvement in derecognised financial assets [line items] Disclosure of continuing involvement in derecognised financial assets [line items] NEW STANDARDS, INTERPRETATIONS AND AMENDMENTS ADOPTED BY THE COMPANY Disclosure of expected impact of initial application of new standards or interpretations [text block] Provision for inventory reserve Adjustments For Inventory Reserve Provision Adjustments For Inventory Reserve Provision Depreciation of right-of-use assets Depreciation, right-of-use assets Summary of Prepayments, Other Receivables and Other Assets Disclosure Of Detailed Information About Prepayments Other Receivables And Other Assets Explanatory [Table Text Block] Disclosure of detailed information about prepayments, other receivables and other assets. Range [domain] Range [domain] Retained accumulated losses Retained earnings [member] Milestone payments recognized as revenue Proceeds from Milestone Payments Milestone payments. (Decrease)/increase in trade payables Adjustments for increase (decrease) in trade and other payables Issued and fully paid: Number of shares issued [abstract] Disclosure Of Prepayments Other Receivables And Other Assets [Line Items] Disclosure Of Prepayments Other Receivables And Other Assets [Line Items] Disclosure of prepayments, other receivables and other assets. VAT recoverable Value added tax receivables Entity Central Index Key Entity Central Index Key Classes of current inventories [abstract] Classes of current inventories [abstract] Scenario [Domain] Scenario [Domain] Lessee, lease terms Lessee Leasing Arrangements Leases Term Lessee leasing arrangements leases term. Ordinary Shares Ordinary shares [member] Trade receivables Current trade receivables Reclassification of vesting of restricted share units Reclassification Of Vested Restricted Stock Units Share Capital And Share Premium Reclassification of vested restricted stock units, share capital and share premium. Disclosure of continuing involvement in derecognised financial assets [table] Disclosure of continuing involvement in derecognised financial assets [table] LOSS PER SHARE Disclosure of earnings per share [text block] Basic earnings per share [abstract] Basic earnings per share [abstract] Disclosure of Other Income and Expense [Abstract] Disclosure of Other Income and Gains COLLABORATION INVENTORIES, NET Disclosure of inventories [text block] Summary of Disclosure of Timing of transfer of Goods or Services Disclosure Of Timing Of Transfer Of Goods Or Services [Table Text Block] Disclosure Of Timing Of Transfer Of Goods Or Services Interest income received Finance income received, classified as operating activities Finance costs Adjustments for finance costs PREPAYMENTS, OTHER RECEIVABLES AND OTHER ASSETS Disclosure Of Prepayments Other Receivables And Other Assets Explanatory [Text Block] Disclosure of prepayments, other receivables and other assets. Tax payable Current tax liabilities Lease liabilities Current portion Current lease liabilities Operating loss Profit (loss) from operating activities Interest accrued on funding advances Interest Bearing Borrowings Funded Interests Accrued Interest bearing borrowings funded interests accrued. Prepayments Other Receivable and Other Assets Prepayments Other Receivables And Other Assets [Member] Prepayments other receivables and other assets., OTHER COMPREHENSIVE LOSS Exchange differences on translation [abstract] Increase/(decrease) in collaboration inventories Adjustments for decrease (increase) in inventories Diluted (in dollars per share) Diluted earnings (loss) per share LEASES Disclosure of leases [text block] Principal portion of lease payments Payments of lease liabilities, classified as financing activities Right-of-use assets Beginning balance Ending balance Right-of-use assets Lease [Abstract] Lease abstract. Other, net Other adjustments to reconcile profit (loss) Less: Pledged deposits Short-term deposits, classified as cash equivalents Summary of Calculations of Basic and Diluted Loss per Share Earnings per share [text block] Janssen Janssen [Member] Janssen Entity Registrant Name Entity Registrant Name Raw materials Current raw materials Time deposits Times Deposits Current And Noncurrent Times deposits current and noncurrent. Basic (in dollars per share) Basic earnings (loss) per share Unrealized foreign currency exchange loss Adjustments for unrealised foreign exchange losses (gains) Exercise of share options Exercise Of Share Option Exercise of share option. Weighted average shares outstanding Weighted average ordinary shares used in calculating basic and diluted earnings per share [abstract] Statement of cash flows [abstract] Authorized: Authorised [Abstract] Authorised. Diluted (in shares) Weighted average number of ordinary shares used in calculating diluted earnings per share License and other revenue - total License and other revenue - total Revenue From Licensing Of Intellectual Property and Other Revenue from licensing of intellectual property. Addition in time deposits Addition In Time Deposits Addition in time deposits.