Basis of Presentation and Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Statistical Measurement [Domain] Statistical Measurement [Domain] Recapitalization exchange ratio Recapitalization Exchange Ratio Recapitalization Exchange Ratio Award Timing Predetermined Award Timing Predetermined [Flag] 2026 (remainder of the year) Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Net loss per share attributable to Series A non-voting convertible preferred shareholders, diluted (in dollars per share) Loss Per Share, Diluted (in dollars per share) Undistributed Earnings (Loss) Allocated To Participating Securities Per Share, Diluted Undistributed Earnings (Loss) Allocated To Participating Securities Per Share, Diluted Entity File Number Entity File Number Additional Paid-in Capital Additional Paid-in Capital [Member] Tabular List, Table Tabular List [Table Text Block] Leases [Abstract] Paragon Option Agreements Paragon Option Agreements [Member] Paragon Option Agreements Recently Issued Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Accounts payable Increase (Decrease) in Accounts Payable License License [Member] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Warrants outstanding (in shares) Class of Warrant or Right, Outstanding Adjustment to Compensation: Adjustment to Compensation [Axis] Related Party Transactions Related Party Transactions Disclosure [Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Common stock reserved for issuance of conversion shares (in shares) Common Stock, Capital Shares Reserved for Future Issuance Stock, Class of Stock [Table] Stock, Class of Stock [Table] Automatic stock plan increase, percent of diluted stock Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Additional Shares Authorized, Annual Percentage Increase Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Additional Shares Authorized, Annual Percentage Increase Schedule of segment loss, including significant segment expenses Schedule of Segment Reporting Information, by Segment [Table Text Block] Shares issued during period (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Schedule of cash and cash equivalents Schedule of Cash and Cash Equivalents [Table Text Block] Area of office space (in sqft) Area of Real Estate Property Adjustment to Compensation, Amount Adjustment to Compensation Amount Other assets Increase (Decrease) in Other Operating Assets Share-based compensation expense Share-Based Payment Arrangement, Noncash Expense Weighted-average ordinary shares outstanding used in computing net loss per share to ordinary shareholders, basic (in shares) Weighted Average Shares Outstanding, Basic (in shares) Weighted Average Number of Shares Outstanding Available To Common Stockholders, Basic Weighted Average Number of Shares Outstanding Available To Common Stockholders, Basic Milestone and license fees Milestone And License Fees Milestone And License Fees Stock options Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Proceeds from sale of rights to intellectual property Proceeds from Sale of Productive Assets Research and Development Contract Costs Accruals and Costs Research and Development Expense, Policy [Policy Text Block] Convertible preferred stock, conversion ratio Preferred Stock, Convertible, Conversion Ratio Antidilutive Securities [Axis] Antidilutive Securities [Axis] Option agreement, termination period Option Agreement, Termination Period Option Agreement, Termination Period Total shareholders' equity Beginning balance Ending balance Equity, Attributable to Parent Insider Trading Policies and Procedures [Line Items] Share-based compensation expense Total share-based compensation expense Share-Based Payment Arrangement, Expense Common stock, authorized (in shares) Common Stock, Shares Authorized Current assets: Assets, Current [Abstract] Total liabilities, convertible preferred shares, and shareholders’ equity Liabilities and Equity Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] 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] Liabilities, Convertible Preferred Shares, and Shareholders’ Equity Liabilities and Equity [Abstract] Other income (expense): Other Nonoperating Income (Expense) [Abstract] Cover [Abstract] Maximum Maximum [Member] General and administrative General and Administrative Expense [Member] Exercisable (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Debt instrument, increase limit Debt Instrument, Accordion Feature, Increase Limit Debt Instrument, Accordion Feature, Increase Limit Accounting Policies [Abstract] Parascent Holding LLC Parascent Holding LLC [Member] Parascent Holding LLC Schedule of total remaining operating lease payments Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] License Agreements Asset Acquisition [Text Block] Restricted Stock Outstanding unvested restricted stock awards Restricted Stock [Member] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of RSU and RSA activity Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Fair value of shares vested Fair value of shares vested (less than for the three months ended March 31, 2026) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value 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] Total present value