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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 provided by 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] Equity Distribution Agreement Equity Distribution Agreement [Member] Equity distribution agreement. Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Debt instrument face amount Debt Instrument, Face Amount Contract assets Increase (Decrease) in Contract with Customer, Asset 2028 Lessee, Operating Lease, Liability, to be Paid, Year Two Required milestone payments Required Milestone Payments Required Milestone Payments Security Exchange Name Security Exchange Name Contract liabilities: Deferred revenue Change in Contract with Customer, Liability [Roll Forward] Change in Contract with Customer, Liability Treasury Stock, at cost (10.0 shares as of June 30, 2026 and December 31, 2025) Treasury Stock, Common, Value Granted (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Rigel Pharmaceuticals, Inc. Rigel Pharmaceuticals, Inc. [Member] Rigel Pharmaceuticals, Inc. 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Cancelled/ Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Cancelled/ 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) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Diluted (in dollars per share) Net loss per common share, diluted (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Expected volatility, maximum (percentage) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Total Shareholder Return Amount Total Shareholder Return Amount Pfizer Collaboration Agreement Pfizer Collaboration Agreement [Member] Pfizer Collaboration Agreement Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Collaboration liability Collaboration Liability, Noncurrent Collaboration Liability, Noncurrent Payments made Accounts Payable, Contract Balances, Current Payments Accounts Payable, Contract Balances, Current Payments Common stock aggregate offering price Maximum Aggregate Offering Price Of Common Stock Maximum aggregate offering price of common stock. 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Additional Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Director Director [Member] Name Trading Arrangement, Individual Name Consideration payable Consideration Payable Under Collaboration Agreement Consideration Payable Under Collaboration Agreement Cash and cash equivalents Cash and Cash Equivalent Consulting Agreement, Lump Sum Payment Consulting Agreement, Lump Sum Payment [Member] Consulting Agreement, Lump Sum Payment Company Selected Measure Amount Company Selected Measure Amount Total intrinsic value of RSUs released Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options, Aggregate Intrinsic Value, Released In Period Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options, Aggregate Intrinsic Value, Released In Period Entity Address, Address Line Two Entity Address, Address Line Two Issuance of common stock under equity incentive plans (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Laboratory equipment Laboratory Equipment [Member] Laboratory equipment. At-the-Market Offering At The Market Offering [Member] At the market offering. Current assets: Assets, Current [Abstract] Operating lease, weighted average remaining lease term (in years) Operating Lease, Weighted Average Remaining Lease Term Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Right-of-use assets obtained in exchange for new lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Vested (in dollars 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 (expense) benefit Income tax (expense) benefit Income tax expense (benefit) Income Tax Expense (Benefit) Award Timing Method Award Timing Method [Text Block] Net (decrease) increase in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Other research and development expense Other Research and Development Expense Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Number Of Authorized Shares Not Disclosed Number Of Authorized Shares Not Disclosed Number Of Authorized Shares Not Disclosed Expected volatility, minimum (percentage) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Net income (loss) Net income (loss) Net income Segment net income (loss) Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Earnings (loss) per common share Earnings (Loss) Per Common Share, EPS [Abstract] Earnings (Loss) Per Common Share, EPS Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Interest income, net Interest income, net Investment Income, Interest Vested and exercisable (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Schedule of Contract Balances Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Revenue Revenues [Abstract] Accrued liabilities Accrued Liabilities [Abstract] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]