Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Milestone Targets [Domain] Milestone Targets [Domain] Milestone Targets [Domain] Title of 12(b) Security Title of 12(b) Security Net loss attributable to common stockholders, diluted Net Income (Loss) Available to Common Stockholders, Diluted Forward Contract Indexed to Issuer's Equity, Type [Axis] Forward Contract Indexed to Issuer's Equity, Type [Axis] Initial rent-free period Lessee, Operating Lease, Initial Rent-Free Period Lessee, Operating Lease, Initial Rent-Free Period Document Fiscal Year Focus Document Fiscal Year Focus Adjustment to Compensation, Amount Adjustment to Compensation Amount Segment Reporting [Abstract] Schedule of Financial Instruments Carried at Fair Value on a Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Common stock, $0.0001 par value per share, 175,000,000 shares authorized as of September 30, 2026 and December 31, 2025, 62,754,200 and 51,902,614 shares issued and outstanding as of September 30, 2026 and December 31, 2025, respectively Common Stock, Value, Issued 2027 Lessee, Operating Lease, Liability, to be Paid, Year One Employee compensation and benefits Employee-related Liabilities, Current 2024 Equity Incentive Plan 2024 Equity Incentive Plan [Member] 2024 Equity Incentive Plan Entity Ex Transition Period Entity Ex Transition Period Restatement Determination Date Restatement Determination Date Class of Warrant or Right [Domain] Class of Warrant or Right [Domain] Proceeds from sale of common stock and warrants Sale Of Stock, Consideration Received On Transaction, Gross Sale Of Stock, Consideration Received On Transaction, Gross Vesting of restricted common stock (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Amendment Flag Amendment Flag Gain on termination of lease Gain (Loss) on Termination of Lease Current liabilities: Liabilities, Current [Abstract] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Principal payments on finance leases Finance Lease, Principal Payments Class of Warrant or Right [Table] Class of Warrant or Right [Table] Related Parties Related Party Transactions Disclosure [Text Block] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Schedule of Cash and Cash Equivalents Schedule of Cash and Cash Equivalents [Table Text Block] Entity Address, State or Province Entity Address, State or Province Options granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Settlement of derivative tranche on August 3, 2026 Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements PEO Total Compensation Amount PEO Total Compensation Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Assets Assets, Fair Value Disclosure [Abstract] Accrued expenses and other liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Weighted-average shares of common stock outstanding, basic (in shares) Weighted-average common shares outstanding, basic (in shares) Weighted Average Number of Shares Outstanding, Basic Pre-funded warrants issued (in shares) Sale Of Stock, Number Of Warrants Issued In Transaction Sale Of Stock, Number Of Warrants Issued In Transaction Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Number of founders Number Of Founders Number of founders. Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Issuance costs in accounts payable and accrued expenses Issuance Costs Incurred But Not Yet Paid Issuance Costs Incurred But Not Yet Paid Incremental borrowing rate used for lease Lessee, Operating Lease, Incremental Borrowing Rate Lessee, Operating Lease, Incremental Borrowing Rate Number of reportable segments Number of Reportable Segments Total current liabilities Liabilities, Current 2030 Lessee, Operating Lease, Liability, to be Paid, Year Four Lease modification fee Lease Modification Fee Payable Lease Modification Fee Payable Operating lease costs: Lease, Cost [Abstract] Entity Address, City or Town Entity Address, City or Town Derivative tranche liability Derivative, fair value, net Derivative, Fair Value, Net Stock-Based Compensation Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Net loss attributable to common stockholders, basic Net Income (Loss) Available to Common Stockholders, Basic Level 2 Fair Value, Inputs, Level 2 [Member] Other (expense) income, net: Nonoperating Income (Expense) [Abstract] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Collaborative Arrangement and Arrangement Other than Collaborative [Table] Collaborative Arrangement and Arrangement Other than Collaborative [Table] Payments of stock and warrant issuance costs Payments Of Stock And Warrant Issuance Costs Payments Of Stock And Warrant Issuance Costs Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Purchase of property and equipment in accounts payable and accrued expenses Capital Expenditures Incurred but Not yet Paid Deferred revenue Increase (Decrease) in Contract with Customer, Liability Schedule of Segment Reporting Segment Reporting [Table Text Block] Loss on the sale of property and equipment Gain (Loss) on Disposition of Property Plant Equipment Use of Estimates Use of Estimates, Policy [Policy Text Block] Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Axis] Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Schedule of Accrued Expenses and Other Current Liabilities Schedule of Accrued Liabilities [Table Text Block] Schedule of Fair Value Roll-forward of the Aggregate Fair Value