of operating lease liability Operating Lease, Liability 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] Entity Shell Company Entity Shell Company Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Accrued withholding taxes Accrual for Taxes Other than Income Taxes, Current Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Statement of Stockholders' Equity [Abstract] Remaining lease term Lessee, Operating Lease, Remaining Lease Term Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount 2029 Lessee, Operating Lease, Liability, to be Paid, Year Three Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Net loss and comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Interest income Investment Income, Nonoperating Schedule of Other Current Assets Schedule of Other Current Assets [Table Text Block] Name Measure Name Schedule of share-based compensation expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Operating lease liability, current Operating Lease, Liability, Current Prepaid research and development services Prepaid Research And Development Expense, Current Prepaid Research And Development Expense, Current Schedule of changes in fair value for warrant liability Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Class of Stock [Line Items] Class of Stock [Line Items] Document Fiscal Period Focus Document Fiscal Period Focus Weighted-average ordinary shares outstanding used in computing net loss per share to ordinary shareholders, diluted (in shares) Weighted Average Shares Outstanding, Diluted (in shares) Weighted Average Number of Shares Outstanding Available To Common Stockholders, Diluted Weighted Average Number of Shares Outstanding Available To Common Stockholders, Diluted Development milestone payment Asset Acquisition, Development Milestone Payments, Maximum Asset Acquisition, Development Milestone Payments, Maximum Award Timing Method Award Timing Method [Text Block] Restriction period Asset Acquisition, License Agreement, Restriction Period Asset Acquisition, License Agreement, Restriction Period Award Type Award Type [Axis] Legal Entity [Axis] Legal Entity [Axis] Total assets Assets Trading Symbol Trading Symbol Number of employees overseeing and coordinating the project Asset Acquisition, Number Of Employees Overseeing And Coordinating Research Project Asset Acquisition, Number Of Employees Overseeing And Coordinating Research Project Vested (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 Geographical [Domain] Geographical [Domain] Deferred financing costs included in accounts payable and accrued expenses Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction 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] Combination study approval payment Contract With Customer, Collaborative Arrangement, Combination Study Approval Payment Contract With Customer, Collaborative Arrangement, Combination Study Approval Payment Schedule of expenses related to development costs Research and Development Arrangement, Contract to Perform for Others [Table Text Block] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Statement of Income Location, Balance [Domain] Statement of Income Location, Balance [Domain] Restricted Stock Units (RSUs) RSUs Outstanding unvested restricted stock units Restricted Stock Units (RSUs) [Member] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Emerging Growth Company Entity Emerging Growth Company Warrant Warrant [Member] Purchase of research and development license Payments to Acquire Intangible Assets Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Vesting of early exercised stock options Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Beginning balance outstanding (in shares) Ending balance outstanding (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] Related Party Related Party [Member] Common stock, outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Plan Name [Axis] Plan Name [Axis] PEO PEO [Member] Supplemental disclosure of non-cash operating and financing activities: Noncash Investing and Financing Items [Abstract] Low-single digits to low-double digits royalty payment, period Asset Acquisition, Sale Based Milestone Payment, Low-Single Digits To Low-Double Digits Royalty Payment, Period Asset Acquisition, Sale Based Milestone Payment, Low-Single Digits To Low-Double Digits Royalty Payment, Period 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 Accumulated Deficit Retained Earnings [Member] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Percent of net sales, royalty payment (less than) Option Agreement, Royalty Payment, Percent Of Net Sales Option Agreement, Royalty Payment, Percent Of Net Sales Number of RSUs Number of RSAs Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Schedule of accrued expenses and other current liabilities Schedule of Accrued Liabilities [Table Text Block] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Weighted-average number of shares of as-converted (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock Share-Based Payment Arrangement [Abstract] 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 shown in the statements of cash flows Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income tax provision Income