75000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 75010 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 75020 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 75030 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 75040 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 75050 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 75060 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 995455 - Disclosure - Nature of Business and Basis of Presentation link:presentationLink link:calculationLink link:definitionLink 995465 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 995475 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 995485 - Disclosure - Property and Equipment, Net link:presentationLink link:calculationLink link:definitionLink 995495 - Disclosure - Accrued Expenses link:presentationLink link:calculationLink link:definitionLink 995505 - Disclosure - Leases link:presentationLink link:calculationLink link:definitionLink 995515 - Disclosure - Related Party Transactions link:presentationLink link:calculationLink link:definitionLink 995525 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 995535 - Disclosure - Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 995545 - Disclosure - Stock-Based Compensation link:presentationLink link:calculationLink link:definitionLink 995555 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 995565 - Disclosure - Segment Reporting link:presentationLink link:calculationLink link:definitionLink 995575 - Disclosure - Subsequent Event link:presentationLink link:calculationLink link:definitionLink 995585 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 995595 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 995605 - Disclosure - Property and Equipment, Net (Tables) link:presentationLink link:calculationLink link:definitionLink 995615 - Disclosure - Accrued Expenses (Tables) link:presentationLink link:calculationLink link:definitionLink 995625 - Disclosure - Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 995635 - Disclosure - Stockholders' Equity (Tables) link:presentationLink link:calculationLink link:definitionLink 995645 - Disclosure - Stock-Based Compensation (Tables) link:presentationLink link:calculationLink link:definitionLink 995655 - Disclosure - Segment Reporting (Tables) link:presentationLink link:calculationLink link:definitionLink 995665 - Disclosure - Nature of Business and Basis of Presentation - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 995675 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 995685 - Disclosure - Fair Value Measurements - Summary of Marketable Securities (Details) link:presentationLink link:calculationLink link:definitionLink 995695 - Disclosure - Fair Value Measurements - Summary of Fair Value of Financial Assets Measured at Fair Value on Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 995705 - Disclosure - Fair Value Measurements - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 995715 - Disclosure - Fair Value Measurements - Summary of Maturity of Company's Marketable Securities (Details) link:presentationLink link:calculationLink link:definitionLink 995725 - Disclosure - Property and Equipment, Net - Summary of Cost and Accumulated Depreciation of Property and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 995735 - Disclosure - Property and Equipment, Net - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 995745 - Disclosure - Accrued Expenses - Schedule of Accrued Expenses (Details) link:presentationLink link:calculationLink link:definitionLink 995755 - Disclosure - Related Party Transactions - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 995765 - Disclosure - Commitments and Contingencies - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 995775 - Disclosure - Stockholders' Equity - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 995785 - Disclosure - Stockholders' Equity - Schedule of Reserved Shares of Common Stock for Issuance, on an As-Converted Basis (Details) link:presentationLink link:calculationLink link:definitionLink 995795 - Disclosure - Stock-Based Compensation - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 995805 - Disclosure - Stock-Based Compensation - Summary of Stock Options Activity (Details) link:presentationLink link:calculationLink link:definitionLink 995815 - Disclosure - Stock-Based Compensation - Summary of Restricted Stock Units (Details) link:presentationLink link:calculationLink link:definitionLink 995825 - Disclosure - Stock-Based Compensation - Summary of Stock-based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 995835 - Disclosure - Income Taxes - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 995845 - Disclosure - Segment Reporting - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 995855 - Disclosure - Segment Reporting - Schedule of Functional Operating Expenses (Details) link:presentationLink link:calculationLink link:definitionLink 995865 - Disclosure - Subsequent Event - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 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, Vested Entity Incorporation, State or Country Code Statement of Financial Position Location, Balance [Domain] Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Supplemental noncash investing and financing activities Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Maturing in one year or less