Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Performance Based Awards Performance Based Awards [Member] Performance Based Awards Title of 12(b) Security Title of 12(b) Security Repurchase of treasury stock Treasury Stock, Acquired, Commissions Treasury Stock, Acquired, Commissions Net income (loss) attributable to common stockholders - diluted Net income (loss) attributable to common stockholders - diluted Net Income (Loss) Available to Common Stockholders, Diluted Document Fiscal Year Focus Document Fiscal Year Focus Takeda Pharmaceuticals U.S.A., Inc. Takeda Pharmaceuticals U.S.A., Inc. [Member] Takeda Pharmaceuticals U.S.A., Inc. Total duration of consecutive and overlapping offering periods Share Based Compensation Arrangement by Share Based Payment Award, Consecutive and Overlapping Offering Period Share Based Compensation Arrangement by Share Based Payment Award, Consecutive and Overlapping Offering Period Nonclinical & development expenses Nonclinical & Development Expenses [Member] Nonclinical & Development Expenses Adjustment to Compensation, Amount Adjustment to Compensation Amount Number of Units Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Customer [Axis] Customer [Axis] Segment Reporting [Abstract] Restructuring Plan [Axis] Restructuring Plan [Axis] Tech Transfer Agreement Tech Transfer Agreement [Member] Tech Transfer Agreement Common stock, par value of $0.0001 per share; 200,000,000 shares authorized as of September 30, 2026 and December 31, 2025; 41,103,773 shares issued and 19,830,671 shares outstanding as of September 30, 2026 and 40,670,466 shares issued and 19,543,706 shares outstanding as of December 31, 2025 Common Stock, Value, Issued Accrued compensation and benefits Employee-related Liabilities, Current Risks and Uncertainties Risk and Uncertainties [Policy Text Block] Risk and Uncertainties Repurchases of treasury stock in accrued expenses Repurchases Of Treasury Stock In Accrued Expenses Repurchases Of Treasury Stock In Accrued Expenses Restatement Determination Date Restatement Determination Date Vesting of restricted stock (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Schedule of Prepaid Expenses and Other Current Assets Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] Amendment Flag Amendment Flag CURRENT LIABILITIES: Liabilities, Current [Abstract] Shares acquired, average cost per share (in USD per share) Shares Acquired, Average Cost Per Share Entity Common Stock, Shares 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Reporting Segment Reporting [Table Text Block] Gain on disposal of fixed asset Gain (Loss) on Disposition of Property Plant Equipment Schedule of of Accrued Expenses and Other Current Liabilities Schedule of Accrued Liabilities [Table Text Block] LESS: Segment Reporting, Reconciliation [Abstract] Development milestone payment received Collaborative Arrangement, Consideration Received Collaborative Arrangement, Consideration Received Document Period End Date Document Period End Date 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] 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] Compensation costs (excluding stock based compensation) Compensation Expense, Excluding Cost of Good and Service Sold Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding STOCKHOLDERS' EQUITY Equity [Text Block] Security Exchange Name Security Exchange Name Treasury stock, at cost; 21,273,102 shares as of September 30, 2026 and 21,126,760 shares as of December 31, 2025 Treasury Stock, Common, Value Esther Cho [Member] Esther Cho Granted (in USD per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Aggregate fair value of restricted shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Entity Shell Company Entity Shell Company Number of shares authorized (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Current portion of operating lease liabilities Operating Lease, 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[Domain] Sale of Stock [Domain] Income Tax Disclosure [Abstract] Payment of direct expenses associated with the treasury stock repurchase Payment of Stock Repurchase Costs Payment of Stock Repurchase Costs CASH FLOWS FROM OPERATING ACTIVITIES: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Weighted-average shares of common stock outstanding — diluted (in shares) Weighted-average shares of common stock outstanding used to compute diluted net loss (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Research and Development Arrangement, Contract to Perform for Others, Type [Domain] Research and 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Stock Units (RSUs) [Member] Schedule of Antidilutive Securities Excluded From Computation of Diluted Net Loss Per Share 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] Hansoh Shanghai Healthtech Co Ltd Hansoh Shanghai Healthtech Co Ltd [Member] Hansoh Shanghai Healthtech Co Ltd 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 provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Income Statement [Abstract] STOCKHOLDERS' EQUITY: Equity, Attributable to Parent [Abstract] Issuance of common stock under the employee stock purchase plan 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expense