Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Royalty obligation rate (as a percent) Royalty Obligation, Rate Royalty Obligation, Rate Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Title of 12(b) Security Title of 12(b) Security Document Fiscal Year Focus Document Fiscal Year Focus Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] Customer [Axis] Customer [Axis] Segment Reporting [Abstract] Schedule of Fair Value Hierarchy of Financial Assets Measured at Fair Value Fair Value, Assets Measured on Recurring Basis [Table Text Block] Common stock $0.001 par value per share, 1,500,000,000 shares authorized as of September 30, 2026 and December 31, 2025 and 44,753,179 and 40,331,360 shares issued and outstanding as of September 30, 2026 and December 31, 2025 Common Stock, Value, Issued 2027 Lessee, Operating Lease, Liability, to be Paid, Year One Accrued compensation expenses Employee-related Liabilities, Current Entity Ex Transition Period Entity Ex Transition Period Restatement Determination Date Restatement Determination Date Release of restricted stock units (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Allowance for credit losses Accounts Receivable, Allowance for Credit Loss Amendment Flag Amendment Flag Current liabilities: Liabilities, Current [Abstract] Credit loss expense Accounts Receivable, Credit Loss Expense (Reversal) Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Operating lease right-of-use assets and liabilities, net Increase (Decrease) In Operating Lease Right-Of-Use Assets And Liabilities, Net Increase (Decrease) In Operating Lease Right-Of-Use Assets And Liabilities, 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Return Amount Peer Group Total Shareholder Return Amount Issuance of common stock under ESPP Proceeds from Stock Plans Receivable [Domain] Receivable [Domain] Level 2 Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Revenue Benchmark Revenue Benchmark [Member] United States UNITED STATES Concentration Risk Type [Axis] Concentration Risk Type [Axis] Subsidiary or Equity Method Investee, Sale of Stock, Type [Table] Subsidiary or Equity Method Investee, Sale of Stock, Type [Table] Recently Adopted Accounting Pronouncements and Recently Issued Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Property and equipment included in accounts payable and accrued liabilities Capital Expenditures Incurred but Not yet Paid Schedule of Segment Reporting Information Segment Reporting [Table 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Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Building Building [Member] Nonrelated Party Nonrelated Party [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Other income: Other income (expense): Other Income and Expenses [Abstract] Proceeds from issuance of common stock in connection with the Samsung SPA, net of issuance costs Proceeds from Issuance of Common Stock Common stock, shares authorized (in shares) Common Stock, Shares Authorized Net loss per share Earnings Per Share Reconciliation [Abstract] Number of common stock sold (in shares) Sale of Stock, Number of Shares Issued in Transaction Exercise Price Award Exercise Price Cash flows from investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Release of restricted stock units Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Remaining lease term (in years) 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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] 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 used in operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Accounts Receivable Accounts Receivable [Member] LEGAL PROCEEDINGS, COMMITMENTS, AND CONTINGENCIES Legal Matters and Contingencies [Text Block] Income Statement [Abstract] Issuance of common stock under ESPP (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Document Transition Report Document Transition Report Ownership [Axis] Ownership [Axis] Proceeds from maturities of marketable securities Proceeds From Maturities Of Marketable Securities Proceeds From Maturities Of Marketable Securities Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] City Area Code City Area Code Accumulated Other Comprehensive Income/(Loss) AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Development services revenue Development Services Developmental Services Revenue [Member] Developmental Services Revenue Name Forgone Recovery, Individual Name 2031 and thereafter Lessee, Operating Lease, Liability, To Be Paid, After Year Four Lessee, Operating Lease, Liability, To Be Paid, After Year Four Reduction in royalty rate (as a percent) Royalty Obligation, Rate After Monetary Threshold Reached Royalty Obligation, Rate After Monetary Threshold Reached Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Statement [Line Items] Statement [Line Items] Total assets Assets Entity [Domain] Entity [Domain] Accounts Receivable, Net Accounts Receivable [Policy Text Block] Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Issuance of common stock under ESPP Stock Issued During Period, Value, Employee Stock Purchase Plan Deferred assets Deferred Assets, Policy [Policy Text Block] Deferred Assets, Policy Issuance of common stock and recognition of the Samsung Stock Purchase Agreement, including the deferred asset, net of tax benefit and issuance costs (in shares) Stock Issued During Period, Shares, New Issues PEO PEO [Member] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense Stock-based compensation Share-Based Payment Arrangement, Expense Other non-current liabilities Other Liabilities, Noncurrent One Customer One Customer [Member] One Customer Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Number of marketable securities in an unrealized loss position Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Issuance of common stock pursuant to exercise of performance stock options (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Accumulated Deficit Retained Earnings [Member] Operating lease liabilities, net of current portion Operating Lease, Liability, Noncurrent Money market funds Money Market Funds [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] 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] Net loss per share—Diluted (in dollars per share) Diluted (in dollars per share) Earnings Per Share, Diluted Grail, Inc. Grail, Inc. [Member] Grail, Inc. Entity Current Reporting Status Entity Current Reporting Status Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Cost of revenue — amortization of intangible assets Intangible Asset, Finite-Lived, Amortization Expense Ownership [Domain] Ownership [Domain] Research and development Research and development Operating expenses—Research and development Research and Development Expense Adjustments to reconcile net loss to net cash used by 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] Total revenue Revenue from Contract with Customer, Excluding Assessed Tax Property and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Financial Instruments [Domain] Financial Instruments [Domain] Numerator Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Issuance of common stock pursuant to exercise of performance stock options Stock Issued During Period, Value, Stock Options Exercised Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount REVENUE Revenue from Contract with Customer [Text Block] Issuance of common stock and recognition of the Samsung Stock Purchase Agreement, including the deferred asset, net of tax benefit and issuance costs Stock Issued During Period, Value, New Issues Lessor, operating lease, renewal term Lessee, Operating Lease, Number Of Options To Renew Lessee, Operating Lease, Number Of Options To Renew Incremental borrowing rate (as a percent) Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Segment Reporting [Table] Segment Reporting [Table] Commitments and contingencies, number of movants filed motions consolidate actions Commitments And Contingencies, Number Of Movants Filed Motions Consolidate Actions Commitments And Contingencies, Number Of Movants Filed Motions Consolidate Actions Related Party Transaction [Table] Related Party Transaction [Table] Sale of Stock [Axis] Sale of Stock [Axis] Schedule of Components of Lease Cost Lease, Cost [Table Text Block] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Loss from operations Operating Income (Loss) Current Fiscal Year End Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date 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[Table] Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Number of patents allegedly violated Loss Contingency, Patents Allegedly Infringed, Number Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] 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 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] Reportable Segment Reportable Segment [Member] Reportable Segment 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] Receivable Type [Axis] Receivable Type [Axis] Counterparty Name [Axis] Counterparty Name [Axis] Costs and operating expenses: Operating Costs and Expenses [Abstract] Liabilities and stockholders’ equity Liabilities and Equity [Abstract] All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Remainder of 2026 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year FAIR VALUE MEASUREMENTS, CASH EQUIVALENTS AND MARKETABLE SECURITIES Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Supplies Increase (Decrease) in Materials and Supplies Share price (in dollars per share) Share Price Initial term of lease (in years) Lessee, Operating Lease, Term of Contract PEO Name PEO Name Geographical [Axis] Geographical [Axis] Leasehold improvements Leasehold Improvements [Member] Restricted cash Restricted Cash Total Cash, Cash Equivalents, and Short-Term Investments Long-Lived Asset, Class [Axis] Long-Lived Asset, Class [Axis] Concentration of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Legal Entity [Axis] Legal Entity [Axis] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Cash, cash equivalents and restricted cash — beginning of period Cash, cash equivalents and restricted cash — end of period Total Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Accrued legal and professional service expenses Accrued Professional Fees, Current Accounts payable Increase (Decrease) in Accounts Payable Accrued other expenses Other Accrued Liabilities, Current 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] ORGANIZATION AND DESCRIPTION OF BUSINESS Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Total lease costs Lease, Cost Customer [Domain] Customer [Domain] LEASES Lessee, Operating Leases [Text Block] Net loss per share—Basic (in dollars per share) Basic (in dollars per share) Earnings Per Share, Basic Shares issuable under ESPP Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan Grant date fair value Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Fair Value Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Fair Value Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable, net Total accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Accumulated deficit Retained Earnings (Accumulated Deficit) 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] Illumina, Inc. Illumina, Inc. [Member] Illumina, Inc. Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Facilities And Equipment Facilities And Equipment [Member] Facilities And Equipment Operating lease costs Operating Lease, Cost Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Cover [Abstract] Reclassification Reclassification, Comparability Adjustment [Policy Text Block] International Non-US [Member] Concentration risk, percentage Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Equity Awards Adjustments Equity Awards Adjustments [Member] Total liabilities and stockholders’ equity Liabilities and Equity Variable lease costs Variable Lease, Cost Employee Stock Option Share-Based Payment Arrangement, Option [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Related and Nonrelated Parties [Domain] Related and Nonrelated Parties [Domain] Schedule of Accounts Receivable, Net Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Other income (expense), net Other income (expense), net Other Nonoperating Income (Expense) Name Awards Close in Time to MNPI Disclosures, Individual Name Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items] Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items] 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] General and administrative General and administrative General and Administrative Expense Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Common stock, price per share sold (in dollar per share) Sale of Stock, Price Per Share Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, par value of $0.001 per share; 50,000,000 shares authorized, no shares issued and outstanding as of September 30, 2026 and December 31, 2025 Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Short-term marketable securities Total short-term marketable securities Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Balance Sheet Components [Abstract] Balance Sheet Components Number of class action complaints Loss Contingency, Class Action Complaints, Number Loss Contingency, Class Action Complaints, Number Name Measure Name TAXES Income Tax Disclosure [Text Block] Cash and Cash Equivalent [Table] Cash and Cash Equivalent [Table] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other Other Noncash Income (Expense) Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Unrealized loss position Debt Securities, Available-for-Sale, Unrealized Loss Position Supplemental cash flow information: Supplemental Cash Flow Elements [Abstract] Schedule of Calculation of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table Text Block] Accrued liabilities Accrued Liabilities Name Trading Arrangement, Individual Name Cash and cash equivalents Cash equivalents in money market accounts Cash deposits and cash equivalents Cash and Cash Equivalent Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Depreciation and intangible assets amortization Depreciation, Depletion and Amortization Amortization of discount on marketable securities Investment Income, Net, Amortization of Discount and Premium Entity Address, Address Line Two Entity Address, Address Line Two Accounts and Financing Receivables [Table] Accounts and Financing Receivables [Table] Current assets: Assets, Current [Abstract] Weighted-average remaining lease term 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 operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Benefit from income taxes Benefit from income taxes Income Tax Expense (Benefit) Number of financial institutions Number Of Financial Institutions Number Of Financial Institutions Customer Concentration Risk Customer Concentration Risk [Member] Cost of revenue Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Basis of Presentation and Principles of Consolidation Consolidation, Policy [Policy Text Block] Net 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] Payments for royalties Royalty Obligation, Rate Reduction Monetary Threshold Royalty Obligation, Rate Reduction Monetary Threshold Net loss Net 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 performance stock options Proceeds from Stock Options Exercised Screening revenue Screening Revenue [Member] Screening Revenue Interest income Interest income Investment Income, Interest Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Revenue: Revenues [Abstract] Less: Tenant improvement allowance* Lessee, Operating Lease, Liability, Tenant Improvements Lessee, Operating Lease, Liability, Tenant Improvements Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]