of Warrant Liabilities Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Less: Significant segment expenses Segment Reporting, Reconciliation [Abstract] Exercise price of warrants (in USD per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Consulting Agreements with Executive Consultant Consulting Agreements with Executive Consultant [Member] Represents information pertaining to consulting agreement with executive consultant . Schedule of Maturities of Operating Lease Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Document Period End Date Document Period End Date Change in operating assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Preferred stock outstanding (in shares) Preferred Stock, Shares Outstanding 2028 Lessee, Operating Lease, Liability, to be Paid, Year Two Stockholders' Equity Equity [Text Block] Security Exchange Name Security Exchange Name Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Area of lease (approximately) Area of Land Laboratory equipment Laboratory Equipment [Member] Represents information pertaining to laboratory equipment. Entity Shell Company Entity Shell Company Sale of stock, commission rate to sales agents Sale of Stock, Commission Rate to Sales Agents Sale of Stock, Commission Rate to Sales Agents Common stock for issuance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Operating lease liabilities, current portion Operating Lease, Liability, Current Schedule of Property and Equipment, Net Property, Plant, and Equipment [Table Text Block] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Net Loss Per Share Attributable to Common Stockholders Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Upon achievement of first licensed target Upon Achievement Of First Licensed Target [Member] Represents information pertaining to scenario upon achievement of first licensed target. Earnings Per Share [Abstract] Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total liabilities Liabilities Trading Symbol Trading Symbol Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment The Whitehead Institute for Biomedical Research The Whitehead Institute For Biomedical Research [Member] The Whitehead Institute For Biomedical Research 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] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Underwritten Offering Underwritten Offering [Member] Underwritten Offering Company Selected Measure Name Company Selected Measure Name Sale of Stock [Domain] Sale of Stock [Domain] Schedule of Restricted Cash Restrictions on Cash and Cash Equivalents [Table Text Block] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Stock issued Stock To Be Issued, Value, New Issues Stock To Be Issued, Value, New Issues Research and development tax credit receivable Research And Development Tax Credit Receivable, Current Research And Development Tax Credit Receivable, Current Schedule of Weighted Average Remaining Lease Term and Weighted Average Discount Rate Schedule Of Weighted Average Remaining Lease Term And Weighted Average Discount Rate [Table Text Block] Schedule Of Weighted Average Remaining Lease Term And Weighted Average Discount Rate Clinical and preclinical expenses Clinical And Preclinical Expenses Clinical And Preclinical Expenses Depreciation and amortization expense Depreciation, Depletion and Amortization, Nonproduction Related Party Transactions [Abstract] Related Party Transactions [Abstract] Operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] 2017 Warrants outstanding Warrant [Member] Weighted-average common shares outstanding, diluted (in shares) Weighted-average common shares outstanding, diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Related Parties Related Party Transaction [Line Items] Derivatives Tranche Liability Derivatives, Policy [Policy Text Block] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Property and equipment, net Total property and equipment, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Proceeds allocated to the derivative tranche liability Proceeds from Derivative Instrument, Financing Activities Maximum lower range tiered royalties on net sales percentage Collaborative Arrangement, Tiered Royalties Payable On Net Sales, Maximum Lower Range, Percent The maximum lower range percentage of tiered royalties on net sales under the collaborative arrangements. Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Less: amount representing imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Travel and entertainment Travel and Entertainment Expense Less: accumulated depreciation and amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] GlaxoSmithKline Intellectual Property (No. 3) Limited (“GSK”) GlaxoSmithKline Intellectual Property (No. 3) Limited (“GSK”) [Member] GlaxoSmithKline Intellectual Property (No. 3) Limited (“GSK”) Operating cash flows used for operating leases Operating Lease, Payments Award Timing Predetermined Award Timing Predetermined [Flag] Restricted cash, current portion Restricted Cash, Current Prefunded Warrants, Liability, Initial Closing Prefunded Warrants, Liability, Initial Closing [Member] Prefunded Warrants, Liability, Initial Closing Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Stock-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Level 1 Fair Value, Inputs, Level 1 [Member] Effective tax rate Effective Income Tax Rate