Tax Expense (Benefit) 2025 Employment Inducement Incentive Award Plan 2025 Employment Inducement Incentive Award Plan [Member] 2025 Employment Inducement Incentive Award Plan Sale of Stock [Domain] Sale of Stock [Domain] Issuance of convertible preferred stock Temporary Equity, Stock Issued During Period, Value, New Issues Convertible Notes Payable Convertible Notes Payable [Member] Preferred stock, stock issued (in shares) Preferred Shares Issued (in shares) Preferred Stock, Shares Issued 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] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Convertible Note Purchase Agreement Convertible Note Purchase Agreement [Member] Convertible Note Purchase Agreement Organization, Consolidation and Presentation of Financial Statements [Abstract] Indemnification Agreement Indemnification Agreement [Member] Personnel costs Personnel Costs Personnel Costs Convertible Preferred Stock Series Seed Convertible Preferred Stock Series Seed Convertible Preferred Stock [Member] Series Seed Convertible Preferred Stock Non-cash lease expense Operating Lease, Right-of-Use Asset, Periodic Reduction Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Proceeds from early exercise of options Proceeds from Stock Options Exercised Paragon accrued research and development Accrued Research And Development [Member] Accrued Research And Development City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Termination period due to breach of contract Asset Acquisition, Option Agreement Termination Period, Breach Of Contract Asset Acquisition, Option Agreement Termination Period, Breach Of Contract 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] Vested and expected to vest weighted average remaining contractual term Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Total accrued expenses and other current liabilities Accrued Liabilities, Current Commitments and Contingencies Commitments and Contingencies, Policy [Policy Text Block] Issuance of warrant Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Pre-Merger Sale of Common Stock and Warrants Pre-Merger Sale Of Common Stock And Warrants [Member] Pre-Merger Sale Of Common Stock And Warrants Unvested beginning balance (in shares) Unvested 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] Crescent Biopharma Crescent Biopharma [Member] Crescent Biopharma Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] General and administrative General and administrative expense General and Administrative Expense Unrecognized compensation cost, stock options 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 used for operating activity Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Related Party Transactions [Abstract] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Subsequent Event Subsequent Event [Member] Schedule of weighted-average assumptions Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Maximum percentage ownership after exercise Class Of Warrant Or Right, Exercisable Condition, Maximum Percentage Ownership After Exercise Class Of Warrant Or Right, Exercisable Condition, Maximum Percentage Ownership After Exercise Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Number of votes Asset Acquisition, Number Of Votes, Option Agreement Asset Acquisition, Number Of Votes, Option Agreement Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Depreciation expense Depreciation Vested and expected to vest (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Money market funds Money Market Funds [Member] Other prepaid expenses and other current assets Other Prepaid Expenses And Other Current Assets Other Prepaid Expenses And Other Current Assets Research and Development, Contract to Perform for Others [Table] Research and Development, Contract to Perform for Others [Table] Equity Components [Axis] Equity Components [Axis] Non-refundable milestone payments Asset Acquisition, Maximum Aggregate Milestone Payments Asset Acquisition, Maximum Aggregate Milestone Payments Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of reportable segments Number of Reportable Segments Other Performance Measure, Amount Other Performance Measure, Amount Weighted Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Schedule of cash and restricted cash Restrictions on Cash and Cash Equivalents [Table Text Block] Payment of debt issuance costs Debt issuance costs (less than) Payments of Debt Issuance Costs Entity Address, State or Province Entity Address, State or Province Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Related and Nonrelated Parties [Domain] Related and Nonrelated Parties [Domain] Total current liabilities Liabilities, Current Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Release of restricted stock units (in shares) Shares issued (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Individual: Individual [Axis] Expense related to 401(k) Plan match contributions Defined Contribution Plan, Cost Vesting [Axis] Vesting [Axis] Restricted cash Restricted Cash Total prepaid expenses and other current assets Other Assets, Current Research and development Research and Development Expense [Member] Entity [Domain] Entity [Domain] 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] Cell