Plan Name [Axis] Research and Development Expense [Abstract] Research and Development Expenses Equity [Abstract] Entity Current Reporting Status Proceeds from the exercise of Series A-2 warrants Proceeds from warrant exercises Proceeds from Warrant Exercises Operating expenses Operating expenses: Operating Expenses [Abstract] Fair Value, Inputs, Level 2 [Member] Level 2 Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Common Stock, Shares Authorized Common stock, shares authorized MASSACHUSETTS Massachusetts Facility Related and Other [Member] Facility related and other. Facility Related and Other Product and Service [Axis] Document Fiscal Period Focus Accounting Standards Update 2023-09 [Member] ASU 2023-09 Entity Shell Company Other Accrued Liabilities, Current Other Dividends, Common Stock, Cash Cash dividend Available For Sale Securities Debt Maturities After One Year Through Two Years Fair Value Available for sale securities debt maturities after one year through two years fair value. Maturing after one year through two years Cash and Cash Equivalents, at Carrying Value, Total Cash and Cash Equivalents, at Carrying Value, Beginning Balance Cash and Cash Equivalents, at Carrying Value, Ending Balance Cash and Cash Equivalent Cash and cash equivalents Subsidiary, Sale of Stock [Line Items] Statement [Table] Restricted Cash, Noncurrent Restricted cash Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted average grant date fair value of options granted Statement [Line Items] Entity Filer Category Total liabilities and stockholders' equity Liabilities and Equity Total liabilities, convertible preferred stock, and stockholders' deficit Payments to Acquire Marketable Securities Purchases of marketable securities Long-Lived Tangible Asset [Axis] Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent, Total Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Cumulative translation adjustment arising during the period Operating Loss Carryforwards [Table] Cash and Cash Equivalents, Fair Value Disclosure Cash Equivalents Shares Issued, Price Per Share Public offering price per share Subsequent Event [Line Items] Computer and office equipment member. Computer And Office Equipment Member Computer and Office Equipment Stock Options Investment Income, Interest Interest income Geographical [Domain] Additional paid-in capital Additional Paid in Capital, Common Stock, Beginning Balance Additional Paid in Capital, Common Stock, Ending Balance Additional Paid in Capital, Common Stock At The Market Issuance Sales Agreement [Member] At the market issuance sales agreement. At-the-Market Equity Offering Sales Agreement Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Property, Plant and Equipment [Line Items] Available For Sale Securities Debt Maturities After Two Years Fair Value Available for sale securities debt maturities after two years fair value. Maturing after two years Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Option to purchase Stock Options, Granted Required to pay exit fee amount. Required to Pay Exit Fee Amount Required to pay exit fee amount Other receivables Increase (Decrease) in Other Receivables Investment, Name [Axis] Investments Classified by Contractual Maturity Date [Table Text Block] Summary Of Maturity Of Company's Marketable Securities Net loss per share, basic Earnings Per Share, Basic Earnings Per Share, Basic, Total Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Foreign currency translation adjustment Cumulative translation adjustment arising during the period Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Stock options repriced Outstanding vested and unvested stock options Stock Options, Outstanding as of March 31, 2026 Stock Options Outstanding as of December 31, 2025 Liabilities, Current Total current liabilities Total current liabilities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Adjustments to reconcile net loss to cash used in operating activities: Percentage of exit fee. Percentage Of Exit Fee Percentage of exit fee Accounting Standards Update [Axis] Undesignated Preferred Stock Undesignated Preferred Stock [Member] Undesignated referred stock. Equity, Attributable to Parent [Abstract] Stockholders' equity Entity Small Business Increase (Decrease) in Accrued Liabilities, Total Increase (Decrease) in Accrued Liabilities Accrued expenses and other non-current liabilities Leased space Leased Space Leased space Retained Earnings (Accumulated Deficit), Total Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit) Accumulated deficit Accumulated deficit Subsidiary or Equity Method Investee, Sale of Stock, Type [Table] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period Stock Options, Forfeited Proceeds from Issuance Initial Public Offering Gross proceeds from sale of shares Issuance of common stock in public offering, net of underwriters' fees Warrants and Rights Outstanding, Measurement Input Expected dividend yield Share-Based Payment Arrangement [Text Block] Stock-Based Compensation Organization, Consolidation and Presentation of Financial Statements [Abstract] Leases [Abstract] Common Class A [Member] Class A Common Stock Lessee, Lease, Description [Line Items] Commitments and contingencies [Line Items] Amendment Flag Product and Service [Domain] Warrants exercised, date Class of Warrant or Right, Date from which Warrants or Rights Exercisable Class