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Clinical Trials Clinical trials Clinical Trials Statement of Cash Flows [Abstract] Common stock issuance Stock Issued During Period, Value, New Issues Issuance of common stock, net of issuance costs Summary of Stock Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Net Loss Per Share Earnings Per Share [Text Block] Proceeds From Issuance of Common Stocks Proceeds From Issuance of Common Stocks Issuance of common stock, net of issuance costs Net loss Net loss Aggregate Intrinsic Value, Beginning Balance Aggregate Intrinsic Value, Ending Balance Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Operating Lease, Cost Total fixed operating lease cost Expected dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Operating lease payments Operating Lease, Payments Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Aggregate Intrinsic Value, Options Exercisable Assets Assets [Abstract] Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Document Fiscal Year Focus Document Fiscal Year Focus Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Accounts Payable, Current, Total Accounts payable Accounts Payable, Current Research and Development Research and Development Expense [Member] Fair Value Measurement Fair Value Measurement, Policy [Policy Text Block] Two Thousand Twenty Four At The Market Offering Sales Agreement [Member] Two Thousand Twenty Four At The Market Offering Sales Agreement [Member] 2025 At The Market Offering Sales Agreement Proceeds from issuance of common stock in connection with the exercise of stock options Proceeds from Stock Options Exercised Common Stock Warrants Exercised Fair Value Disclosures [Abstract] Commitments and Contingencies Disclosure [Abstract] Personnel Expenses Personnel Expenses Personnel Research Service Agreement Research Service Agreement [Member] Research service agreement. Upfront payment Upfront Payment Upfront payment Share-Based Payment Arrangement [Abstract] Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total Unrecognized compensation cost related to unvested stock-based awards Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Assets, Fair Value Disclosure, Total Total Assets, Fair Value Disclosure Development Services Development Services Development services Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Excluding Option Exercised Proceeds from issuance of common stock under employee stock purchase plan Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Net cash provided by (used in) investing activities Finance Lessee Undiscounted Lease Payments Finance Lessee Undiscounted Lease Payments Total undiscounted lease payments Weighted average remaining lease term - finance leases (in years) Finance Lease, Weighted Average Remaining Lease Term Title of 12(b) Security Title of 12(b) Security Weighted Average Exercise Price, Forfeited/Cancelled Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Issuance of Common Stock, Warrants and Pre Funded Warrants, Shares Issuance of Common Stock, Warrants and Pre Funded Warrants, Shares Issuance of common stock upon exercise of pre-funded warrants, Shares Issuance of common stock, warrants and pre-funded warrants, net of issuance costs, Shares Money Market Funds Money Market Funds [Member] Income Taxes Income Tax Disclosure [Text Block] Accounts Payable Accounts Payable [Member] Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year July 1, 2025 - December 31, 2025 July 1, 2026 - December 31, 2026 Total undiscounted lease payments Total undiscounted lease payments Lessee Undiscounted Lease Payments Lessee Undiscounted Lease Payments Finance Lease, Right-of-Use Asset, after Accumulated Amortization Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total Finance lease right-of-use assets 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] Weighted Average Exercise Price, Beginning Balance Weighted Average Exercise Price, Ending Balance Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Income Tax Disclosure [Abstract] Unrecognized Tax Benefits, Ending Balance Unrecognized Tax Benefits, Beginning Balance Unrecognized tax benefits Unrecognized Tax Benefits Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Accrued and other current liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Measurement Frequency Measurement Frequency [Domain] Income Statement Location Statement of Income Location, Balance [Axis] CABA-201 and MuSK-CAART [Member] CABA-201 and MuSK-CAART [Member] Caba201 And Musk Caart [Member] Trading Symbol Trading Symbol Risk-free interest rate, maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Subsequent Event Type [Axis] Employee-related Liabilities, Current, Total Compensation expense Employee-related Liabilities, Current Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Issuance Of Common Stock Upon Exercise Of Common Stock Warrants Shares During Period Issuance Of Common Stock Upon Exercise Of Common Stock Warrants Shares During Period Issuance of common stock upon exercise of common stock warrants, Shares Expected term Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Fair Value, Measurements, Recurring Fair Value, Recurring [Member] Entity Ex Transition Period Entity Ex Transition Period Total lease liability Total lease liability Lessee, Operating Lease, Liability, to be Paid Lonza Agreement [Member] Lonza Agreement [Member] Lonza Agreement [Member] Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Additional in fixed undiscounted lease payments Proceeds From Issuance of Common Stock Warrants and Pre Funded Warrants Net of Issuance Cost Proceeds From Issuance of Common Stock Warrants and Pre Funded Warrants Net of Issuance Cost Proceeds from the issuance of common stock, warrants and pre-funded warrants, net of issuance costs Equity Components Equity Components [Axis] Issuance Of Common Stock from ATM Offering Amount Issuance of common stock from ATM offering, net of sales agent commission and fees Issuance of Common Stock from ATM Offering, Amount Issuance of common stock from ATM offering, Amount Total cost Total cost of Licensing Agreements and Other Agreements Total cost of Licensing Agreements and Other Agreements Equity Component Equity Component [Domain] Stock Issued During Period, Shares, Employee Stock Purchase Plans Issuance of common stock under employee stock purchase plan, shares License maintenance fee License Maintenance Fee License maintenance fee. Maximum Maximum [Member] Statistical Measurement Statistical Measurement [Axis] Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted Average Exercise Price, Exercised Earning Per Share Basic And Diluted [Line Items] Earning Per Share Basic And Diluted [Line Items] Earning per share basic and diluted. Common Stock, Value, Issued Voting and non-voting common stock, $0.00001 par value: 600,000,000 (593,590,481 voting and 6,409,519 non-voting) shares authorized as of June 30, 2026 and 300,000,000 (293,590,481 voting and 6,409,519 non-voting) shares authorized as December 31, 2025; 167,726,537 voting shares issued and outstanding as of June 30, 2026 and 100,479,323 voting shares issued and outstanding as of December 31, 2025 Issuance of common stock Finance Lease, Principal Payments Principal payments on finance leases Principal payments on finance leases Early termination fee Liabilities Subject to Compromise, Early Contract Termination Fees Cash and Cash Equivalents [Abstract] Cash equivalents: Ending Balance Beginning Balance Equity, Including Portion Attributable to Noncontrolling Interest Equity, Including Portion Attributable to Noncontrolling Interest, Total Legal Entity Type of Counterparty Legal Entity Type of Counterparty [Domain] Other comprehensive income: Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Commitments And Contingencies Disclosure [Table] Commitments And Contingencies Disclosure [Table] Commitments and contingencies disclosure. Supply Commitment Supply Commitment [Axis] Expected volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Preferred stock, authorized shares Preferred Stock, Shares Authorized Increase in the Number of authorized shares Increase In The Number Of Authorized Shares Increase In The Number Of Authorized Shares Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Entity Registrant Name Entity Registrant Name Unaudited Interim Financial Information Unaudited Interim Financial Information Policy [Text Block] Unaudited interim financial information. Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Gross Unrealized Losses Subsequent Events [Abstract] Collaborations Licensing Agreements And Other Agreements [Table] Collaborations Licensing Agreements And Other Agreements [Table] Collaborations licensing agreements and other agreements. Income Tax Expense (Benefit), Total Income tax benefit Income Tax Expense (Benefit) Measurement Frequency Measurement Frequency [Axis] Proceeds from Issuance of Common Stock Proceeds from the issuance of common stock, warrants and pre-funded warrants, net of issuance costs Proceeds from issuance of common stock upon exercise of common stock warrants Issuance of common stock, warrants and pre-funded warrants, net of issuance costs Issuance of Common Stock Upon Exercise of Pre-Funded Warrants Amount Issuance of Common Stock Upon Exercise of Pre-Funded Warrants Amount Issuance of common stock, warrants and pre-funded warrants, net of issuance costs of $6,442 Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Significant Accounting Policies [Policy Text Block] Significant Accounting Policies [Policy Text Block] Significant Accounting Policies Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Weighted average remaining lease term Lessee, Operating Lease, Remaining Lease Term Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated other comprehensive income Percentage of shares to be purchased Percentage Of Shares Purchased At Fair Market Value Of Common Stock Percentage of shares purchased at fair market value of common stock. Payments to Acquire Property, Plant, and Equipment, Total Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Payments for Commissions Sales agent commission and fees Total Assets Assets Total Fixed Finance Lease Cost Total Fixed Finance Lease Cost Total fixed finance lease cost Weighted Average Remaining Contractual Term (years), Options Exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Income Statement [Abstract] Operating Cash Flows Used For Operating Leases Operating Cash Flows Used For Operating Leases Operating cash flows used for operating leases Total finance lease cost Total Finance Lease Cost Amount of lease cost recognized by lessee for lease contract. Common stock issuance, Shares Stock Issued During Period, Shares, New Issues Issuance of common stock, net of issuance costs, Shares Amounts due to agreement Collaborative Agreement Payments Due Collaborative agreement payments due. Net loss per share, diluted Net loss per share of voting and non-voting common stock, diluted Earnings Per Share, Diluted, Total Earnings Per Share, Diluted Non Rule 10b51 Arr Modified Flag Non Rule 10b51 Arr