Line License Agreement Cell Line License Agreement [Member] Cell Line License Agreement Accrued interest Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Research and Development Arrangement, Contract to Perform for Others, Type [Axis] Research and Development Arrangement, Contract to Perform for Others, Type [Axis] Project [Domain] Project [Domain] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Plan Name [Domain] Plan Name [Domain] Unrecognized compensation cost, weighted average period of recognition Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Weighted-average Series A non-voting convertible preferred shares outstanding used in computing net loss per share to Series A non-voting convertible preferred shareholders, diluted (in shares) Weighted Average Shares Outstanding, Diluted (in shares) Weighted Average Number of Shares Outstanding Allocated To Participating Securities, Diluted Weighted Average Number of Shares Outstanding Allocated To Participating Securities, Diluted Early exercise of stock options (in shares) Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Equity [Abstract] Exercisable aggregate intrinsic value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Building Building [Member] Stock converted (in shares) Stock Converted, Reverse Recapitalization Stock Converted, Reverse Recapitalization Segment Reporting Segment Reporting Disclosure [Text Block] Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Net loss per share attributable to ordinary shareholders, basic (in dollars per share) Loss Per Share, Basic (in dollars per share) Net Income (Loss) Available To Common Stockholders Per Share, Basic Net Income (Loss) Available To Common Stockholders Per Share, Basic Ownership [Domain] Ownership [Domain] Option agreement termination period, maximum contractual period Asset Acquisition, Option Agreement Termination Period, Maximum Contractual Period Asset Acquisition, Option Agreement Termination Period, Maximum Contractual Period Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Net loss per share attributable to ordinary shareholders, diluted (in dollars per share) Loss Per Share, Diluted (in dollars per share) Net Income (Loss) Available To Common Stockholders Per Share, Diluted Net Income (Loss) Available To Common Stockholders Per Share, Diluted Other assets Other Assets, Noncurrent Entity Central Index Key Entity Central Index Key PEO Name PEO Name Consideration received 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 Financial liability (less than) Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Tranche One Share-Based Payment Arrangement, Tranche One [Member] Deferred revenue Deferred revenue, current Contract with Customer, Liability, Current Segments [Axis] Segments [Axis] Estimated purchase price warrants (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Beginning balance, Convertible Preferred Stock Ending balance, Convertible Preferred Stock Temporary Equity, Carrying Amount, Attributable to Parent Exercise Price Award Exercise Price Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Local Phone Number Local Phone Number 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] Unrecognized compensation cost, other awards Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Subsequent Event Type [Axis] Subsequent Event Type [Axis] Assets Assets [Abstract] Nonrelated Party Nonrelated Party [Member] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Statement of Financial Position Location, Balance [Axis] Statement of Financial Position Location, Balance [Axis] Class of Warrant or Right [Domain] Class of Warrant or Right [Domain] Vesting [Domain] Vesting [Domain] Debt Instrument [Axis] Debt Instrument [Axis] Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Fair Value of Financial Instruments 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] Entity Address, Address Line One Entity Address, Address Line One Deferred revenue Deferred Revenue Research and development Research and development expense Research and Development Expense Accrue interest rate Debt Instrument, Interest Rate, Stated Percentage Accrued expenses and other current liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Operating lease liability, noncurrent Operating Lease, Liability, Noncurrent Number of exercisable shares (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Ownership [Axis] Ownership [Axis] Aggregate gross proceeds Sale of Stock, Consideration Received Per Transaction Accrued research and development Accrued Research And Development, Current Accrued Research And Development, Current Fair Value as of Grant Date Award Grant Date Fair Value Registrant Name Entity Registrant Name Collaborative Arrangement Collaborative Arrangement [Member] Operating lease, discount rate Lessee, Operating Lease, Discount Rate Beginning balance, Convertible Preferred Stock (in shares) Ending balance, Convertible Preferred Stock (in shares) Temporary Equity, Shares Outstanding Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Non-cash interest expense Interest Expense, Other Convertible preferred stock, issued (in shares) Temporary Equity, Stock Issued During Period, Shares, New Issues Temporary