Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Statistical Measurement [Domain] Statistical Measurement [Domain] Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss Award Timing Predetermined Award Timing Predetermined [Flag] Remainder of 2026 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Entity File Number Entity File Number Additional Paid-In Capital Additional Paid-in Capital [Member] Tabular List, Table Tabular List [Table Text Block] Recently Issued But Not Yet Adopted Accounting Pronouncements and Legislation New Accounting Pronouncements, Policy [Policy Text Block] Accounts payable Increase (Decrease) in Accounts Payable Debt securities Debt Securities [Member] Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Class of warrant or right, outstanding (in shares) Class of Warrant or Right, Outstanding Aventis Inc. Aventis Inc. [Member] Aventis Inc. Net loss per share attributable to common stockholders, basic (in dollars per share) Net loss per share, basic (in dollars per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Commercial paper Commercial Paper [Member] Shares reserved for future issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Stock, Class of Stock [Table] Stock, Class of Stock [Table] Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Issuance of common stock through employee stock purchase plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Area of real estate property (sqft) Area of Real Estate Property Adjustment to Compensation, Amount Adjustment to Compensation Amount Other assets Increase (Decrease) in Other Operating Assets Non-program expenses Non-Program Expenses Non-Program Expenses Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Options to purchase common stock Employee Stock Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Operating cash flows from short-term leases Short-Term Lease Payments Antidilutive Securities [Axis] Antidilutive Securities [Axis] Total stockholders' equity Beginning balance Ending balance Equity, Attributable to Parent Insider Trading Policies and Procedures [Line Items] Stock-based compensation expense Share-based compensation expense Share-Based Payment Arrangement, Expense Schedule of Property and Equipment, Net Property, Plant and Equipment [Table Text Block] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Shares issued in lieu of common stock (shares) Sales of Stock, Shares Withheld in Lieu of Cash Payments Sales of Stock, Shares Withheld in Lieu of Cash Payments Issuance of common stock under at-the-market offering, net of issuance costs (in shares) Issuance of common stock upon public offering, net of commissions, underwriting discounts and issuance costs (in shares) Stock Issued During Period, Shares, New Issues Current assets: Assets, Current [Abstract] Cancelled (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period Total liabilities and stockholders' equity Liabilities and Equity Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Number of Options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Liabilities and Stockholders' Equity Liabilities and Equity [Abstract] Cover [Abstract] Cover [Abstract] Total cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Maximum Maximum [Member] General and administrative General and Administrative Expense [Member] Accounting Policies [Abstract] Accounting Policies [Abstract] Intangible asset, net Finite-Lived Intangible Assets, Net Schedule of Maturities of the Lease Liabilities Due Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation 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] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Class of Warrant or Right [Axis] Class of Warrant or Right [Axis] Total lease liabilities Operating Lease, Liability Government securities US Government Agencies Debt Securities [Member] Notice period for contract termination Notice Period For Contract Termination Notice period for contract termination. 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Accrued expenses Increase (Decrease) in Accrued Liabilities Net loss per share attributable to common stockholders, diluted (in dollars per share) Net loss per share, diluted (in dollars per share) Earnings Per Share, Diluted Incentive Plan Incentive Plan Represents information pertaining to Stock incentive plan 2015. Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Title of 12(b) Security Title of 12(b) Security Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Aggregate Intrinsic Value Vested and exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Other comprehensive loss: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Abstract] No definition available. Shares sold (in shares) Sale of Stock, Number of Shares Issued in Transaction Earnings Per Share [Abstract] Earnings Per Share [Abstract] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Schedule of Potentially Dilutive Securities that have been Excluded from the Calculation of Diluted Net Loss Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Maximum potential proceeds from the issuance of stock Sale of Stock, Maximum Potential Consideration Receivable on Transaction Sale of Stock, Maximum Potential Consideration Receivable on Transaction Envometinib (IMM-6-415) Envometinib (IMM-6-415) [Member] Envometinib (IMM-6-415) Accrued Expenses Accounts Payable and Accrued Liabilities Disclosure [Text Block] Office Space in Cambridge, Massachusetts, and New York Office Space In Cambridge, Massachusetts, New York [Member] Office Space In Cambridge, Massachusetts, New York Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Deferred offering costs Deferred Offering Costs Weighted Average Exercise Price per