Document and Entity Information [Abstract] Document Type Document Quarterly Report Document Period End Date Document Transition Report Entity File Number Entity Registrant Name Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One Entity Address, Adress Line Two Entity Address, City or Town Entity Address State Or Province Entity Address, Postal Zip Code City Area Code Local Phone Number Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Ex Transition Period Entity Shell Company Title of 12(b) Security Trading Symbol Security Exchange Name Entity Common Stock, Shares Outstanding Entity Central Index Key Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag Condensed Consolidated Balance Sheets Statement [Table] Statement [Line Items] Statement Assets [Abstract] Assets Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Short-Term Investments Short-term investments Restricted Cash, Current Restricted cash Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Assets, Current Total current assets Property, Plant and Equipment, Net Property and equipment, net Operating Lease, Right-of-Use Asset Operating lease right-of-use assets, net Long-Term Investments Long-term investments Other Assets, Noncurrent Other non-current assets Total other assets Assets Total assets Liabilities and Equity [Abstract] Liabilities and Stockholders' Equity Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Current Accounts payable Accrued Liabilities, Current Total accrued expenses Accrued expenses Operating Lease, Liability, Current Operating lease liabilities, current Liabilities, Current Total current liabilities Operating Lease, Liability, Noncurrent Operating lease liabilities, non-current Liabilities Total liabilities Commitments and Contingencies. Commitments and contingencies (Note 12) Equity, Attributable to Parent [Abstract] Stockholders' equity: Preferred Stock, Value, Issued Preferred stock, par value $0.0001 per share; 25,000,000 shares authorized and no shares issued and outstanding as of March 31, 2025 and December 31, 2024 Common Stock, Value, Issued Common stock, par value $0.0001 per share; 175,000,000 shares authorized; 41,821,887 and 41,793,412 shares issued and outstanding as of March 31, 2025 and December 31, 2024, respectively Additional Paid in Capital Additional paid-in capital Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income Retained Earnings (Accumulated Deficit) Accumulated deficit Accumulated deficit Equity, Attributable to Parent Balance at end Balance at the beginning Total stockholders' equity Liabilities and Equity Total liabilities and stockholders' equity Preferred Stock, Par or Stated Value Per Share Preferred stock, par value (in dollar per share) Preferred Stock, Shares Authorized Preferred stock, shares authorized Preferred Stock, Shares Issued Preferred stock, shares issued Preferred Stock, Shares Outstanding Preferred stock, shares outstanding Common Stock, Par or Stated Value Per Share Common stock, par value (in dollar per share) Common Stock, Shares Authorized Common stock, shares authorized Common stock, shares authorized (in shares) Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Outstanding Common Stock, shares outstanding Condensed Consolidated Statements of Operations and Comprehensive Loss Revenues [Abstract] Revenue: Revenue from Contract with Customer, Excluding Assessed Tax License and collaboration revenue Revenue Revenues Revenue Total revenue Operating Expenses [Abstract] Operating expenses: Research and Development Expense Research and development expenses Research and development General and Administrative Expense General and administrative General and administrative Operating Expenses Total operating expenses Operating Income (Loss) Loss from operations Nonoperating Income (Expense) [Abstract] Other income (expense), net: Amount of expense (income) related to adjustment to fair value of convertible notes. Fair Value Adjustment of Convertible Notes Fair value adjustments to convertible notes Change in fair value of convertible notes Other Nonoperating Income (Expense) Other income, net Nonoperating Income (Expense) Total other income (expense), net Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Loss before income taxes Income Tax Expense (Benefit) Income tax benefit Net loss Net loss to common stockholders Net loss to common stockholders Earnings Per Share, Basic Net loss per share attributable to common stockholders - basic (in dollars per share) Earnings Per Share, Diluted Net loss per share attributable to common stockholders - diluted (in dollars per share) Weighted Average Number of Shares Outstanding, Basic Weighted-average common stock outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Diluted Weighted-average common stock outstanding - diluted (in shares) Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Comprehensive loss: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Other comprehensive income (loss): OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Unrealized gain on investments Unrealized gain on investments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Foreign currency translation adjustment Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive loss Condensed Condensed Consolidated Statements of Stockholders' Equity (Deficit) Equity Components [Axis] Equity Component [Domain] Common Stock [Member] Common Stock Additional Paid-in Capital [Member] Additional Paid-in Capital AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income Retained Earnings [Member] Accumulated Deficit Class of Stock [Axis] Class of Stock [Domain] Represents the information pertaining to Series seed convertible preferred stock. Series Seed Convertible Preferred Stock [Member] Series Seed convertible preferred stock Series A Preferred Stock [Member] Series A convertible preferred stock Series A preferred stock Series B Preferred Stock [Member] Series B convertible preferred stock Increase (Decrease) in Temporary Equity [Roll Forward] Changes in Convertible Preferred Stock Temporary Equity, Carrying Amount, Attributable to Parent Balance at end Balance at beginning Temporary Equity, Shares Outstanding Balance at the end (in shares) Balance at beginning (in shares) Increase (Decrease) in Stockholders' Equity [Roll Forward] Changes in Stockholders' Equity (Deficit) Shares, Outstanding Balance at end (in shares) Balance at beginning (in shares) Stock Repurchased During Period, Shares Repurchase of unvested restricted stock awards (in shares) Stock Issued During Period, Shares, New Issues Issuance of common stock (in shares) Number of common stock issued Stock Issued During Period, Value, Stock Options Exercised Exercises of common stock options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Exercised (in shares) Exercises of common stock options (in shares) APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Stock-based compensation expense Condensed Consolidated Statements of Cash Flows Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Depreciation Depreciation expense Gain (Loss) on Disposition of Property Plant Equipment Loss on disposal of property and equipment Amortization of Debt Discount (Premium) Net amortization of premiums and accretion of discounts on investments Share-Based Payment Arrangement, Noncash Expense Stock-based compensation expense Amount of non-cash lease expense. Non-cash lease expense Non-cash lease expense Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other assets Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Accrued Liabilities Accrued expenses Increase (Decrease) in Operating Lease Liability Operating lease liabilities Increase (Decrease) in Other Current Liabilities Other current liabilities Net Cash Provided by (Used in) Operating Activities Net cash used in operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Payments to Acquire Investments Purchases of investments Proceeds from Sale, Maturity and Collection of Investments Proceeds from sales and maturities of investments Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Proceeds from Issuance Initial Public Offering Proceeds from initial public offering, net of underwriting discount and commissions Aggregate gross proceeds Payments of Stock Issuance Costs Payment of initial public offering costs Proceeds from Stock Options Exercised Proceeds from exercise of stock options Net Cash Provided by (Used in) Financing Activities Net cash provided by (used in) financing activities Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Effect of exchange rate changes on cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net decrease in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Cash, cash equivalents and restricted cash at end of period Cash, cash equivalents and restricted cash at beginning of period Total cash, cash equivalents and restricted cash Supplemental Cash Flow Information [Abstract] Supplemental disclosure of non-cash investing and financing activities: Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Right-of-use assets obtained under operating lease arrangements The amount of deferred offering costs included in accounts payable and accrued expenses. Deferred Offering Costs Included In Accounts Payable and Accrued Expenses Deferred offering costs in accounts payable and accrued expenses No definition available. Reconciliation Of Cash Cash Equivalents And Restricted Cash And Cash Equivalents [Abstract] Reconciliation of cash, cash equivalents and restricted cash: Nature of Business Nature of Operations [Text Block] Nature of Business Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Fair Value Measurements Fair Value Disclosures [Text Block] Fair Value Measurements Other Assets Other Assets Disclosure [Text Block] Other Assets Accrued Expenses Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Accrued Expenses Leases Lessee, Operating Leases [Text Block] Leases N/a. License and Collaboration Revenue Collaborative Arrangement Disclosure [Text Block] License and Collaboration Revenue No definition available. License Agreements The entire disclosure for license agreements. License Agreements [Text Block] License Agreements Common Stock Equity [Text Block] Common Stock Stock-Based Compensation Share-Based Payment Arrangement [Text Block] Stock-Based Compensation Net Loss Per Share Earnings Per Share [Text Block] Net Loss Per Share Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Related Party Transactions Related Party Transactions Disclosure [Text Block] Related Party Transactions Segment Information Segment Reporting Disclosure [Text Block] Segment Information Disclosure of accounting policy for basis of presentation and consolidation. Basis Of Presentation And Consolidation [Policy Text Block] Basis of Presentation and Consolidation Disclosure of accounting policy for unaudited interim financial information. Unaudited Interim Financial Information, Policy [Policy Text Block] Unaudited Interim Financial Information Use of Estimates, Policy [Policy Text Block] Use of Estimates New Accounting Pronouncements, Policy [Policy Text Block] Recent Accounting Pronouncements Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of information about the Company's assets and liabilities that are regularly measured and carried at fair value Debt Securities, Available-for-Sale [Table Text Block] Summary of available-for-sale securities Schedule of Other Assets, Noncurrent [Table Text Block] Summary of other assets Schedule of Accrued Liabilities [Table Text Block] Summary of accrued expenses Tabular disclosure of undiscounted cash flows of lessee's operating lease liability, Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position and quantitative information pursuant to operating lease. Lessee, Operating Lease, Liability, to be Paid, Maturity And Quantitative Disclosure [Table Text Block] Schedule of minimum lease payments under the Company's operating leases Tabular disclosure of common stock reserved for potential conversion of securities and shares reserved for future issuance. Schedule Of Common Stock Reserved For Potential Conversion Of Securities And Future Issuance [Tables Text Block] Schedule of common stock reserved for potential conversion and future issuance Share-Based Payment Arrangement, Option, Activity [Table Text Block] Schedule of stock option activity and related information Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Schedule of stock-based compensation expense as reflected in consolidated statements of operations Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of basic and diluted net loss per share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of anti-dilutive securities excluded from the computation of diluted net loss per share Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Schedule of financial data for reportable segments Collaborative Arrangement and Arrangement Other than Collaborative [Table] Sale of Stock [Axis] Sale of Stock [Domain] IPO [Member] IPO Over-Allotment Option [Member] Underwriter's option Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] Nature of Business Number of Operating Segments Number of operating segments Shares Issued, Price Per Share Public offering price Sale of Stock, Consideration Received on Transaction Net proceeds Fair value of initial consideration Convertible Preferred Stock, Shares Issued upon Conversion Convertible preferred stock into common stock Stockholders' Equity Note, Stock Split, Conversion Ratio Reverse stock split Cash, Cash Equivalents, and Short-Term Investments Cash, cash equivalents and investments Fair Value, Recurring and Nonrecurring [Table] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 1 [Member] Level 1 Fair Value, Inputs, Level 2 [Member] Level 2 Financial Instrument [Axis] Financial Instruments [Domain] Commercial Paper [Member] Commercial paper Corporate Debt Securities [Member] Corporate debt securities US Government Corporations and Agencies Securities [Member] Government securities Asset Class [Axis] Asset Class [Domain] Cash [Member] Cash Money Market Funds [Member] Money market funds Measurement Basis [Axis] Portion at Fair Value Measurement [Member] Reported Value Measurement [Member] Carrying value Estimate of Fair Value Measurement [Member] Estimate of fair value measurement Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value Measurements Assets, Fair Value Disclosure [Abstract] Assets: Cash and Cash Equivalents, Fair Value Disclosure Assets Short-term Investments, Fair Value Disclosure [Abstract] Short-term investments: Debt Securities, Available-for-Sale, Current Short-term investments Fair Value Long-term Investments, Fair Value Disclosure [Abstract] Long-term investments: Debt Securities, Available-for-Sale, Noncurrent Long-term investments Assets, Fair Value Disclosure Total assets Statistical Measurement [Axis] Statistical Measurement [Domain] Minimum [Member] Minimum Maximum [Member] Maximum Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. Fair Value, Assets, Level 1 to Level 2 Transfer, Amount Assets - Transfer from level 1 to 2 Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. Fair Value, Assets, Level 2 to Level 1 Transfer, Amount Assets - Transfer from level 2 to 1 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Assets - Transfer into level 3 Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. Fair Value, Liabilities, Level 1 to Level 2 Transfer, Amount Liabilities - Transfer from level 1 to 2 Amount of transfers of liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. Fair Value, Liabilities, Level 2 to Level 1 Transfer, Amount Liabilities - Transfer from level 2 to 1 Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 Liabilities - Transfer into level 3 Period remaining for available-for-sale debt securities, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Available-for-Sale Securities, Debt Maturities , Remaining Period Remaining contractual maturities Debt Securities, Available-for-Sale, Realized Gain (Loss) Realized gain (loss) recognized on the sale or maturity of available-for-sale Debt Securities, Available-for-Sale, Amortized Cost Amortized Cost Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Gross Unrealized Losses Prepaid Expense, Noncurrent Clinical trial deposits Other Assets, Miscellaneous, Noncurrent Other Carrying value as of the balance sheet date of obligations incurred through that date and payable for external research, development and manufacturing expenses. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Accrued External Research, Development And Manufacturing Expenses, Current External research, development and manufacturing expenses Employee-related Liabilities, Current Employee compensation and benefits Accrued Professional Fees, Current Professional and consultant fees Accrued Income Taxes, Current Income taxes payable Other Accrued Liabilities, Current Other Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Lessee, Lease, Description [Line Items] Leases Lessee, Operating Lease, Term of Contract Lease term Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Maturities of the operating lease liabilities Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year 2025 (remaining nine months) Lessee, Operating Lease, Liability, to be Paid, Year One 2026 Lessee, Operating Lease, Liability, to be Paid, Year Two 2027 Lessee, Operating Lease, Liability, to be Paid Total future minimum lease payments Lessee, Operating Lease, Liability, Undiscounted Excess Amount Less: imputed interest Operating Lease, Liability Total operating lease liabilities Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Represents information pertaining to license agreement with Bristol-Myers Squibb. License Agreement With Bristol Myers Squibb [Member] BMS Agreement Represents information pertaining to Novation Agreement with Tenacia. Novation Agreement [Member] Novation Agreement Represents the member information pertaining to license agreement with Zai Labs (Hong Kong) Limited. License Agreement with Zai Labs (Hong Kong) Limited [Member] License Agreement with Zai Lab (Hong Kong) Limited Represents information pertaining to Viridian Agreement. Viridian Agreement [Member] Viridian Agreement Amount of cash inflow from upfront payment received pursuant to the agreement. Collaborative Arrangement, Upfront Payment, Received Amount of upfront cash payment received Non-refundable upfront fee Amount of receivable from development, regulatory, and sales milestone payments if certain milestones are successfully achieved. Collaborative Arrangement, Development, Regulatory and Sales Milestone Payments, Receivable, Maximum Maximum amount of payments receivable Revenue from Collaborative Arrangement, Excluding Revenue from Contract with Customer Amount of reduction to research and development expenses Amount of receivable in the collaborative arrangement. Collaborative Arrangement, Receivables Amount receivable The amount of development milestone payable in connection with the agreement during the period. License and Option Agreements, Development Milestone Payable Development milestone expense payable Amount of receivable from sales milestone payments if certain milestones are successfully achieved. Collaborative Arrangement, Sales Milestone Payments, Receivable, Maximum Sales milestone payments receivable The amount of transaction price receivable under the collaborative agreement. Collaborative Arrangement, Transaction Price Agreement transaction price Represents information pertaining to 2020 Xencor Agreement. Xencor Agreement 2020 [Member] 2020 Xencor Agreement Represents information pertaining to 2021 Xencor Agreement. Xencor Agreement 2021 [Member] 2021 Xencor Agreement Amount of reimbursable expenses incurred pursuant to the agreement. License and Option Agreements, Reimbursable Expenses Reimbursable costs The amount of regulatory milestone payable in connection with the agreement during the period. License and Option Agreements, Regulatory Milestone Payable Regulatory milestone payments The amount of sales milestone payable in connection with the agreement during the period. License and Option Agreements, Sales Milestone Payable Sales milestone payments The amount of total contract manufacturing organization ("CMO") costs incurred and recognized. License and Option Agreements, Contract Manufacturing Organization Costs Contract manufacturing organization costs recognized Number of votes per share entitled to each holder of common stock. Common Stock, Number Of Votes Per Share Number of votes per share Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Balance outstanding at end of year (in shares) Balance outstanding at beginning of year (in shares) Options to purchase common stock Remaining number of common stock reserved for future issuance. Remaining Common Stock, Capital Shares, Reserved For Future Issuance Remaining shares reserved for future issuance Aggregate number of common shares reserved for future issuance under Employee Stock Purchase Plan. Employee Stock Purchase Plan, Common Shares Reserved for Future Issuance Employee stock purchase plan Common Stock, Capital Shares Reserved for Future Issuance Number of common stock remain available for future grant Total Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Plan Name [Axis] Plan Name [Domain] Represents the information pertaining to 2024 Equity Incentive Plan. Equity Incentive Plan 2024 [Member] 2024 Plan Represents the information pertaining to 2024 Employee Stock Purchase Plan . Employee Stock Purchase Plan 2024 [Member] 2024 ESPP Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Stock-Based Compensation Maximum additional number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock. Share Based Compensation Arrangement by Share-Based Payment Award, Additional shares authorized, Percentage of Outstanding Stock Maximum Maximum additional number of outstanding capital stock percent Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized Increase in common stock available for issuance Maximum number of additional shares to be authorized for issuance under share-based payment arrangement. Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Number of Additional Shares To Be Authorized Additional shares To Be authorized Stock Issued During Period, Shares, Employee Stock Purchase Plans Shares issued under ESPP Options to purchase common stock Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Number of Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period Forfeited or cancelled (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Options vested and exercisable at end of year (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Options vested and expected to vest end of year (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Weighted - Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Balance outstanding at end of year (in dollars per share) Balance outstanding at beginning of year (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Granted (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Exercised (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Forfeited or cancelled (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Options vested and exercisable at end of year (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Options vested and expected to vest at end of year (in dollars per share) No definition available. Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term [Abstract] Weighted-Average Remaining Contractual Term (In years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Balance outstanding at end of year (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Options vested and exercisable at end of year (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Options vested and expected to vest at end of year (in years) No definition available. Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Aggregate Intrinsic Value [Abstract] Aggregate Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Balance outstanding at end of year Balance at beginning of year Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value Exercised Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Options vested and exercisable at end of year Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Options vested and expected to vest at end of year Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Unrecognized compensation cost related to unvested stock options Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Weighted average period over which unrecognized compensation cost is expected to be recognized Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Domain] Research and Development Expense [Member] Research and development General and Administrative Expense [Member] General and administrative Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Stock-Based Compensation Expense Share-Based Payment Arrangement, Expense Stock-based compensation Total stock-based compensation expense Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Numerator: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Denominator: Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Convertible Preferred Stock [Member] Convertible preferred stock Restricted Stock [Member] Unvested restricted stock Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Net Loss Per Share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Anti-dilutive securities excluded from computation of diluted net (loss) per share Contractual Obligation, to be Paid, Year One Contract payment obligation Related Party Transaction [Table] Counterparty Name [Axis] Counterparty Name [Domain] Represents information pertaining to Xencor, Inc. Xencor, Inc [Member] Xencor Represents information pertaining to Viridian Therapeutics, Inc. Viridian Therapeutics, Inc [Member] Viridian Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Domain] Related Party [Member] Related party Legal Entity [Axis] Entity [Domain] Represents the member information pertaining to Fairmount Funds Management LLC. Fairmount Funds Management LLC [Member] Fairmount Funds Management LLC Related Party Transaction [Line Items] Related Party Transactions Number of antibody product candidates for which license has been obtained. Related Party Transaction, Number of Antibody Product License Obtained Number of antibody product candidates Number of license agreements. Related Party Transaction, Number of License Agreements Number of license agreements The percentage of ownership of the entity's common stock by a related party. Ownership Percentage by Related Party Ownership percentage by related party Number of seats held in the board of related entity. Number of Seats Held in Board Number of seats held in board Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Segments [Axis] Segments [Domain] Represents the information pertaining to single reportable segment focused on the research and development of precision immunology-based therapies. Single Reportable Segment [Member] Single Reportable Segment Product and Service [Axis] Product and Service [Domain] Represents the information pertaining to Obexelimab. Obexelimab [Member] Obexelimab Represents the information pertaining to Other Programs (ZB002 & ZB004). Other Programs (ZB002 & ZB004) [Member] Other programs (ZB002 & ZB004) Represents the information pertaining to Partnered regional programs (ZB001 & ZB005). Partnered Regional Programs (ZB001 & ZB005) [Member] Partnered regional programs (ZB001 & ZB005) Represents the information pertaining to unallocated products or services. Unallocated [Member] Unallocated Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Segment Information Segment Reporting, Other Segment Item, Amount Other segment items Segment Reporting, Other Segment Item, Composition, Description Other segment items, description Subsequent Events Subsequent Event [Table] Subsequent Event [Line Items] Subsequent event