Equity, Stock Issued During Period, Shares, New Issues RSUs granted in shares) Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Related Party Transaction [Line Items] Related Party Transaction [Line Items] Document Quarterly Report Document Quarterly Report Total Assets Assets, Fair Value Disclosure Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Counterparty Name [Domain] Counterparty Name [Domain] 2028 Lessee, Operating Lease, Liability, to be Paid, Year Two Warrants converted (in shares) Warrants Converted, Reverse Recapitalization Warrants Converted, Reverse Recapitalization Stock split, conversion ratio Stockholders' Equity Note, Stock Split, Conversion Ratio Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Weighted average remaining contractual term Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Schedule of related party accounts payable and other current liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Weighted average grant date fair value (in dollars per share) Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Axis] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount 2024 Equity Incentive Plan 2024 Equity Incentive Plan [Member] 2024 Equity Incentive Plan Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Restatement Determination Date: Restatement Determination Date [Axis] Kelun-Biotech Kelun-Biotech [Member] Kelun-Biotech Non-PEO NEO Non-PEO NEO [Member] Beginning balance outstanding aggregate intrinsic value Ending balance outstanding aggregate intrinsic value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Payment of deferred offering costs Payment Of Deferred Offering Costs Payment Of Deferred Offering Costs Sale of Stock [Axis] Sale of Stock [Axis] Accrued expenses and other current liabilities Accrued Expenses And Other Accrued Liabilities, Current Accrued Expenses And Other Accrued Liabilities, Current Name Trading Arrangement, Individual Name All Award Types Award Type [Domain] 2027 Lessee, Operating Lease, Liability, to be Paid, Year One Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Compensation Amount Outstanding Recovery Compensation Amount Convertible notes payable Debt Instrument, Face Amount Schedule of fair value of warrants Share-Based Payment Arrangement, Activity [Table Text Block] Losses incurred to date Loss Contingency, Losses Incurred To Date Loss Contingency, Losses Incurred To Date Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Operating costs and expenses, total Operating Costs and Expenses Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Contract with customer, liability, revenue recognized Contract with Customer, Liability, Revenue Recognized Reportable Segment Reportable Segment [Member] Reportable Segment Non-Voting Preferred Shares Preferred Stock [Member] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name Ownership percentage (less than for Paragon and Parascent, and more than for Fairmount) (in percent) Equity Ownership, Excluding Consolidated Entity and Equity Method Investee, Percentage Unvested beginning balance (in dollars per share) Unvested ending balance (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 Restricted cash Restricted Cash, Noncurrent Prepaid Expenses and Other Current Assets Other Assets Disclosure [Text Block] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] ESPP Employee Stock [Member] Asset Acquisition [Line Items] Asset Acquisition [Line Items] Percent reduction to royalty payment due to invalid patent Asset Acquisition, Royalty Percent Paid, Reduction Due To Invalid Patent Asset Acquisition, Royalty Percent Paid, Reduction Due To Invalid Patent Stock-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Discovery external research and development costs Discovery External Research And Development Costs [Member] Discovery External Research And Development Costs Pre-Funded Warrant Pre-Funded Warrant [Member] Pre-Funded Warrant Vested and expected to vest aggregate intrinsic value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Liability Class [Axis] Liability Class [Axis] Segments [Domain] Segments [Domain] Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Axis] Sublicense agreement period Asset Acquisition, Option Agreement Sublicense Agreement Period Asset Acquisition, Option Agreement Sublicense Agreement Period Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] SKB105 SKB105 [Member] SKB105 Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Statement of Financial Position Location, Balance [Domain] Statement of Financial Position Location, Balance [Domain] Warrants, exercisable (in shares) Class of Warrant or Right, Number of Securities Called by Warrants or Rights Company Selected Measure Name Company Selected Measure Name PIPE Financing PIPE Financing [Member] PIPE Financing Convertible Notes Payable Debt Disclosure [Text Block] Non-voting convertible preferred shares, $0.001 par value; 5,000,000 shares authorized as of March 31, 2026 and December 31, 2025; 2,890 Series A designated shares issued and outstanding as of March 31, 2026 and December 31, 2025 Carrying Value Preferred Stock, Value, Issued Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable, Current Interest payable Interest