Share Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Award Timing Disclosures [Line Items] Exercise price (in dollars per share) Weighted Average Exercise Price per Share Granted (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Property and Equipment, net Property, Plant and Equipment Disclosure [Text Block] Total future lease payments Lessee, Operating Lease, Liability, to be Paid Common Stock Equity [Text Block] Net loss Net loss Net loss Net loss Net Income (Loss) Attributable to Parent Organization and Nature of Business Subsidiary or Equity Method Investee [Line Items] At-the-market offering At The Market Offering [Member] Represents information relating to at the market offering. Expiration Date Trading Arrangement Expiration Date Long-term liabilities: Liabilities, Noncurrent [Abstract] Construction in progress Construction in Progress [Member] Other liabilities Increase (Decrease) in Other Operating Liabilities Vesting period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Property and equipment, net Property and equipment, net Property, Plant and Equipment, Net Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Adoption Date Trading Arrangement Adoption Date Weighted Average Remaining Contractual Term, Vested and exercisable (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Entity Current Reporting Status Entity Current Reporting Status Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Loss from operations Operating Income (Loss) Accumulated deficit Retained Earnings (Accumulated Deficit) Schedule of Recognized Share-based Compensation Expense Recognized Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] 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] Executive Category: Executive Category [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Class of Stock [Axis] Class of Stock [Axis] Expected term (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term 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] Share unfunded exercise price (in dollars per share) Share Unfunded Exercise Price Share Unfunded Exercise Price Other income, net Other Nonoperating Income (Expense) Statement [Table] Statement [Table] Adjustment to reconcile to net loss to net cash used in operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Grant date weighted average 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 Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Cash paid for amounts included in the measurement of lease liabilities: Operating Lease, Additional Information [Abstract] No definition available. Maturities of marketable securities Proceeds from Sale and Maturity of Marketable Securities Organization and Nature of Business Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Total shares of common stock equivalents (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag Sale of stock (in dollars per share) Sale of Stock, Price Per Share Termination Date Trading Arrangement Termination Date Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Weighted-average discount rate - operating leases (as a percent) Operating Lease, Weighted Average Discount Rate, Percent Schedule of Stock Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Pre Funded Warrants Pre Funded Warrants [Member] Pre Funded Warrants Schedule of Cash Equivalents and Marketable Securities Fair Value, Assets Measured on Recurring Basis [Table Text Block] Weighted-average common shares outstanding, basic (in shares) Weighted Average Number of Shares Outstanding, Basic Schedule of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Segment Reporting [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Vested Repriced Option Vested Repriced Option [Member] Vested Repriced Option Entity Tax Identification Number Entity Tax Identification Number Weighted Average Exercise Price per Share Outstanding at the beginning (in dollars per share) Weighted Average Exercise Price per Share Outstanding at the ending (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par value per share (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares issued (in shares) Common Stock, Shares, Issued Weighted-average remaining lease term - operating leases (in years) Operating Lease, Weighted Average Remaining Lease Term Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Total lease payment Lease Payments Total cash paid towards operating lease payment including short term lease payment. Use of Estimates Use of Estimates, Policy [Policy Text Block] Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Total liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Marketable securities Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Operating expenses Operating Expenses [Abstract] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Other liabilities Other Liabilities, Current Accrued other expenses Other Sundry Liabilities, Current Issuance of common stock under at-the-market offering, net of issuance costs Stock Issued During Period, Value, New Issues Statement [Line Items] Statement [Line Items] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Counterparty Name [Axis] Counterparty Name [Axis] Weighted-average risk-free interest rate, maximum (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Common Stock Common Stock [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Reduction in offer price, of income capacity Sales Of Stock , Value, Increase (Decrease) in Maximum Offering Sales Of Stock , Value, Increase (Decrease) in Maximum Offering Net decrease in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Accrued professional services Accrued Professional Fees, Current Common Stock Warrants Common Stock Warrants [Policy Text Block] Common Stock Warrants