Reconciliation, Percent Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Total lease payments Lessee, Operating Lease, Liability, to be Paid Schedule of Prepaid Expenses and Other Current Assets Schedule Of Prepaid Expenses And Other Current Assets [Table Text Block] Tabular disclosure of prepaid expenses and other current assets. Variable consideration amount Revenue, Remaining Performance Obligation, Variable Consideration Amount Revenue, Remaining Performance Obligation, Variable Consideration Amount All Executive Categories All Executive Categories [Member] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Operating lease liabilities Increase (Decrease) in Operating Lease Liability Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Preferred stock par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Plan Name [Domain] Plan Name [Domain] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Renewal term Lessee, Operating Lease, Renewal Term Schedule of Basic and Diluted Net Loss per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Segment Reporting Segment Reporting [Text Block] Minimum Minimum [Member] Maximum development milestone payable Collaborative Arrangement, Maximum Development Milestone Payment Obligation The maximum amount payable upon achievement of development milestone under the collaborative arrangements. Expiration Date Trading Arrangement Expiration Date Upon achievement of second licensed target Upon Achievement Of Second Licensed Target [Member] Represents information pertaining to scenario upon achievement of second licensed target. Class of Warrant or Right [Axis] Class of Warrant or Right [Axis] Denominator: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Location, Statement of Income, Balance [Axis] Location, Statement of Income, Balance [Axis] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure 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] Number of performance obligations Revenue, Performance Obligation, Number Of Performance Obligations Revenue, Performance Obligation, Number Of Performance Obligations Unbilled receivable Unbilled Receivables, Current Issuance of common stock in private placement, issuance costs Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Derivative [Table] Derivative [Table] Proceeds from issuance of common stock, net of issuance costs of $1,041 and $2,088, respectively Proceeds from Issuance of Common Stock Common stock, shares authorized (in shares) Common Stock, Shares Authorized Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Sale of stock (in shares) Sale of Stock, Number of Shares Issued in Transaction Exercise Price Award Exercise Price Investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Related Party Transaction [Axis] Related Party Transaction [Axis] Segment Reporting [Line Items] Segment Reporting [Line Items] Amount of gross unrecognized stock-based compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Document Quarterly Report Document Quarterly Report BioMarin Pharmaceutical, Inc. BioMarin Pharmaceutical, Inc. [Member] BioMarin Pharmaceutical, Inc. 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] Segments [Domain] Segments [Domain] Stock-Based Compensation Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Measurement Input Type [Domain] Measurement Input Type [Domain] Change in fair value Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings Proceeds from sale of common stock and warrants Sale of Stock, Consideration Received on Transaction Adoption Date Trading Arrangement Adoption Date Net proceeds received Proceeds from Issuance or Sale of Equity Counterparty Name [Domain] Counterparty Name [Domain] Total stockholders’ equity Balance at beginning Balance at ending Equity, Attributable to Parent Total other (expense) income, net Nonoperating Income (Expense) Total operating lease costs Lease Cost, Excluding Finance Leases Lease Cost, Excluding Finance Leases Prepaid insurance costs Prepaid Insurance Assets Assets [Abstract] Sale of stock, price per warrant (in USD per share) Sale of Stock, Price Per Warrant Sale of Stock, Price Per Warrant Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Risk-free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Forward Contract Indexed to Issuer's Equity, Type [Domain] Forward Contract Indexed to Issuer's Equity, Type [Domain] Lease liability Total future minimum lease obligations Operating Lease, Liability Payments of warrant issuance costs Payments Of Warrant Issuance Costs Payments Of Warrant Issuance Costs Professional and consulting fees Professional Fees Payments of stock issuance costs Issuance costs Payments of Stock Issuance Costs Insider Trading Policies and Procedures [Line Items] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Prepaid expenses and other current assets Total prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Richard Young [Member] Richard Young Private Placement Private Placement [Member] Other Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Number of lease components Number Of Lease Components Number Of Lease Components Prepaid lease costs Prepaid Variable Lease Expense, Current Amount of consideration paid in advance for variable lease expense that provides economic benefits within a future period of one year or the normal operating cycle, if longer. Percentage of outstanding stock maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Percentage of Outstanding Stock Maximum Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Anti-dilutive securities excluded from diluted earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Number of operating segments Number of Operating Segments Schedule of Excluded Anti-dilutive Securities Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Entity Central Index Key Entity Central Index Key All Adjustments to Compensation All Adjustments to Compensation [Member] Equity [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] Net cash used in operating activities Net cash used in operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Stockholders’ equity: Equity, Attributable to Parent [Abstract] Issuance of common stock under employee stock purchase plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Document Transition Report Document Transition Report Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Operating Expenses: Operating Expenses [Abstract] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Schedule of Stock Options Fair Value Assumptions Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] City Area Code City Area Code Total property and equipment Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization All Individuals All Individuals [Member] Non-cash lease expense Operating Lease, Right-of-Use Asset, Periodic Reduction Expected volatility Measurement Input, Price Volatility [Member] Management Management [Member] Name Forgone Recovery, Individual Name Weighted average period over which unrecognized stock-based compensation expense to be recognized (in years) Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Statement [Line Items] Statement [Line Items] Total assets Assets Shares reserved for future issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Weighted average grant-date fair value (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Accelerated termination period Lessee, Operating Lease, Lease Amendment, Accelerated Termination Period Lessee, Operating Lease, Lease Amendment, Accelerated Termination Period Schedule of Stock-Based Compensation Expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Leerink Partners LLC Leerink Partners LLC [Member] Leerink Partners LLC Stock-Based Compensation Share-Based Payment Arrangement [Text Block] Issuance of common stock under employee stock purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Issuance of common stock in private placement, net of issuance costs (in shares) Shares issued (in shares) Stock Issued During Period, Shares, New Issues PEO PEO [Member] Facilities-related and overhead Facilities And Overhead Expense Facilities And Overhead Expense Total stock-based compensation expense Stock-based compensation expense (QTD less than) Share-Based Payment Arrangement, Expense Other long-term liabilities Other Liabilities, Noncurrent External R&D expenses Research And Development Expenses, Current Carrying value as of the balance sheet date of obligations incurred through that date and payable for research and development expenses. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Stock option exercises (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Noncash settlement of derivative tranche liability through issuance of pre-funded warrants Noncash Settlement Of Derivative Tranche Liability Through Issuance Of Pre-funded Warrants Noncash Settlement Of Derivative Tranche Liability Through Issuance Of Pre-funded Warrants Expected term (in years) Fair Value Measurement Inputs and Valuation Techniques [Line Items] Accumulated deficit Retained Earnings [Member] Operating lease liabilities, net of current portion Operating Lease, Liability, Noncurrent Total operating expenses Operating Expenses Probability of achieving specified conditions Measurement Input, Probability Of Achieving Specified Conditions [Member] Measurement Input, Probability Of Achieving Specified Conditions Office And Laboratory Space In Cambridge Office And Laboratory Space In Cambridge [Member] Represents information pertaining to lease of office and laboratory space in Cambridge. Impairment of right-of-use asset Operating Lease, Impairment Loss Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Software and subscriptions expense Prepaid Software And Subscription Expense, Current Amount of consideration paid in advance for software and subscription expense that provides economic benefits within a future period of one year or the normal operating cycle, if longer. Schedule of Fair Value Measurement Inputs and Valuation Techniques Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (in shares) Balance at beginning (in shares) Balance at ending (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Office And Laboratory Space In Watertown, Massachusetts Office And Laboratory Space In Watertown, Massachusetts [Member] Office And Laboratory Space In Watertown, Massachusetts Net loss per share attributable to common stockholders, diluted (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Collaborative Arrangement, Transaction with Party to Collaborative Arrangement Collaborative Arrangement, Transaction with Party to Collaborative Arrangement [Member] Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Valuation Technique, Monte Carlo Pricing Model Valuation Technique, Monte Carlo Pricing Model [Member] Total Shareholder Return Amount Total Shareholder Return Amount Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Liabilities Liabilities, Fair Value Disclosure [Abstract] Schedule of Warrant Liabilities Measured at Fair Value on Recurring Basis Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] Research and development Research and development Research and Development Expense Share price Measurement Input, Share Price [Member] 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] Share-Based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Research and collaboration revenue Revenue from Contract with Customer, Excluding Assessed Tax Financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Working capital Working Capital Represents the amount of working capital. Transaction trigger, volume weighted average price (in USD per share) Forward Contract Indexed to Issuer's Equity, Transaction Trigger, Volume Weighted Average Price Per Share Forward Contract Indexed to Issuer's Equity, Transaction Trigger, Volume Weighted Average Price Per Share At-The-Market Sales Agreement At-The-Market Sales Agreement [Member] At-The-Market Sales Agreement Stock option exercises Stock Issued During Period, Value, Stock Options Exercised Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Issuance of common stock in private placement, net of issuance costs Stock Issued During Period, Value, New Issues Prepaid research and development Prepaid Research And Development Expense, Current Amount of consideration paid in advance for research and development expense that provides economic benefits within a future period of one year or the normal operating cycle, if longer. Construction in progress Construction in Progress [Member] Weighted-average incremental borrowing rate Operating Lease, Weighted Average Discount Rate, Percent Segment Reporting [Table] Segment Reporting [Table] Noncash settlement of derivative tranche liability through issuance of common stock Stock Issued Milestone Targets [Axis] Milestone Targets [Axis] Milestone Targets Related Party Transaction [Table] Related Party Transaction [Table] Proceeds from exercise of stock options and issuance of common stock under employee stock purchase plan Proceeds From Stock Options Exercised And Issuance of Common Stock Under Employee Stock Purchase Plan Proceeds From Stock Options Exercised And Issuance of Common Stock Under Employee Stock Purchase Plan Sale of Stock [Axis] Sale of Stock [Axis] Schedule of Operating Lease Costs and Finance Lease Costs Lease, Cost [Table Text Block] Other Other Assets, Current Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Loss from operations Operating Income (Loss) Current Fiscal Year End Date Current Fiscal Year End Date Office And Laboratory Space In Boulder Office And Laboratory Space In Boulder [Member] Represents information pertaining to lease of office and laboratory space in Boulder. Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Derivative [Line Items] Derivative [Line Items] Related Party Transaction [Domain] Related Party Transaction [Domain] Prefunded Warrants, Liability, Second Closing Prefunded Warrants, Liability, Second Closing [Member] Prefunded Warrants, Liability, Second Closing 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] Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Net Loss Per Share Attributable to Common Stockholders Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Common stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Corporate expenses Corporate Expenses Corporate Expenses Equity Components [Axis] Equity Components [Axis] Related party Related Party [Member] Collaboration and License Agreements Collaboration and License Agreements [Abstract] No definition available. Convertible Preferred Stock and Stockholders' Deficit Class of Stock [Line Items] Upon achievement of third licensed target Upon Achievement Of Third Licensed Target [Member] Represents information pertaining to scenario upon achievement of third licensed target. Entity Interactive Data Current Entity Interactive Data Current Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Small Business Entity Small Business Number of sale of stock closings in transaction Number Of Sale Of Stock Closings In Transaction Number Of Sale Of Stock Closings In Transaction Total comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent 2029 Lessee, Operating Lease, Liability, to be Paid, Year Three Termination Date Trading Arrangement Termination Date Property and Equipment, Net Property, Plant, and Equipment [Line Items] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Expiration period Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Other assets Other Assets, Noncurrent Document Type Document Type Fair Value Measurements Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Other information: Supplemental Information Relating To Leases [Abstract] No definition available. Accrued expenses and other current liabilities Total accrued expenses and other current liabilities Accrued Liabilities, Current Third Party Investor Third Party Investor [Member] Third Party Investor Fair Value as of Grant Date Award Grant Date Fair Value Non-cash interest expense Paid-in-Kind Interest Forward sale of stock or warrants price per share (in USD per share) Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Deferred revenue, net