Modified Flag Non Rule 10b5-1 Arrangement Modified City Area Code City Area Code shares remaining available for issuance shares remaining available for issuance Shares remaining available for issuance Finance Lease, Liability, Noncurrent Finance lease liabilities, net of current portion Counterparty Name Counterparty Name [Domain] 2018 Plan Two Thousand Eighteen Stock Option And Grant Plan [Member] Two thousand eighteen stock option and grant plan. Variable lease cost Variable Lease, Cost Issuance of common stock under employee stock purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Master Translational Research Services Agreement Master Translational Research Services Agreement [Member] Master translational research services agreement. Operating Lease, Weighted Average Remaining Lease Term Weighted average remaining lease term - operating leases (in years) Lease, Cost Total operating lease cost Property, Plant and Equipment, Net, Total Property and equipment, net Property, Plant and Equipment, Net Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Right-of-use assets obtained in exchange for operating lease obligations Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total Cash and cash equivalents—beginning of period Cash and cash equivalents—end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Loss from operations Operating Income (Loss) Loss from operations Commitments and Contingencies [Line Items] Commitments And Contingencies Disclosure [Line Items] Commitments and contingencies disclosure. Retained Earnings [Member] Accumulated Deficit [Member] Cash and Cash Equivalents Cash and Cash Equivalents [Axis] 2019 ESPP Two Thousand Nineteen Employee Stock Purchase Plan [Member] Two thousand nineteen employee stock purchase plan. Share-Based Payment Arrangement, Noncash Expense, Total Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Payments of Stock Issuance Costs Issuance of common stock, net of issuance costs Percentage of payroll deduction on eligible compensation. Payroll deduction percentage of eligible compensation Percentage Of Payroll Deduction On Eligible Compensation Issuance of common stock from ATM offering, net of sales agent commission and fees Issuance of common stock from ATM offering, net of sales agent commission and fees Issuance of common stock from ATM offering, net of sales agent commission and fees Unvested Stock Option Unvested Stock Option [Member] Unvested Stock Option [Member] Operating Lease, Weighted Average Discount Rate, Percent Weighted average discount rate - operating leases Operating Lease, Liability, Noncurrent Operating lease liabilities, net of current portion Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Class Of Stock [Line Items] Class of Stock [Line Items] Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Net cash provided by financing activities Lease, Cost [Table Text Block] Lease Cost Recognized Under ASC 842 License Agreement License Agreement [Member] License agreement. Nonoperating Income (Expense) [Abstract] Other income (expense): Schedule of Antidilutive Shares Excluded from Calculation of Diluted Net Loss Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Debt Securities Available For Sale [Table] Debt Securities, Available-for-Sale [Table] Entity Interactive Data Current Entity Interactive Data Current Income Statement Location Statement of Income Location, Balance [Domain] Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] General and administrative services Accrued General And Administrative Services Current Accrued general and administrative services current. Accretion (Amortization) of Discounts and Premiums, Investments Amortization of discount on investments Accrued and Other Current Liabilities Accrued And Other Current Liabilities [Member] Accrued and other current liabilities. Sponsored Research Agreements Sponsored Research Agreements [Member] Sponsored Research Agreements. License of Intellectual Property License of Intellectual Property License of intellectual property Entity Tax Identification Number Entity Tax Identification Number Increase in the lease liability Increase in the lease liability Increase in the lease liability Proceeds from maturities of investments Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations, Total Local Phone Number Local Phone Number Other Other Liabilities, Current Short-Term Lease, Cost Short-term lease cost Issuance of Common Stock Net of Issuance Costs Issuance of Common Stock Net of Issuance Costs Issuance of common stock, net of issuance costs of $9,801 Remaining research and development expense to be incurred Remaining Research And Development Expense To Be Incurred Remaining research and development expense to be incurred. Accounting Policies [Abstract] Collaborations, Licensing Agreements And Other Agreements [Line Items] Collaborations Licensing Agreements And Other Agreements [Line Items] Collaborations licensing agreements and other agreements. Money Market Funds Included in Cash and Cash Equivalents Cash and Cash Equivalents [Member] Class of Stock Class of Stock [Domain] Penn Regents Of University Of California [Member] Regents of the university of California. Unrecognized compensation cost, period for recognition Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Cash, Cash Equivalents, and Short-Term Investments, Total Cash and cash equivalents and investments Cash, Cash Equivalents, and Short-Term Investments Schedule Of Stock By Class [Table] Stock, Class of Stock [Table] Entity Emerging Growth Company Entity Emerging Growth Company