Payable Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Loss Allocation, Diluted Net Income (Loss) Available to Common Stockholders, Diluted All Executive Categories All Executive Categories [Member] Ordinary shares, $0.001 par value; 175,000,000 shares authorized as of March 31, 2026 and December 31, 2025, 27,571,935 and 27,556,767 shares issued and outstanding as of March 31, 2026 and December 31, 2025, respectively Common Stock, Value, Issued Loss Allocation, Basic Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Warrants exercised (in shares) Class Of Warrant Or Right, Exercised Class Of Warrant Or Right, Exercised Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Tranche Two Share-Based Payment Arrangement, Tranche Two [Member] Commitments and contingencies (Note 13) Commitments and Contingencies Liquidation Preference Preferred Stock, Liquidation Preference, Value Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Preferred stock, stock outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Preferred Shares Outstanding (in shares) Preferred Stock, Shares Outstanding Document Transition Report Document Transition Report Underlying Securities Award Underlying Securities Amount Percent of outstanding shares Class Of Warrants Or Rights, Percent Of Outstanding Shares Class Of Warrants Or Rights, Percent Of Outstanding Shares Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Project [Axis] Project [Axis] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Forfeited and expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period Income Taxes Income Tax Disclosure [Text Block] Research and Development Arrangement, Contract to Perform for Others [Line Items] Research and Development Arrangement, Contract to Perform for Others [Line Items] Common stock, number of votes Common Stock, Number Of Votes Common Stock, Number Of Votes Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Scenario [Axis] Scenario [Axis] Exercisable weighted average remaining contractual term Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Operating lease liability Increase (Decrease) in Operating Lease Liability Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Net Loss per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Loss Contingencies [Table] Loss Contingencies [Table] Additional paid-in capital Additional Paid in Capital Related party accounts payable and other current liabilities Accounts payable and other current liabilities Accounts Payable and Other Accrued Liabilities, Current Product and Service [Axis] Product and Service [Axis] License agreement revenue License revenue Revenue from Contract with Customer, Excluding Assessed Tax All Individuals All Individuals [Member] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Consideration transferred Asset Acquisition, Consideration Transferred Vested and expected to vest (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Name Forgone Recovery, Individual Name Award expiration period 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] Forfeited and expired (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Loss contingency liability Loss Contingency Accrual Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Loss Allocation, Basic Net Income (Loss) Available to Common Stockholders, Basic Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Contract with customer, refund liability Contract with Customer, Refund Liability Current liabilities Liabilities, Current [Abstract] Stock Options, Additional Disclosures Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] Geographical [Axis] Geographical [Axis] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Total operating expenses Operating Expenses Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Level 1 Fair Value, Inputs, Level 1 [Member] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] License Agreement [Axis] License Agreement [Axis] License Agreement Related Party Transaction [Table] Related Party Transaction [Table] Forecast Forecast [Member] Percent of outstanding common stock, on a fully diluted basis Class Of Warrants Or Rights, Percent Of Outstanding Shares, Fully Diluted Basis Class Of Warrants Or Rights, Percent Of Outstanding Shares, Fully Diluted Basis Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Option agreement termination period due to breach of contract Option Agreement, Termination Period, Breach Of Contract Option Agreement, Termination Period, Breach Of Contract Title of 12(b) Security Title of 12(b) Security Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Ordinary Shares Issuable Upon Conversion (in shares) Preferred Stock, Convertible, Shares Issuable Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] CR-002 CR-002 external research and development costs CR-002 [Member] CR-002 Number of shares issued and sold (in shares) Sale of Stock, Number of Shares Issued in Transaction Earnings Per Share [Abstract] Vesting of early exercised stock options APIC, Share-Based Payment Arrangement, Option, Increase for Cost Recognition Shares issued upon conversion (in shares) Conversion of Stock, Shares Converted Other expense (income) Nonoperating Income (Expense) Net loss per share attributable to Series A non-voting convertible preferred shareholders, basic (in dollars per share) Loss Per Share, Basic (in dollars per share) Undistributed Earnings (Loss) Allocated To Participating Securities Per Share, Basic Undistributed Earnings (Loss) Allocated To Participating Securities Per Share, Basic Asset Acquisition [Table] Asset Acquisition [Table] Schedule of anti-dilutive net loss per share attributable to ordinary shareholders Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Deferred revenue Increase (Decrease) in Contract with Customer, Liability Accrued Expenses and Other Current Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price WuXi Biologics Ireland Limited WuXi Biologics Ireland Limited [Member] WuXi Biologics Ireland Limited Award Timing Disclosures [Line Items] Loss Allocation, Diluted Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted Consideration transfer, period Contract With Customer, Collaborative Arrangement, Consideration Transferred, Period Contract With Customer, Collaborative Arrangement, Consideration Transferred, Period Paragon Therapeutics Paragon Therapeutics [Member] Paragon Therapeutics Granted (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Schedule of convertible preferred stock Schedule of Conversions of Stock [Table Text Block] Accrued employee compensation and benefits Employee-related Liabilities, Current Option agreement termination period due to failure to pay Option Agreement, Termination Period, Failure To Pay Option Agreement, Termination Period, Failure To Pay Total undiscounted lease payments Lessee, Operating Lease, Liability, to be Paid Share-Based Compensation Equity [Text Block] Net loss and comprehensive loss Net loss Net loss Net income (loss) attributable to parent Net Income (Loss) Attributable to Parent Subsequent Event [Table] Subsequent Event [Table] Expiration Date Trading Arrangement Expiration Date Long term liabilities Liabilities, Noncurrent [Abstract] Shareholders’ equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Property and equipment, net Property, Plant and Equipment, Net Percent of award vesting rights Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Rights, Quarterly Percentage, Remainder Of Period Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Rights, Quarterly Percentage, Remainder Of Period Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Preferred stock, stock authorized (in shares) Preferred Shares Authorized (in shares) Preferred Stock, Shares Authorized Adoption Date Trading Arrangement Adoption Date Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Accounts receivable Increase (Decrease) in Accounts Receivable Non-Voting Preferred Shares Series A Preferred Stock Series A Preferred Stock [Member] Entity Current Reporting Status Entity Current Reporting Status Lease term Lessee, Operating Lease, Term of Contract 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) Sale based milestone payment Asset Acquisition, Sales-Based Milestone Payments, Maximum Asset Acquisition, Sales-Based Milestone Payments, Maximum 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] Related party accounts payable and other current liabilities Increase (Decrease) in Accounts Payable and Other Operating Liabilities Mid-single digits to low-double digits royalty payment, period Asset Acquisition, Sale Based Milestone Payment, Mid-Single Digits To Low-Double Digits Royalty Payment, Period Asset Acquisition, Sale Based Milestone Payment, Mid-Single Digits To Low-Double Digits Royalty Payment, Period Waltham, Massachusetts Waltham, Massachusetts [Member] Waltham, Massachusetts 2025 Employee Stock Purchase Plan 2025 Employee Stock Purchase Plan [Member] 2025 Employee Stock Purchase Plan Class of Stock [Axis] Class of Stock [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Subsequent Event Type [Domain] Subsequent Event Type [Domain] 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] Convertible preferred stock (as converted to common stock) Convertible Preferred Stock [Member] Payables and Accruals [Abstract] Professional and other fees Professional Fees 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] Number of shares available for future awards (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Total other income (expense) Other Nonoperating Income (Expense) Statement [Table] Statement [Table] 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 of stock options granted (in dollars per share) 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] Issuance of Parascent warrants Adjustments to Additional Paid in Capital, Warrant Issued Contract with customer, liability Contract with Customer, Liability Schedule of financial assets carried at fair value Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Nature of the Business Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Cash and Cash Equivalents [Abstract] Antidilutive securities Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag Estimated purchase price (in dollars per share) Sale of Stock, Price Per Share Number of shares authorized for issuance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Leases Lessee, Operating Leases [Text Block] Termination Date Trading Arrangement Termination Date Net cash used in 