of Warrant or Right, Number of Securities Called by Warrants or Rights Number of warrants purchase granted Preferred stock warrants exercised Liabilities and stockholders' equity Liabilities, convertible preferred stock, and stockholders' equity Liabilities and Equity [Abstract] Entity Address, Postal Zip Code Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Net cash used in operating activities Increase (Decrease) in Operating Lease Liability Operating lease liabilities, current and non-current Common Stock Common Stock [Member] Common stock Accounting Standards Update and Change in Accounting Principle [Table] Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Weighted Average Exercise Price, Granted Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less: accumulated depreciation Entity Address, Address Line One Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] Fair Value Hierarchy and NAV [Axis] Preferred Stock Temporary Equity, Carrying Amount, Attributable to Parent Temporary Equity Beginning Balance Temporary Equity Ending Balance Convertible preferred stock Statement of Financial Position Location, Balance [Axis] Operating lease right-of-use asset Operating Lease, Right-of-Use Asset OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax, Total OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Unrealized loss on marketable securities Document Type Income Taxes Paid, Net, Total Income Taxes Paid, Net Cash paid for taxes Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Entity Central Index Key Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Net decrease in cash, cash equivalents and restricted cash Subsequent Event Type [Domain] Impairment of Long-Lived Assets to be Disposed of Impairment of long-lived assets Common Stock, Par or Stated Value Per Share Common stock, par value Accounting Standards Update [Domain] Debt Securities, Available-for-Sale, Amortized Cost Amortized Cost Amortized Cost Debt Securities, Available-for-Sale Total Total Class A and Class B common stock. Class A and Class B Common Stock [Member] Class A and Class B Common Stock Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Stock Options, Exercised Exercise of stock options, Shares Accrued Liabilities, Current Accrued expenses Total accrued expenses Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Current Fiscal Year End Date Document Quarterly Report Fair Value, by Balance Sheet Grouping [Table] Entity Address, State or Province Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Number of shares outstanding Outstanding as of December 31, 2025 Outstanding as of March 31, 2026 Term of license agreement. Term of License Agreement Term of license agreement Other General and Administrative Expenses [Member] Other general and administrative expenses. Other General and Administrative Investment, Name [Domain] Leases Leases Disclosure [Text Block] Leases disclosure. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive loss Accrued expenses. Accrued Expenses [Member] Accrued Expenses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Unrealized Gains Common Stock, Capital Shares Reserved for Future Issuance Initially common stock reserved for future issuance Reserved shares of common stock for issuance Geographical [Axis] Marketable Securities, Current Marketable securities Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Summary of Stock-based Compensation Expense Stock Issued During Period, Value, Stock Options Exercised Exercise of stock options Performance Shares [Member] PSUs Subsequent Event [Member] Subsequent Event Property, Plant and Equipment [Abstract] Other Assets, Noncurrent, Total Other Assets, Noncurrent Other assets Operating Loss Carryforwards [Line Items] Income Taxes [Line Items] Patent Procurement Milestone Payments Patent procurement milestone payments. Patent procurement milestone payments Commission to sales agent for gross proceeds from sales Percentage Of Commission To Sales Agent From Sales Percentage of commission to sales agent from sales. Related Party Transaction [Axis] AOCI Attributable to Parent [Member] Accumulated Other Comprehensive (Loss) Income Other non-cash adjustments Noncash Merger Related Costs Accretion of Discounts on Marketable Securities, Net Accretion of discounts on marketable securities, net. Accretion of discounts on marketable securities, net Additional payments of restatement completion fee and license data fee. Additional Payments of Restatement Completion Fee and License Data Fee Additional payments of restatement completion fee and license data fee Option to extend lease Lessee, Operating Lease, Option to Extend Option to extend lease term description Preferred Stock, Value, Issued Preferred stock Minimum [Member] Minimum 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, Granted Weighted-average grant date fair value, granted Financial Instrument [Axis] Financial Instrument [Axis] Assets, Current [Abstract] Current assets: Fair Value, Inputs, Level 3 [Member] Level 3 Accrued liabilities current disclosure. Accrued liabilities Current Disclosure [Text Block] Accrued Expenses Segment Reporting [Abstract] Fair Value, Assets Measured on Recurring Basis [Table Text Block] Summary of Fair Value of Financial Assets Measured at Fair Value on Recurring Basis Liabilities, Current [Abstract] Current liabilities: Stock Restriction Agreements [Member] Stock Restriction Agreements [Member] Stock Restriction Agreements UK Tax Authorities [Member] UK tax authorities. UK Tax Authorities Related Party Transactions [Abstract] Shares, Outstanding Beginning Balance, shares Ending Balance, shares Renewal period Lessee, Operating Lease, Renewal Term Proceeds from Stock Plans Proceeds from employee equity plans Stock purchase agreement. Stock Purchase Agreement [Member] Stock Purchase Agreement Commitments and Contingencies Commitments and contingencies (Note 7) 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, Issued and unvested Weighted Average Grant Date Fair Value, Issued and unvested General and Administrative Expense [Member] General and Administrative Technology license agreement. Technology License Agreement [Member] Technology License Agreement Increase (Decrease) in Prepaid Expenses, Other Prepaids and other current and non-current assets Service-based RSUs Service Based Restricted Stock Units (Rsu) Member Service based restricted stock units (Rsu). Class of warrants or right activity Class of Warrants or Right Activity Class of warrants or right activity. Lessee, Lease, Description [Table] Payment of offering costs. Payment of Offering Costs Payment of offering costs Offering expenses Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Effect of exchange rate changes on cash Accrued Income Taxes, Current Income tax liabilities Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Basic, Total Weighted-average common stock outstanding, basic Series A-2 convertible preferred stock. Series A-2 Convertible Preferred Stock [Member] Series A-2 Convertible Preferred Stock Segment Reporting, Expense Information Used by CODM, Description Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Long-Lived Tangible Asset [Domain] Subsequent Event Subsequent Events [Text Block] Related Party Transactions Disclosure [Text Block] Related Party Transactions APIC, Share-based Payment Arrangement, Increase for Cost Recognition, Total APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Stock-based compensation expense Equity, Attributable to Parent Total stockholders' deficit Beginning Balance Ending Balance Total stockholders' equity Preferred Stock, Par or Stated Value Per Share Preferred stock par value Lessee, Operating Lease, Existence of Option to Extend [true false] Option to extend lease term Statement of Stockholders' Equity [Abstract] Follow-on offering. Follow-on Offering [Member] Follow-on Offering Unrecognized Tax Benefits Increases Resulting from Dissolution of Subsidiary Unrecognized tax benefits increases resulting from dissolution of subsidiary. Unrecognized tax benefits increases resulting from dissolution of subsidiary Initial monthly lease payments. Initial Monthly Lease Payments Initial monthly lease payments Percentage of lease payments increase on annual basis. Percentage of Lease Payments Increase on Annual Basis Percentage of lease payments increase on annual basis Over-Allotment Option [Member] Underwriters Fair Value Disclosures [Text Block] Fair Value Measurements Underwritten Public Offering [Member] Underwritten public offering 2025 Offering Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] Plan Name [Domain] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Equity Method Investment, Ownership Percentage Percentage of holding in outstanding common stock Award vesting description Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights Related and Nonrelated Parties [Axis] Shares sales agreement and follow-on offering. Shares Sales Agreement and Follow-on Offering [Member] Shares Sales agreement and Follow-on Offering Two thousand twenty four inducement stock incentive plan. Two Thousand Twenty Four Inducement Stock Incentive Plan [Member] 2024 Inducement Plan Entity Address, City or Town Class of warrants or rights number of shares converted to common stock. Class of Warrants or Rights Number of Shares Converted to Common Stock Class of warrants or rights number of shares converted into common stock Series A-1 convertible preferred stock. Series A-1 Convertible Preferred Stock [Member] Series A-1 Convertible Preferred Stock Number of Reportable Segments Number of reportable segment Security Exchange Name Property, Plant and Equipment, Gross, Total Property, Plant and Equipment, Gross, Beginning Balance Property, Plant and Equipment, Gross, Ending Balance Property, Plant and Equipment, Gross Total property and equipment Entity Bankruptcy Proceedings, Reporting Current Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Net loss before income tax Net loss before income tax Measurement Input Type [Domain] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Statistical Measurement [Domain] Assets, Current Total current assets Total current assets Share-Based Payment Arrangement, Expense Stock-based compensation expense Total stock-based compensation expense Document Period End Date Fair Value Hierarchy and NAV [Domain] Accrued Professional Services Current Accrued professional services current. Professional services Statement of Financial Position [Abstract] Restricted Stock Units (RSUs) [Member] Restricted Stock Units Redeemable Convertible Preferred Stock [Member] Redeemable Convertible Preferred Stock Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Other comprehensive loss: Other comprehensive (loss) income: Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation [Abstract] Components of cash, cash equivalents and restricted cash Class of Stock [Axis] Stock Option Repricing [Member] Stock Option Repricing [Member] Stock Option Repricing Total liabilities Liabilities Total liabilities Financial Instruments [Domain] Financial Instrument [Domain] Platform And External [Member] Platform And External. Platform and External Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period Award requisite service period Restricted Cash, Total Restricted Cash Restricted cash Restricted Stock [Member] Restricted Stock and Performance Stock Units Weighted Average Number of Shares Outstanding, Diluted Weighted Average Number of Shares Outstanding, Diluted, Total Weighted-average common stock outstanding, diluted Entity File Number Securities Act File Number OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Unrealized loss on marketable securities Accounting Standards Update 2023-07 [Member] ASU 2023-07 Cover [Abstract] US Treasury Notes Securities [Member] U.S. Treasury Notes Measurement Input Type [Axis] Prepaid Expense and Other Assets, Current Prepaid expenses and other assets Prepaid expenses and other current assets Number of Shares, Forfeited Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Common stock outstanding percentage Common Stock Outstanding Percentage Common stock outstanding percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Number of shares authorized and reserved for issuance Sale of Stock [Domain] Segment Reporting Segment Reporting Disclosure [Text Block] General and Administrative Expense, Total General and Administrative Expense General and administrative General and administrative expenses Subsequent Event [Table] Other Research and Development Expenses [Member] Other research and development expenses. Other Research and Development Expenses New Accounting Pronouncements, Policy [Policy Text Block] Recently Issued Accounting Pronouncements Schedule of Future Minimum Lease Payments Under Non-cancelable Operating Leases Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Series B Stock Purchase Agreement. Series B Stock Purchase Agreement [Member] Series B Stock Purchase Agreement Accrued research and development expenses current Accrued Research And Development Expenses Current Research and development expenses ATM At The Market Sales Agreement [Member] At the market sales agreement. Number of common stock vote. Number of Common Stock Vote Number of common stock vote Depreciation, Total Depreciation Depreciation expense Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Unrecognized compensation costs related to unvested RSUs Lessee, Operating Lease, Term of Contract Lease term Operating lease liability Lease liability Operating Lease, Liability, Current Depreciation, Depletion and Amortization, Total Depreciation, Depletion and Amortization Depreciation expenses Class of warrant or right activity Class of Warrant or Right Activity Class of warrant or right activity. Document Transition Report Total operating expenses Operating Expenses Accrued Liabilities, Current [Abstract] Research and development Research and Development Expense, Total Research and Development Expense Research and development expenses Convertible Preferred Stock [Member] Convertible Preferred Stock Statement of Cash Flows [Abstract] Stock Issued During Period, Value, New Issues Issuance of common stock Issuance of common stock from At-the-Market Sales Agreement, net of underwriters' fees Share-Based Payment Arrangement, Option, Activity [Table Text Block] Summary of Stock Options Activity Equity [Text Block] Stockholders' Equity Measurement Input, Expected Dividend Rate [Member] Dividend Yield Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Summary of Restricted Stock Units Net loss Net loss Warrants and Rights Outstanding, Term Warrants term Assets [Abstract] Assets Income Tax Authority, Name [Axis] Construction in Progress [Member] Construction in Process Document Fiscal Year Focus Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Cash flows from investing activities: Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit Options exercise price, upper limit Accounts payable Accounts Payable, Current, Total Accounts Payable, Current Due to related party for service rendered Stock options issued and outstanding. Stock options issued and outstanding [Member] Stock Options Issued and Outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value Fair value of vested shares Sublicensees threshold amount. Sublicensees Threshold Amount Sublicensees threshold amount Research and Development Expense [Member] Research and Development Non cash Charges Non cash charges. Non-cash charges Accounting Standards Update and Change in Accounting Principle [Abstract] Direct Research and Development Expenses [Member] Direct research and development expenses. Direct Research and Development Expenses Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Commitments and Contingencies Disclosure [Abstract] Share-Based Payment Arrangement [Abstract] Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Unrecognized compensation cost related to unvested share options Assets, Fair Value Disclosure Fair value of financial assets Sale of Stock [Axis] PepGen Limited [Member] PepGen Limited. PepGen Limited Net cash used in investing activities Net cash (used in) provided by investing activities Title of 12(b) Security Schedule of Segment Reporting Information, by Segment [Table] Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Weighted Average Exercise Price, 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, Forfeited Related and Nonrelated Parties [Domain] Income Tax Disclosure [Text Block] Income Taxes PGN-EDODM1 PGN-EDODM1 [Member] PGN-EDODM1. Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Property, Plant and Equipment [Table Text Block] Summary of Cost and Accumulated Depreciation of Property and Equipment Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Exercise price of options repriced Weighted Average Exercise Price, Outstanding as of March 31, 2026 Weighted Average Exercise Price, Outstanding as of December 31, 2025 Deferred offering costs in accounts payable and accrued expenses. Deferred Offering Costs In Accounts Payable And Accrued Expenses Deferred offering costs in accounts payable and accrued expenses Schedule of Accrued Liabilities Current [Table Text Block] Schedule of accrued liabilities current. Schedule of Accrued Expenses Income Tax Disclosure [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Unrecognized Tax Benefits, Beginning Balance Unrecognized Tax Benefits, Ending Balance Unrecognized Tax Benefits Uncertain tax position Additional Paid-in Capital [Member] Additional Paid-in Capital Measurement Frequency [Domain] Statement of Income Location, Balance [Axis] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Change in Accounting Principle, Accounting Standards Update, Adoption Date Trading Symbol Property, Plant and Equipment Disclosure [Text Block] Property and Equipment, Net Related Party Transaction [Table] Subsequent Event Type [Axis] Amortization and Interest Accretion Related to Operating Leases Amortization and interest accretion related to operating leases. Amortization and interest accretion related to operating lease Employee-related Liabilities, Current, Total Employee-related Liabilities, Current Employee-related expenses Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Cash flows from financing activities: Fair Value, Recurring [Member] Fair Value, Measurements, Recurring Entity Ex Transition Period Equity Components [Axis] Nonoperating Income (Expense) Total other income, net Stock Issued During Period Shares Restricted Stock Units Vested Stock issued during period, shares, restricted stock units vested. Vesting of restricted stock units, Shares Equity Component [Domain] IPO [Member] Public Offering IPO Issuance of stock under the employee stock purchase plan, shares Stock Issued During Period, Shares, Employee Stock Purchase Plans US Treasury-backed money market funds. US Treasury-Backed Money Market Funds [Member] US Treasury-Backed Money Market Funds Oxford University Innovation Limited Oxford University Innovation Limited [Member] Oxford University Innovation Limited Maximum Maximum [Member] Statistical Measurement [Axis] Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted Average Exercise Price, Exercised Common stock Common Stock, Value, Issued, Total Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued Expected market return. Expected Market Return Expected market return Equipment [Member] Lab Equipment Related Party Transaction, Amounts of Transaction Rent expense Two thousand twenty four inducement plan. Two Thousand Twenty Four Inducement Plan [Member] 2024 Inducement Plan Shares sales agreement. Shares Sales Agreement [Member] Shares Sales Agreement Preferred Stock, Shares Authorized Preferred stock authorized Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Related Party Transaction [Line Items] Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit Options exercise price, lower limit Entity Registrant Name Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Unrealized Losses Other Nonoperating Income (Expense), Total Other Nonoperating Income (Expense) Other (expense) income, net Subsequent Events [Abstract] Supplemental Disclosure of Cash Flow Information Related to Leases Supplemental Disclosure Of Cash Flow Information Related To Leases [Table Text Block] Supplemental disclosure of cash flow information related to leases Income tax expense Income Tax Expense (Benefit), Total Income Tax Expense (Benefit) Income tax expense Measurement Frequency [Axis] Proceeds from Issuance of Common Stock Issuance and sale of shares of common stock Issuance of common stock from At-the-Market Sales Agreement, net of underwriters' fees Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Entity Common Stock, Shares Outstanding Stock options issued and outstanding under the employee stock purchase plan. Stock Options Issued and Outstanding Under the Employee Stock Purchase Plan [Member] Stock Options Issued and Outstanding Under Employee Stock Purchase Plan Authorized for future stock awards or option grants. Authorized for future stock awards or option grants [Member] Authorized for Future Stock Awards or Option Grants Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated other comprehensive (loss) income Schedule of common stock shares reserved for issuance. Schedule Of Common Stock Shares Reserved For Issuance [Table Text Block] Schedule of Reserved Shares of Common Stock for Issuance, on an As-Converted Basis Stifel, nicolaus and company. Stifel, Nicolaus And Company [Member] Stifel, Nicolaus & Company 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 Number of Shares, Granted Number of shares granted Total assets Assets Total assets Property, Plant and Equipment [Table] Income Statement [Abstract] Issuance of common stock, Shares Number of shares sold Issuance of common stock from At-the-Market Sales Agreement, net of underwriters' fees, Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Number of Shares, Vested Number of Shares, Vested Earnings Per Share, Diluted Net loss per share, diluted Earnings Per Share, Diluted, Total Fair Value, Option, Quantitative Disclosures [Line Items] Fair Value, Option, Quantitative Disclosures [Line Items] Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Functional Operating Expenses Increase (Decrease) in Accounts Payable, Trade Accounts payable City Area Code Research and Development and General and Administrative Expense [Member] Research and development and general and administrative expense. Research and Development and General and Administrative Expense RA Capital Management, L.P. RA Capital Management, L.P. [Member] RA Capital Management, L.P Stock Issued During Period, Value, Employee Stock Purchase Plan Issuance of stock under the employee stock purchase plan Segment Reporting Information [Line Items] 2022 Plan Two Thousand Twenty Two Equity Incentive Award Plan [Member] Two thousand twenty two equity incentive award plan. Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net Property and equipment, net Total property and equipment, net Total property and equipment, net Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Total cash, cash equivalents and restricted cash at end of period Total cash, cash equivalents and restricted cash at end of period Operating Income (Loss) Loss from operations Retained Earnings [Member] Accumulated Deficit Share-based Payment Arrangement, Noncash Expense, Total Share-Based Payment Arrangement, Noncash Expense Stock-based compensation expense Payments of Stock Issuance Costs Net of issuance costs Underwriter's fees and offering costs Property and equipment included in accounts payable and accrued expenses. Property and equipment included in accounts payable and accrued expenses Property and equipment included in accounts payable and accrued expenses Operating lease liability, net of current portion Lease liability, net of current portion Operating Lease, Liability, Noncurrent Fair Value, Inputs, Level 1 [Member] Level 1 Class of Stock [Line Items] Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Components of Lease Cost Lease, Cost [Table Text Block] Change in Accounting Principle, Accounting Standards Update, Adopted [true false] Investments, Fair Value Disclosure, Total Investments, Fair Value Disclosure Marketable Securities Nonoperating Income (Expense) [Abstract] Other income (expense) Other income (expense): Marketable Securities [Table Text Block] Summary of Marketable Securities 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: Convertible Preferred Stock, Shares Issued upon Conversion Shares issued upon conversion of redeemable convertible preferred stock Accretion (Amortization) of Discounts and Premiums, Investments Amortization of premiums and accretion of discounts on marketable securities, net Aggregate potential milestone payments. Aggregate Potential Milestone Payments Aggregate potential milestone payments His Majesty's Revenue and Customs (HMRC) [Member] Her Majesty's Revenue and Customs Entity Tax Identification Number 2022 Employee Stock Purchase Plan Two Thousand Twenty Two Employee Stock Purchase Plan [Member] Two thousand twenty two employee stock purchase plan. Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Maturities of marketable securities Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Nature of Business and Basis of Presentation Income Tax Authority, Name [Domain] Amount of offering, issuance and sale of equity Proceeds from Issuance or Sale of Equity Proceeds from Issuance or Sale of Equity, Total Net proceeds issuance or sale of equity Local Phone Number Personnel-related (Including Stock-based Compensation) Personnel-related (Including Stock-based Compensation) [Member] Personnel-related (including stock-based compensation). Related Party Transaction [Domain] Series B convertible preferred stock. Series B Convertible Preferred Stock [Member] Series B Convertible Preferred Stock Accounting Policies [Abstract] Authorized for Future Issuance under Employee Stock Purchase Plan Authorized for Future Issuance under Employee Stock Purchase Plan [Member] Authorized for future issuance under employee stock purchase plan. General and Administrative Expense [Abstract] General and Administrative Expenses PGN-EDO51 [Member] PGN-EDO51. PGN-EDO51 Class of Stock [Domain] General and Administrative and Research and Development Expense [Member] General and administrative and research and development expense. General and Administrative and Research and Development Expense Shares remaining available for issuance Shares remaining available for grant Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Expected recognition period of unrecognized compensation cost related to unvested share options Cash, Cash Equivalents, and Short-Term Investments, Total Cash, Cash Equivalents, and Short-Term Investments Cash, cash equivalents and marketable securities Stock, Class of Stock [Table] Entity Emerging Growth Company