of current portion Contract with Customer, Liability, Noncurrent Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies (Note 4) Commitments and Contingencies Research and collaboration revenue Revenue Revenues Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] R&D R&D [Member] R&D 2026 Inducement Plan 2026 Inducement Plan [Member] 2026 Inducement Plan Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Vesting period of the award (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Furniture and fixtures Furniture and Fixtures [Member] Counterparty Name [Axis] Counterparty Name [Axis] Liabilities and Stockholders’ Equity Liabilities and Equity [Abstract] Fixed consideration amount Revenue, Remaining Performance Obligation, Fixed Consideration Amount Revenue, Remaining Performance Obligation, Fixed Consideration Amount All Award Types Award Type [Domain] Transaction trigger, number of trading days Forward Contract Indexed to Issuer's Equity, Transaction Trigger, Number Of Trading Days Forward Contract Indexed to Issuer's Equity, Transaction Trigger, Number Of Trading Days Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount 2026 (three months remaining) Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Fair Value Measurements Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Expected term (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Term of lease Lessee, Operating Lease, Term of Contract PEO Name PEO Name Leasehold improvements Leasehold Improvements [Member] Restricted cash Restricted Cash Deferred revenue Contract with Customer, Liability Plus: Other segment (loss) income Segment Reporting, Other Segment Item, Amount Long-Lived Asset, Class [Axis] Long-Lived Asset, Class [Axis] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Computer and software Computer And Software [Member] Represents information pertaining to computer and software used in an office setting. Percentage of estimated fair value on grant date Share-Based Compensation Arrangement By Share-Based Payment Award, Percentage Of Estimated Fair Value On Grant Date Share-Based Compensation Arrangement By Share-Based Payment Award, Percentage Of Estimated Fair Value On Grant Date Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] 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 Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Collaboration and License Agreements Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] Professional fees Accrued Professional Fees, Current Accounts payable Increase (Decrease) in Accounts Payable Other Other Accrued Liabilities, Current Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] 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] Basis of Presentation and Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Personnel-related expenses Labor and Related Expense Prefunded Warrants, Liability Prefunded Warrants, Liability [Member] Prefunded Warrants, Liability Net loss per share attributable to common stockholders, basic (in dollars per share) Earnings Per Share, Basic Initial license issuance fee payment Collaborative Arrangement, Upfront License Issuance Fee Payment Amount of initial payment for license issuance fees under the collaborative arrangements. Measurement Input Type [Axis] Measurement Input Type [Axis] Current portion of deferred revenue Contract with Customer, Liability, Current Risk-free interest rate Measurement Input, Risk Free Interest Rate [Member] Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Award Type Award Type [Axis] Short-term lease expense Short-Term Lease, Cost Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] 2024 Plan and 2026 Inducement Plan 2024 Plan And 2026 Inducement Plan [Member] 2024 Plan And 2026 Inducement Plan Issuance of pre-funded warrants in private placement, net of issuance costs Adjustments to Additional Paid in Capital, Warrant Issued Accumulated deficit Retained Earnings (Accumulated Deficit) Sale of stock, specified beneficial ownership threshold maximum Sale Of Stock, Specified Beneficial Ownership Threshold Maximum Sale Of Stock, Specified Beneficial Ownership Threshold Maximum Fulcrum Therapeutics, Inc. Fulcrum Therapeutics, Inc. [Member] Fulcrum Therapeutics, Inc. Restricted cash, net of current portion Restricted Cash, Noncurrent Transaction trigger, number of consecutive trading days Forward Contract Indexed to Issuer's Equity, Transaction Trigger, Number Of Consecutive Trading Days Forward Contract Indexed to Issuer's Equity, Transaction Trigger, Number Of Consecutive Trading Days 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] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common stock Common Stock [Member] Expected volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Lease expense Operating Lease, Cost Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Reclassification Reclassification, Comparability Adjustment [Policy Text Block] Expected dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Forward contract indexed to equity, settlement, cash, amount (up to approximately) Forward Contract Indexed to Equity, Settlement, Cash, Amount Equity Awards Adjustments Equity Awards Adjustments [Member] Collaboration and License Agreements Collaborative Arrangement Disclosure [Text Block] Total liabilities and stockholders’ equity Liabilities and Equity Derivative tranche liability