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] Fairmount Healthcare Fund II L.P. Fairmount Healthcare Fund II L.P. [Member] Fairmount Healthcare Fund II L.P. Schedule of stock option activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Schedule of basic and diluted net loss per share attributable to ordinary shareholders Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Exercisable (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Subsequent Events [Abstract] Segment Reporting [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Risk-free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Notice period Sale Of Stock, Percentage Of Ownership After Transaction, Notice Period Sale Of Stock, Percentage Of Ownership After Transaction, Notice Period Entity Tax Identification Number Entity Tax Identification Number Scenario [Domain] Scenario [Domain] Maximum percentage ownership after exercise, upon 61 days notice Class Of Warrant Or Right, Exercisable Condition, Maximum Percentage Ownership After Exercise, Upon 61 Days Notice Class Of Warrant Or Right, Exercisable Condition, Maximum Percentage Ownership After Exercise, Upon 61 Days Notice Paragon accrued general and administrative Accrued General And Administrative [Member] Accrued General And Administrative Fair Value Disclosure of Asset and Liability Not Measured at Fair Value [Table] Fair Value Disclosure of Asset and Liability Not Measured at Fair Value [Table] Beginning balance outstanding (in dollars per share) Ending balance outstanding (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 Arrangement by Share-Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Parascent Warrant Parascent Warrant [Member] Parascent Warrant Common stock, issued (in shares) Common Stock, Shares, Issued Restricted Cash Cash and Cash Equivalents Disclosure [Text Block] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross License Agreement Terms License Agreement Terms [Member] Convertible Preferred Shares and Shareholders' Equity (Deficit) Convertible Preferred Shares And Shareholders' Equity (Deficit) [Text Block] Convertible Preferred Shares And Shareholders' Equity (Deficit) Use of Estimates Use of Estimates, Policy [Policy Text Block] Interest expense Interest expense Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Loss Contingencies [Line Items] Loss Contingencies [Line Items] License Agreement [Domain] License Agreement [Domain] License Agreement [Domain] Change in fair value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Subsequent Events Subsequent Events [Text Block] Weighted-average Series A non-voting convertible preferred shares outstanding used in computing net loss per share to Series A non-voting convertible preferred shareholders, basic (in shares) Weighted Average Shares Outstanding, Basic (in shares) Weighted Average Number of Shares Outstanding Allocated To Participating Securities, Basic Weighted Average Number of Shares Outstanding Allocated To Participating Securities, Basic Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Total liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Development milestone payments Contract With Customer, Collaborative Arrangement, Development Milestone Payments, Maximum Contract With Customer, Collaborative Arrangement, Development Milestone Payments, Maximum Milestone payment Asset Acquisition, Maximum Aggregate, Milestone Payments 1 Asset Acquisition, Maximum Aggregate, Milestone Payments 1 Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Debt instrument, higher borrowing capacity option Debt Instrument, Accordion Feature, Higher Borrowing Capacity Option Debt Instrument, Accordion Feature, Higher Borrowing Capacity Option Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] CR-001 CR-001 external research and development costs CR-001 [Member] CR-001 Operating Expenses [Abstract] Operating Expenses [Abstract] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] 2025 Stock Incentive Plan 2025 Stock Incentive Plan [Member] 2025 Stock Incentive Plan Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Convertible preferred stock, purchase price (in dollars per share) Temporary Equity, Stock Issued During Period, Value, New Issues, Price Per Share Temporary Equity, Stock Issued During Period, Value, New Issues, Price Per Share Statement [Line Items] Statement [Line Items] Deposit liability Contract With Customer, Deposit Liability, Current Contract With Customer, Deposit Liability, Current Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Counterparty Name [Axis] Counterparty Name [Axis] Subsequent Event [Line Items] Subsequent Event [Line Items] Number of additional shares authorized for issuance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized Ordinary Shares Ordinary Shares Outstanding and issued common stock options Common Stock [Member] Shares vested (in shares) 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] Net decrease in cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Accrued professional and consulting Accrued Professional Fees, Current Research and Development Arrangement, Contract to Perform for Others, Type [Domain] Research and Development Arrangement, Contract to Perform for Others, Type [Domain]