Operating Lease, Right-of-Use Asset, Periodic Reduction Name Forgone Recovery, Individual Name Unvested award, period for recognition Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] 2020 Plan 2020 Stock Incentive Plan [Member] 2020 Stock Incentive Plan Statement [Line Items] Statement [Line Items] TOTAL ASSETS Assets Right-of-use assets and operating lease liabilities Right-to-Use Assets and Operating Lease Liabilities Right-to-Use Assets and Operating Lease Liabilities Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Common stock, reserved for future issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Annual percentage increase in shares authorized Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase In Shares Authorized, Percentage Share-based Compensation Arrangement by 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portion Operating Lease, Liability, Noncurrent Total operating expenses Operating Expenses Forfeited (in USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Series A Preferred Stock Series A Preferred Stock [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Cancelled or Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Net income (loss) per share of common stock — diluted (in USD per share) Diluted (in USD per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Net cash 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Consideration Schedule of Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] WEIGHTED-AVERAGE EXERCISE PRICE Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Common stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Share based compensation arrangement by share based payment award purchase period Share Based Compensation Arrangement by Share Based Payment Award, Purchase Period Share Based Compensation Arrangement by Share Based Payment Award, Purchase Period Treasury stock, at cost (in shares) Beginning balance (in shares) Ending balance (in shares) Treasury Stock, Common, Shares Term Loan Credit Agreement Three Amendment Term Loan Credit Agreement Three Amendment [Member] Term Loan Credit Agreement Three Amendment 2025 Restructuring 2025 Restructuring [Member] 2025 Restructuring Equity Components [Axis] Equity Components [Axis] Accounts receivable Increase (Decrease) in Accounts Receivable Product and Service [Domain] Product and Service [Domain] Class of Stock [Line Items] Class of Stock [Line Items] Cash paid for taxes Income Tax Paid, after Refund Received Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Repurchase of treasury stock, net of commissions Treasury Stock, Value, Acquired, Cost Method, Net Of Commissions Treasury Stock, Value, Acquired, Cost Method, Net Of Commissions Entity Interactive Data Current Entity Interactive Data Current Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Small Business Entity Small Business Termination Date Trading Arrangement Termination Date 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] Other Other Liabilities, Current Contractual term Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Other long-term assets Other Assets, Noncurrent Document Type Document Type Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Accrued expenses and other current liabilities Total accrued expenses and other current liabilities Accrued Liabilities, Current Fair Value as of Grant Date Award Grant Date Fair Value Potential milestone payments, sales-based milestones Potential Milestone Payments, Sales-based Milestones Potential Milestone Payments, Sales-based Milestones SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Julius Knowles [Member] Julius Knowles Options exercisable, value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Share repurchase program, remaining authorized, amount Share Repurchase Program, Remaining Authorized, Amount Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Total revenue from Takeda Revenues Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] 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] Other external costs Other External Costs [Member] Other External Costs Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Expired (in shares) Expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Accrued external R&D costs Accrued Research And Development Costs, Current Accrued Research And Development Costs, Current Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair 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treasury stock, including commissions Repurchase of treasury stock, including commissions Treasury Stock, Value, Acquired, Cost Method Cash payments Payments for Restructuring Exercised (in USD per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price 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 Accrued legal and consulting fees Accrued Professional Fees, Current Accounts payable Increase (Decrease) in Accounts Payable 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] NATURE OF BUSINESS AND BASIS OF PRESENTATION Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Debt Instrument [Axis] Debt Instrument [Axis] Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Purchase price as a percentage of fair market value of stock Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent Effect of potentially dilutive employee stock purchase plan shares Employee stock purchase plan shares Employee Stock [Member] Customer [Domain] Customer [Domain] Term of the TSA Investment Company, Fee Waiver Terms Net income (loss) per share of common stock — basic (in USD per share) Basic (in USD per share) Earnings Per Share, Basic Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Repurchase of treasury stock Repurchase of treasury stock Payments for Repurchase of Common Stock Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Award Type [Axis] Award Type [Axis] Accrued external manufacturing costs Accrued Manufacturing Costs, Current Accrued Manufacturing Costs, Current Nima Farzan [Member] Nima Farzan Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current Accumulated deficit Retained Earnings (Accumulated Deficit) Restructuring and Related Activities [Abstract] Product and Service [Axis] Product and Service [Axis] Restricted cash Restricted Cash, Noncurrent 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 Common Stock [Member] Prepaid external R&D costs Prepaid External R&D Costs, Current Prepaid External R&D Costs, Current Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Number of positions eliminated (as a percent) Restructuring and Related Cost, Number of Positions Eliminated, Period Percent Equity Awards Adjustments Equity Awards Adjustments [Member] Prepaid external manufacturing costs Prepaid External Manufacturing Costs, Current Prepaid External Manufacturing Costs, Current TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity License agreement upfront fee License Agreement Upfront Fee License Agreement Upfront Fee Employee stock option Effect of potentially dilutive stock options Options to purchase common stock Share-Based Payment Arrangement, Option [Member] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Expenses incurred Restructuring Charges Weighted-Average Grant-Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Plan Name [Axis] Plan Name [Axis] Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Other expense, net Other Nonoperating Income (Expense) Share based compensation arrangement by share based payment award, annual increase percent of shares outstanding Share Based Compensation Arrangement by Share Based Payment Award, Annual Increase Percent of Shares Outstanding Share Based Compensation Arrangement by Share Based Payment Award, Annual Increase Percent of Shares Outstanding Current income tax receivable Income Taxes Receivable, Current 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] Options outstanding, value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period General and administrative General and Administrative Expense Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, par value of $0.0001 per share; 10,000,000 shares authorized as of September 30, 2026 and December 31, 2025; no shares issued and outstanding Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Revenue, remaining performance obligation, development milestones, variable consideration Revenue, Remaining Performance Obligation, Development Milestones, Variable Consideration Revenue, Remaining Performance Obligation, Development Milestones, Variable Consideration Class of Stock [Domain] Class of Stock [Domain] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] At The Market Sales Agreement At The Market Sales Agreement [Member] At The Market Sales Agreement CORPORATE RESTRUCTURING Restructuring and Related Activities Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total financial assets Assets, Fair Value Disclosure 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] 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 equivalents Cash and Cash Equivalent Company Selected Measure Amount Company Selected Measure Amount Withholding taxes from upfront fee Revenue From Contract With Customer, Withholding Taxes Revenue From Contract With Customer, Withholding Taxes Entity Address, Address Line Two Entity Address, Address Line Two Schedule of Stock by Class [Table] Stock, Class of Stock [Table] CURRENT ASSETS: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Vested (in USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Income tax (provision) benefit Income tax (provision) benefit Income Tax Expense (Benefit) Research and Development Arrangement, Contract to Perform for Others, Type [Axis] Research and Development Arrangement, Contract to Perform for Others, Type [Axis] Purchase obligation Purchase Obligation Award Timing Method Award Timing Method [Text Block] NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] License revenue License revenue [Member] License revenue Net income (loss) Net income (loss) Net income (loss) Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Proceeds from exercise of stock options Proceeds from Stock Options Exercised Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Interest income, net Investment Income, Interest Exercisable (in USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price REVENUE: Revenues [Abstract] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Numerator: Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]