Derivative tranche liability Derivative Liability, Noncurrent Variable lease expense Variable Lease, Cost Finance lease right-of-use asset converted to fixed asset Finance Lease Right-Of-Use Asset Converted To Fixed Asset Finance Lease Right-Of-Use Asset Converted To Fixed Asset Options to purchase common stock Stock options outstanding Share-Based Payment Arrangement, Option [Member] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Plan Name [Axis] Plan Name [Axis] Related and Nonrelated Parties [Domain] Related and Nonrelated Parties [Domain] Derivative tranche liability measurement input Derivative Liability, Measurement Input Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Daniel Tardiff [Member] Daniel Tardiff Other (expense) income Other Nonoperating Income (Expense) Name Awards Close in Time to MNPI Disclosures, Individual Name 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] General and administrative General and administrative (less than) General and Administrative Expense Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Sale of stock (in USD per share) Sale of Stock, Price Per Share Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Children Medical Center Corporation Children Medical Center Corporation [Member] Children Medical Center Corporation Derivative Tranche Liability Derivatives and Fair Value [Text Block] Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Term after first commercial sale Collaborative Arrangement, Term After First Commercial Sale Collaborative Arrangement, Term After First Commercial Sale Adjustment to Compensation: Adjustment to Compensation [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Private placement agreement, purchase of securities, number of tranches Private Placement Agreement, Purchase Of Securities, Number Of Tranches Private Placement Agreement, Purchase Of Securities, Number Of Tranches Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Principal payments on financing obligation Principal Payments On Financing Obligations, Failed Sale Leaseback Transaction Amount of cash outflow for the principal payments on the financing obligations arising from the failed sale-leaseback transaction during the period. Additional paid-in capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Expected term (in years) Measurement Input, Expected Term [Member] Change in fair value of derivative tranche liability Change in fair value of derivative tranche liability Gain (Loss) on Derivative Instruments, Net, Pretax Prepaid Expense and Other Assets, Current [Abstract] Prepaid Expense and Other Assets, Current [Abstract] Company Selected Measure Amount Company Selected Measure Amount Forward sale of stock contract (in shares) Forward Contract Indexed to Issuer's Equity, Indexed Shares Depreciation and amortization Depreciation, Depletion and Amortization Entity Address, Address Line Two Entity Address, Address Line Two Stock, Class of Stock [Table] Stock, Class of Stock [Table] Current assets: Assets, Current [Abstract] Weighted-average remaining lease term in years Operating Lease, Weighted Average Remaining Lease Term Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Right-of-use assets obtained in exchange of operating lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Provision for federal, state or foreign income tax Income Tax Expense (Benefit) Issuance of pre-funded warrants in private placement, issuance costs Adjustments To Additional Paid In Capital, Prefunded Warrants Issued, Issuance Costs Adjustments To Additional Paid In Capital, Prefunded Warrants Issued, Issuance Costs Award Timing Method Award Timing Method [Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Net change 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 Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Numerator: Net Income (Loss) Attributable to Parent [Abstract] Net loss Net loss attributable to common stockholders Net loss Net loss Net Income (Loss) Attributable to Parent Variable consideration amount, commercial sales milestones Revenue, Remaining Performance Obligation, Variable Consideration Amount, Commercial Sales Milestones Revenue, Remaining Performance Obligation, Variable Consideration Amount, Commercial Sales Milestones Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Proceeds from the sale of property and equipment Proceeds from Sale of Property, Plant, and Equipment Statement [Table] Statement [Table] Proceeds from issuance of pre-funded warrants, net of issuance costs of $2,113 and $258, respectively Proceeds from Issuance of Warrants Restatement Determination Date: Restatement Determination Date [Axis] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Interest income Investment Income, Interest Shares issuable upon settlement of derivative tranche liability in Private Placement Shares Issuable Upon Settlement Of Private Placement Tranche Liability [Member] Shares Issuable Upon Settlement Of Private Placement Tranche Liability Consulting Agreements with Founders Consulting Agreements with Founders [Member] Represents information pertaining to consulting agreement with founder. Shelf Registration Statement Shelf Registration Statement [Member] Shelf Registration Statement Revenue: Revenues [Abstract] Beginning balance Ending balance Remeasured derivative tranche liability Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract]