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Reconciliation, Recurring Basis, Liability, Issuances Change in fair value of warrant liabilities for Series B-1 and Series D redeemable convertible preferred stock Change in fair value of warrant liabilities for Series B-1 and Series D redeemable convertible preferred stock Change in fair value of Private warrant liability Fair Value Adjustment of Warrants Other comprehensive loss: Other Comprehensive Income (Loss), Net of Tax [Abstract] Jason Duva [Member] Jason Duva RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Valuation approach and technique concentration (in percent) Valuation Approach And Technique, Concentration, Percent Valuation Approach And Technique, Concentration, Percent Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Property, Plant, and Equipment [Abstract] Entity Address, State or Province Entity Address, State or Province Grants in period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent PEO Total Compensation Amount PEO Total Compensation Amount Building Fixtures Building Fixtures [Member] Building Fixtures Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Assets: Assets, Fair Value Disclosure [Abstract] Valuation Approach Technique, Scenario Based Method Valuation Approach Technique, Scenario Based Method [Member] Valuation Approach Technique, Scenario Based Method Weighted-average common stock outstanding - basic (in shares) Weighted average number of common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Warrant Liabilities Derivative Liability [Member] Derivative Liability Accrued transaction costs Accrued Transaction Costs, Current Accrued Transaction Costs, Current Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Number of reportable segments Number of Reportable Segments Total current liabilities Liabilities, Current Series B-1 redeemable convertible preferred stock Series B-1 Redeemable Convertible Preferred Stock [Member] Series B-1 Redeemable Convertible Preferred Stock Convertible promissory notes – related parties, at fair value Convertible Debt, Noncurrent Conversion of warrant liabilities for Series B-1 and Series D into Series A Common Stock Conversion Of Warrant Liabilities For Common Stock Conversion Of Warrant Liabilities For Common Stock Entity Address, City or Town Entity Address, City or Town Remaining contractual term Measurement Input, Remaining Contractual Term [Member] Measurement Input, Remaining Contractual Term Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Statement of Financial Position [Abstract] Document Information [Line Items] Document Information [Line Items] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Class of Stock [Axis] Class of Stock [Axis] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Net loss attributable to common stockholders - basic Net Income (Loss) Available to Common Stockholders, Basic Dissolution Scenario Measurement Input, Dissolution Scenario [Member] Measurement Input, Dissolution Scenario Level 2 Fair Value, Inputs, Level 2 [Member] Other income (expense), net: Nonoperating Income (Expense) [Abstract] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Redemption, 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Loss (gain) on disposal of property and equipment Gain (Loss) on Disposition of Property Plant Equipment Use of Estimates Use of Estimates, Policy [Policy Text Block] Reclassification of warrant liability for Series A Common Stock from equity Reclassification Of Warrant Liability From Equity Reclassification Of Warrant Liability From Equity Financing costs related to issuance of convertible promissory notes Amortization of Debt Issuance Costs Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Axis] Schedule of Accrued Expenses Schedule of Accrued Liabilities [Table Text Block] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Exercise price (in usd per share) Class of Warrant or Right, Exercise Price of Warrants or Rights PROPERTY AND EQUIPMENT Property, Plant, and Equipment [Text Block] Proceeds received from reverse 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Company Entity Shell Company Series B Common stock Common Class B [Member] Change in fair value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Operating lease liabilities, current portion Operating Lease, Liability, Current Issued for services (in shares) Stock Issued During Period, Shares, Issued for Services Property, Plant, and Equipment Property, Plant, and Equipment [Table Text Block] Expected dividends Measurement Input, Expected Dividend Payment [Member] NET LOSS PER COMMON 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 [Text Block] Total liabilities Liabilities Trading Symbol Trading Symbol Discount rate Measurement Input, Discount Rate 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Legacy Factorial Common Stock Shareholders [Member] Legacy Factorial Common Stock Shareholders Diluted EPS: Earnings Per Share, Diluted [Abstract] Redeemable convertible preferred stock, liquidation preference Temporary Equity, Liquidation Preference Redemption, threshold trading days Class Of Warrant Or Right, Redemption, Threshold Trading Days Class Of Warrant Or Right, Redemption, Threshold Trading Days Legacy Factorial Preferred Stock Shareholders Legacy Factorial Preferred Stock Shareholders [Member] Legacy Factorial Preferred Stock Shareholders Related Party Transactions [Abstract] Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Mercedes-Benz Mercedes-Benz [Member] Mercedes-Benz Convertible Promissory Notes, Fair Value Debt, Policy [Policy Text Block] Receivables under collaboration agreements (includes $0 and $1,000 as related party as of June 30, 2026, and December 31, 2025, respectively) 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[Axis] Issuance of common stock in connection with reverse recapitalization and PIPE Financing, net of issuance costs (in shares) Total (in shares) Stock Issued During Period, Shares, Reverse Recapitalization Stock Issued During Period, Shares, Reverse Recapitalization Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Siyu Huang [Member] Siyu Huang Other non-current assets Increase (Decrease) in Other Noncurrent Assets Deferred Transaction Costs Deferred Charges, Policy [Policy Text Block] Accumulated depreciation Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization Award Timing Predetermined Award Timing Predetermined [Flag] Converted instrument, issued prior to exchange ratio (in shares) Debt Conversion, Converted Instrument, Shares Issued, Prior To Exchange Ratio Debt Conversion, Converted Instrument, 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Increase (Decrease) in Operating Lease Liability Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Preferred stock, par value (in usd per share) Preferred Stock, Par or Stated Value Per Share Class of Warrant or Right [Line Items] Class of Warrant or Right [Line Items] Depreciation expense Depreciation expense Depreciation Antidilutive Securities [Axis] Antidilutive Securities [Axis] The following table presents the Company’s cash, cash equivalents and restricted cash by category in the Company’s Condensed Consolidated Balance Sheets: Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation [Abstract] Operating lease right-of-use assets, net Operating Lease, Right-of-Use Asset Threshold proceeds Debt Instrument, Convertible, Threshold Proceeds from Convertible Debt Debt Instrument, Convertible, Threshold Proceeds from Convertible Debt Temporary Equity Temporary Equity [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] SEGMENT INFORMATION Segment Reporting [Text Block] Expiration Date Trading Arrangement Expiration Date Class of Warrant or Right [Axis] Class of Warrant or Right [Axis] Denominator: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Effects of exchange rate change on cash, cash equivalents and restricted cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Location, Statement of Income, Balance [Axis] Location, Statement of Income, Balance [Axis] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Money market (included in cash and cash equivalents) Cash and Cash Equivalents, Fair Value Disclosure Cantor Advisory Fee Cantor Advisor [Member] Cantor Advisor 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] Buildings Building [Member] Money market (included in restricted cash) Restricted Cash, Fair Value Disclosure Restricted Cash, Fair Value Disclosure Nonrelated Party Nonrelated Party [Member] Reclassification of Warrant liability for Series A Common Stock from equity to liability Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Reclassification Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Reclassification Convertible promissory notes – related parties Convertible Debt, Fair Value Disclosures Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Common stock, authorized (in shares) Common Stock, Shares Authorized Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Issued and 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] Related Party Transaction [Axis] Related Party Transaction [Axis] Segment Reporting [Line Items] Segment Reporting [Line Items] Unrecognized compensation costs Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Conversion of redeemable convertible preferred stock into Series A Common Stock Temporary Equity, Value, Conversion of Convertible Securities Temporary Equity, Value, Conversion of Convertible Securities Document Quarterly Report Document Quarterly Report Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity 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or Right, Redemption, Exercise Price of Warrants or Rights, Threshold Class of Warrant or Right, Redemption, Exercise Price of Warrants or Rights, Threshold Interest rate (in percent) Debt Instrument, Interest Rate, Stated Percentage Counterparty Name [Domain] Counterparty Name [Domain] Total stockholders’ equity (deficit) Beginning balance Ending balance Equity, Attributable to Parent Total other income (expenses), net Total other income (expenses), net Nonoperating Income (Expense) Voting rights, number of votes Common Stock, Voting Rights, Number Of Votes Common Stock, Voting Rights, Number Of Votes ASSETS: Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Cartesian Growth Corporation (“CGC”) Cartesian Growth Corporation (“CGC”) [Member] Cartesian Growth Corporation (“CGC”) Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Advances on property and equipment Payments For Advances On Property, Plant, and Equipment Payments For Advances On Property, Plant, and Equipment Professional service expense Professional Fees Insider Trading Policies and Procedures [Line Items] ACCRUED EXPENSES Accounts Payable and Accrued Liabilities Disclosure [Text Block] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Prepaid expenses and other current assets (includes $720 and $1,110 as related party as of June 30, 2026, and December 31, 2025, respectively) Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Selling, general and administrative (includes $65 and $44 for the three months ended June 30, 2026 and 2025, respectively; and $153 and $88 for the six months ended June 30, 2026 and 2025, respectively, of related party expenses) Selling, general and administrative Selling, General and Administrative Expense Private Placement Private Placement [Member] Cartesian Growth Corporation (“CGC”) Series A Shares (“NRA Shares”) Cartesian Growth Corporation (“CGC”) Series A Shares (“NRA Shares”) [Member] Cartesian Growth Corporation (“CGC”) Series A Shares (“NRA Shares”) COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Number of operating segments Number of Operating Segments Anti-dilutive securities Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Restricted stock units Restricted Stock Units (RSUs) [Member] Schedule of Antidilutive Securities Excluded from Computation of Earnings 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] 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 Series D redeemable convertible preferred stock Series D Redeemable Convertible Preferred Stock [Member] Series D Redeemable Convertible Preferred Stock Income Statement [Abstract] Stockholders’ equity (deficit): Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Maximum consideration Collaborative Arrangement, Rights and Obligations, Maximum Consideration Collaborative Arrangement, Rights and Obligations, Maximum Consideration Operating expenses: Operating Expenses [Abstract] Reverse Recapitalization [Abstract] Reverse Recapitalization Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Non-cash lease expenses and amortization Noncash Lease Expense And Amortization Noncash Lease Expense And Amortization City Area Code City Area Code Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Document Information [Table] Document Information [Table] All Individuals All Individuals [Member] SUBSEQUENT EVENTS Subsequent Events [Text Block] Assumed volatility Measurement Input, Price Volatility [Member] Valuation Technique, SPAC Exit Scenario Valuation Technique, SPAC Exit Scenario [Member] Valuation Technique, SPAC Exit Scenario Deferred transaction costs included in accrued expenses Stock Issuance Costs Included In Accrued Liabilities Stock Issuance Costs Included In Accrued Liabilities Series D Series D Redeemable Convertible Preferred Stock Warrant [Member] Series D Redeemable Convertible Preferred Stock Warrant Name Forgone Recovery, Individual Name Unrecognized compensation costs, weighted-average period Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Previously Reported Previously Reported [Member] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Statement [Line Items] Statement [Line Items] Total Assets Assets Entity [Domain] Entity [Domain] Preferred stock, issued (in shares) Preferred Stock, Shares Issued Convertible Promissory Notes Convertible Debt [Member] Leases Lease Obligation Incurred Series B-1 Series B-1 Redeemable Convertible Preferred Stock Warrant [Member] Series B-1 Redeemable Convertible Preferred Stock Warrant Accrued private issuance liability (included in accrued expenses) Accrued Private Issuance Liability, Fair Value Disclosure Accrued Private Issuance Liability, Fair Value Disclosure Grants in period, weighted average grant-date fair value (in usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value STOCK BASED COMPENSATION Share-Based Payment Arrangement [Text Block] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Issuance of convertible promissory notes, net Proceeds from Convertible Debt Occupancy expense Occupancy, Net PEO PEO [Member] Total Share-Based Payment Arrangement, Expense Debt Instrument, Convertible Terms Of Conversion [Domain] Debt Instrument, Convertible Terms Of Conversion [Domain] Debt Instrument, Convertible Terms Of Conversion [Domain] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Issuance of Series A common stock from stock option exercises (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Payables and Accruals [Abstract] Accumulated Deficit Retained Earnings [Member] Operating lease liabilities, net of current portion Operating Lease, Liability, Noncurrent Total operating expenses Operating Expenses Revision of Prior Period [Domain] Revision of Prior Period [Domain] Computer and software Software, In-Development, Internally Developed, and Purchased [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Warrant Instruments Warrants, Policy [Policy Text Block] Warrants, Policy Fair Value Measurement Inputs and Valuation Techniques Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Sale of stock, issuable in transaction (in shares) Sale of Stock, Number of Shares Issuable in Transaction Sale of Stock, Number of Shares Issuable in Transaction Net loss per share attributable to common stockholders – diluted (in usd per share) Diluted loss per share (in usd per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Collaborative Arrangement, Transaction with Party to Collaborative Arrangement Collaborative Arrangement, Transaction with Party to Collaborative Arrangement [Member] Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Letter Agreement Letter Agreement [Member] Letter Agreement Total Shareholder Return Amount Total Shareholder Return Amount Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Liabilities: Liabilities, Fair Value Disclosure [Abstract] Redemption, threshold consecutive trading days Class Of Warrant Or Right, Redemption, Threshold Consecutive Trading Days Class Of Warrant Or Right, Redemption, Threshold Consecutive Trading Days Sponsor Members Sponsor Members [Member] Sponsor Members Advisory agreement term Advisory Agreement, Term Advisory Agreement, Term Research and development, net (includes $10 and $140 for the three months ended June 30, 2026 and 2025, respectively; and $10 and $165 for the six months ended June 30, 2026 and 2025, respectively, of related party research and development reimbursement) Research and development, net Research and development expense Research and Development Expense Share value Measurement Input, Share Price [Member] Redeemable convertible preferred stock, par value (in usd per share) Temporary Equity, Par or Stated Value Per Share Conversion ratio Recapitalization Exchange Ratio Recapitalization Exchange Ratio Share-Based Payment Arrangement [Abstract] Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Property and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Redemption price (in usd per share) Converted instrument, issue (in usd per share) Shares Issued, Price Per Share Debt Conversion Terms Two Debt Conversion Terms Two [Member] Debt Conversion Terms Two SPAC Exit Scenario Measurement Input, SPAC Exit Scenario [Member] Measurement Input, SPAC Exit Scenario Numerator: Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Issuance of Series A Common Stock from stock option exercises Stock Issued During Period, Value, Stock Options Exercised Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Sponsor and Director Co Sponsor And Director Members [Member] Sponsor And Director Members Issued during period, acquisition (in shares) Stock Issued During Period, Shares, Acquisitions Converted instrument, issued (in shares) Debt Conversion, Converted Instrument, Shares Issued Series A-1 redeemable convertible preferred stock Series A-1 Redeemable Convertible Preferred Stock [Member] Series A-1 Redeemable Convertible Preferred Stock Segment Reporting [Table] Segment Reporting [Table] Related Party Transaction [Table] Related Party Transaction [Table] Subscription Agreements Subscription Agreements [Member] Subscription Agreements Sale of Stock [Axis] Sale of Stock [Axis] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Fair value outstanding Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Noteholder Noteholder [Member] Noteholder 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 Date Current Fiscal Year End Date Warrants outstanding Warrants and Rights Outstanding Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Related Party Transaction [Domain] Related Party Transaction [Domain] Repurchased during period (in shares) Stock Repurchased During Period, Shares Lease agreement, total expected cash payments Unrecorded Unconditional Purchase Obligation 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 of Prior Year Equity Awards Vested in Covered Year [Member] Earnings Per Share, Diluted, by Common Class, Including Two-Class Method [Table] Earnings Per Share, Diluted, by Common Class, Including Two-Class Method [Table] Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Conversion basis Temporary Equity, Conversion Basis Temporary Equity, Conversion Basis Deferred transaction costs Deferred Costs, Current 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] Legacy Factorial Convertible Notes Shareholders Legacy Factorial Convertible Notes Shareholders [Member] Legacy Factorial Convertible Notes Shareholders Common stock, issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Reverse Recapitalization Reverse Recapitalization Disclosure [Text Block] Reverse Recapitalization Disclosure Equity Components [Axis] Equity Components [Axis] Stellantis Stellantis [Member] Stellantis Related Party Related Party [Member] Class of Stock [Line Items] Class of Stock [Line Items] Converted, reverse recapitalization (in shares) Stock Converted, Reverse Recapitalization Stock Converted, Reverse Recapitalization WARRANTS Warrants [Text Block] Warrants Series A Common Stock, par value $0.00001 per share Series A Common stock Common Class A [Member] Entity Interactive Data Current Entity Interactive Data Current Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Small Business Entity Small Business Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Property, Plant, and Equipment [Line Items] Property, Plant, and Equipment [Line Items] Gatemore Capital Management Gatemore Capital Management [Member] Gatemore Capital Management Authorized (in shares) Common Stock And Preferred Stock, Shares Authorized Common Stock And Preferred Stock, Shares Authorized Subsequent Events [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Conversion of convertible promissory notes and accrued interest into Series A Common Stock Debt Conversion, Original Debt, Amount 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] PIPE Sponsor Investor PIPE Sponsor Investor [Member] PIPE Sponsor Investor Collaboration Arrangements and Partnership Agreements Collaborative Arrangement, Accounting Policy [Policy Text Block] Other non-current assets (related party) 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 Total accrued expenses Accrued Liabilities, Current Fair Value as of Grant Date Award Grant Date Fair Value Non-cash interest Paid-in-Kind Interest SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Subsequent Event [Line Items] Subsequent Event [Line Items] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Conversion to shares of Series A Common Stock Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Conversion Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Conversion Redeemable convertible preferred stock, authorized (in shares) Temporary Equity, Shares Authorized Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Reverse Recapitalization Reverse Recapitalization [Member] Reverse Recapitalization 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] Commitments and contingencies (Note 9) Commitments and Contingencies Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Total Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Machinery and equipment Machinery and Equipment [Member] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Furniture and fixtures Furniture and Fixtures [Member] Counterparty Name [Axis] Counterparty Name [Axis] Liabilities, Redeemable Convertible Preferred Stock & Stockholders’ Equity (Deficit) Liabilities and Equity [Abstract] Total redeemable convertible preferred stock Beginning balance Ending balance Temporary Equity, Carrying Amount, Attributable to Parent Series C-2 redeemable convertible preferred stock Series C-2 Redeemable Convertible Preferred Stock [Member] Series C-2 Redeemable Convertible Preferred Stock Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Warrants outstanding (in shares) Class of Warrant or Right, Outstanding FAIR VALUE MEASURES Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Future projected price per share Measurement Input, Future Projected Price Per Share [Member] Measurement Input, Future Projected Price Per Share Supplemental disclosures: Supplemental Cash Flow Information [Abstract] PEO Name PEO Name Threshold percentage of stock price trigger Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Accrued expenses Increase (Decrease) in Accrued Liabilities Leasehold improvements Leasehold Improvements [Member] Redeemable convertible preferred stock, issued (in shares) Factorial Shares Issued Temporary Equity, Shares Issued Dividend yield Measurement Input, Dividend Yield [Member] Measurement Input, Dividend Yield Issuance of common stock in connection with reverse recapitalization and PIPE Financing, net of issuance costs Total Stock Issued During Period, Value, Reverse Recapitalization Stock Issued During Period, Value, Reverse Recapitalization Long-Lived Asset, Class [Axis] Long-Lived Asset, Class [Axis] 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] Accrued interest Interest Expense, Debt Liability Class [Axis] Liability Class [Axis] Series B-1 and Series D redeemable convertible preferred stock warrants Series B-1 And D Redeemable Convertible Preferred Stock Warrants [Member] Series B-1 And D Redeemable Convertible Preferred Stock Warrants Warrants, each whole warrant exercisable for one share of Series A Common Stock at an exercise price of $11.50 Warrants for Series A Series A Common Stock Private Warrants [Member] Series A Common Stock Private Warrants Beginning cash, cash equivalents and restricted cash Ending cash, cash equivalents and restricted cash Total cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Accrued legal and professional Accrued Professional Fees, Current Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] Accounts payable Increase (Decrease) in Accounts Payable Accrued other 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] THE COMPANY 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 Share-Based Payment Arrangement, Noncash Expense Payroll expense Labor and Related Expense Conversion of redeemable convertible preferred stock into Series A Common Stock (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Net loss per share attributable to common stockholders – basic (in usd per share) Basic loss per share (in usd per share) Earnings Per Share, Basic Measurement Input Type [Axis] Measurement Input Type [Axis] Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] Assumed risk-free interest rate Measurement Input, Risk Free Interest Rate [Member] Total current assets Assets, Current Insider Trading Arrangements [Line Items] Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accumulated deficit Retained Earnings (Accumulated Deficit) 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 [Member] REDEEMABLE CONVERTIBLE PREFERRED STOCK Temporary Equity Disclosure [Text Block] Temporary Equity Disclosure Proceeds received from reverse recapitalization, gross Proceeds From Reverse Recapitalization Transaction, Gross Proceeds From Reverse Recapitalization Transaction, Gross Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Equity Awards Adjustments Equity Awards Adjustments [Member] Warrants [Abstract] Warrants Total Liabilities, Redeemable Convertible Preferred Stock & Stockholders’ Equity (Deficit) Liabilities and Equity Warrant liabilities Derivative Liability, Noncurrent Clear Street LLC (“Clear Street”) Clear Street LLC (“Clear Street”) [Member] Clear Street LLC (“Clear Street”) Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Options to purchase Series A Common Stock Share-Based Payment Arrangement, Option [Member] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Related and Nonrelated Parties [Domain] Related and Nonrelated Parties [Domain] Warrant liability, measurement input Derivative Liability, Measurement Input Series C-1 redeemable convertible preferred stock Series C-1 Redeemable Convertible Preferred Stock [Member] Series C-1 Redeemable Convertible Preferred Stock Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Other income, net Other Nonoperating Income (Expense) Debt Instrument, Convertible Terms Of Conversion [Axis] Debt Instrument, Convertible Terms Of Conversion [Axis] Debt Instrument, Convertible Terms Of Conversion Other operating expense Other Operating Income (Expense), Net Name Awards Close in Time to MNPI Disclosures, Individual Name PIPE Institutional Investor PIPE Institutional Investor [Member] PIPE Institutional Investor 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] Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Issued and sold (in usd per share) Sale of Stock, Price Per Share Conversion of redeemable convertible preferred stock into Series A Common Stock Stock Issued During Period, Value, Conversion of Convertible Securities Preferred stock, authorized (in shares) Preferred Stock, Shares Authorized Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Convertible promissory notes, measurement input Debt Instrument, Measurement Input Preferred stock, $0.00001 pare value, 100,000,000 authorized as of June 30, 2026. No shares were authorized as of December 31, 2025. Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Class of Stock [Domain] Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Reportable Segment Reportable Segment [Member] Reportable Segment Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total Assets Assets, Fair Value Disclosure Reimbursement from JDAs and others Reimbursement Income Reimbursement Income Name Measure Name Accounts payable (includes $2 and $190 as related party, as of June 30, 2026, and December 31, 2025, respectively) Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Debt Conversion Terms One Debt Conversion Terms One [Member] Debt Conversion Terms One Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional Paid-In Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Subsidiary or Equity Method Investee, Sale of Stock [Table] Subsidiary or Equity Method Investee, Sale of Stock [Table] Redemption period Class of Warrant or Right, Redemption Period Class of Warrant or Right, Redemption Period Revision of Prior Period [Axis] Revision of Prior Period [Axis] Name Trading Arrangement, Individual Name Schedule Of Reverse Recapitalization [Table] Schedule Of Reverse Recapitalization [Table] Schedule Of Reverse Recapitalization [Table] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Expected life Measurement Input, Expected Term [Member] Schedule Of Reverse Recapitalization Schedule Of Reverse Recapitalization [Table Text Block] Schedule Of Reverse Recapitalization Conversion of redeemable convertible preferred stock and treasury stock into Series A common stock (in shares) Temporary Equity, Shares, Conversion of Convertible Securities Temporary Equity, Shares, Conversion of Convertible Securities Company Selected Measure Amount Company Selected Measure Amount Depreciation and amortization Depreciation, Depletion and Amortization Stock, Class of Stock [Table] Stock, Class of Stock [Table] Current assets: Assets, Current [Abstract] Warrant liability Derivative Liability Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Joseph Taylor Joseph Taylor [Member] Joseph Taylor Income tax expense Income Tax Expense (Benefit) Adjustments to reconcile net loss to net cash used in operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract] Temporary Equity, by Class of Stock [Table] Temporary Equity, by Class of Stock [Table] Award Timing Method Award Timing Method [Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Net change 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] Transaction costs Payments of transaction expenses Payments of Reverse Recapitalization Transaction Costs Payments of Reverse Recapitalization Transaction Costs Net loss Net loss Net Income (Loss) Attributable to Parent Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Factorial Warrants Shareholders Factorial Warrants Shareholders [Member] Factorial Warrants Shareholders Schedule Of Reverse Recapitalization [Line Items] Schedule Of Reverse Recapitalization [Line Items] Schedule Of Reverse Recapitalization [Line Items] Restatement Determination Date: Restatement Determination Date [Axis] Number of securities called by each warrant or right (in shares) Class of Warrant or Right, Number of Securities Called by Each Warrant or Right Proceeds from stock option exercises Proceeds from Stock Options Exercised Advances on purchases of property and equipment Property, Plant and Equipment, Other Types [Member] Converted instrument, value Debt Conversion, Converted Instrument, Amount Consideration for performance Collaborative Arrangement, Rights and Obligations, Maximum Aggregate Performance Payments Collaborative Arrangement, Rights and Obligations, Maximum Aggregate Performance Payments Unrealized foreign exchange loss (gain) Unrealized Gain (Loss), Foreign Currency Transaction, before Tax Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Damages sought Loss Contingency, Damages Sought, Value Change in fair value of convertible promissory notes Change in fair value of convertible promissory notes Fair Value, Option, Changes in Fair Value, Gain (Loss) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Numerator: Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]