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 Subsequent Event Subsequent Event [Member] 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 Adjustment to Compensation, Amount Adjustment to Compensation Amount Customer [Axis] Customer [Axis] Segment Reporting [Abstract] Preclinical & development expenses Preclinical & Development Expenses [Member] Preclinical & Development Expenses 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 June 30, 2026 and December 31, 2025; 40,953,948 shares issued and 19,827,188 shares outstanding as of June 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 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shares as of June 30, 2026 and December 31, 2025 Treasury Stock, Common, Value 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, Liability, Current INCOME (LOSS) PER SHARE Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name 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 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[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] Subsequent Event [Table] Subsequent Event [Table] 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 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 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] No trading symbol No Trading Symbol Flag 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 June 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] 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 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] 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]