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respectively) Total equity investments Long-Term Investments Tax liabilities Increase (Decrease) in Income Taxes Payable Gross increases—tax positions in current period Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Other liabilities (including payables to related parties) Increase (Decrease) in Other Operating Liabilities Cash and cash equivalents at the beginning of the period Cash and cash equivalents at the end of the period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Asset Class [Axis] Asset Class [Axis] Restricted Stock Units, Time-Based Restricted Stock Units, Time-Based [Member] Restricted Stock Units, Time-Based Remaining Performance Obligation, Type [Domain] Remaining Performance Obligation, Type [Domain] Remaining Performance Obligation, Type [Domain] Loans Payable Loans Payable [Member] Impairment of 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[Member] China Walden Ventures Investments III, L.P. 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Receivable [Table] Fair value of awards Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Income (loss) from equity investments, net Income (loss) from equity investments, net Total loss from equity investments, net Gain (Loss) on Investments Additional paid-in capital Additional Paid in Capital Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract] Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract] Convertible loans receivable Convertible promissory note Loans Receivable, Fair Value Disclosure Document Information [Line Items] Document Information [Line Items] Non-current portion of accrued compensation and share-based compensation Non-current portion of accrued compensation and share-based compensation increase (decrease) Accounts Payable and Accrued Liabilities, Noncurrent Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Income Taxes Income Tax, Policy [Policy Text Block] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Three Loans and other receivables carried at amortized cost Loan receivable Financing Receivable, before Allowance for Credit Loss Customer deposits Contract with Customer, Refund Liability Related Party, Type [Axis] Related Party, Type [Axis] Tax Credit Carryforward With No Expiration Tax Credit Carryforward With No Expiration [Member] Tax Credit Carryforward With No Expiration Reclassification of RSU awards previously liability-classified Adjustment To Additional Paid In Capital, Share-Based Compensation Liability Reclassified To Equity Adjustment To Additional Paid In Capital, Share-Based Compensation Liability Reclassified To Equity Issuance of vested shares from share-based payment arrangements (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Entity Registrant Name Entity Registrant Name Non-cash additions of operating lease liabilities Non-Cash Additional Of Operating Lease Liabilities Non-Cash Additional Of Operating Lease Liabilities 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Two Cost of sales Cost of Sales [Member] Auditor Name Auditor Name Less: Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 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] Entity Central Index Key Entity Central Index Key Equity Method Investments, Fair Value Option Equity Method Investments, Fair Value Option [Member] Equity Method Investments, Fair Value Option Fair value losses recognized in the Consolidated Income Statements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Share-based compensation cost (credit) Share-Based Payment Arrangement, Expense Gross Carrying Amount Finite-Lived Intangible Assets, Gross Income Tax Authority [Domain] Income Tax Authority [Domain] Accrued compensation and benefits and share-based compensation Accrued compensation and benefits and share-based compensation Accrued compensation and benefits and share-based compensation increase (decrease) Accrued Liability Employee-related Liabilities, Current Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Selling, general and administrative Disposal Group, Including Discontinued Operation, Selling, General And Administrative Expense Disposal Group, Including Discontinued Operation, Selling, General And Administrative Expense Foreign tax rate differential Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Revenue Revenue from Contract with Customer, Excluding Assessed Tax Entity [Domain] Entity [Domain] Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Amendment Flag Amendment Flag Intangible Assets, Net Intangible Assets Disclosure [Text Block] Shares issued (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Issued In Connection With The IPO Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Issued In Connection With The IPO Legal Entity [Axis] Legal Entity [Axis] Present value per RSU Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Present Value Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Present Value Second Largest Customer Second Largest Customer [Member] Second Largest Customer Number of grantees affected by modification Share-Based Payment Arrangement, Plan Modification, Number of Grantees Affected Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Cash payments for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Assets, Fair Value Disclosure [Abstract] Assets, Fair Value Disclosure [Abstract] Gains exempt from U.K. tax Effective Income Tax Rate Reconciliation, Exempt Gains, Amount Effective Income Tax Rate Reconciliation, Exempt Gains, Amount Business Combinations Business Combinations Policy [Policy Text Block] Goodwill Goodwill Disclosure [Text Block] Leasehold improvements Leasehold Improvements [Member] Selling, General and Administrative Selling, General and Administrative Expenses, Policy [Policy Text Block] Net deferred tax liabilities Deferred Tax Liabilities, Net Diluted (in shares) Weighted average ordinary shares used to calculate diluted net income (loss) per share (in shares) Weighted Average Number of Shares Outstanding, Diluted Schedule of Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Interest income, net Interest Income (Expense), Nonoperating, Net Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Weighted average share price (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Per Share Weighted Average Price of Shares Purchased Total assets Assets China Walden Ventures Investments II, L.P. —NAV China Walden Ventures Investments, II, L.P. [Member] China Walden Ventures Investments, II, L.P. Equipment Equipment [Member] Share-based compensation cost APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Restructuring and Related Activities [Abstract] 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 Annual increase in shares authorized Share-Based Compensation Arrangement By Share-Based Payment Award, Annual Increase In Shares Authorized Share-Based Compensation Arrangement By Share-Based Payment Award, Annual Increase In Shares Authorized Construction in progress Construction in Progress [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Audit Information [Abstract] Audit Information [Abstract] Audit Information Research and development expenditure credit (RDEC) Research And Development Expenditure Credit Research And Development Expenditure Credit Cash flows provided by (used for) financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Weighted average ordinary shares outstanding Earnings Per Share, Basic, Other Disclosure [Abstract] Contract assets Contract with Customer, Asset, after Allowance for Credit Loss Debt Instrument [Line Items] Debt Instrument [Line Items] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Fixed assets Deferred Tax Assets, Property, Plant and Equipment Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Market value Fair value of outstanding awards Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested Cost of sales Cost of Revenue Arm IOT Fund LP (Taiwan) ARM IOT Fund LP (Taiwan) [Member] ARM IOT Fund LP (Taiwan) Related Party Transaction [Axis] Related Party Transaction [Axis] Statement [Line Items] Statement [Line Items] Acquired intangibles Deferred Tax Liabilities, Intangible Assets Schedule of Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Financial commitments to investees, off balance sheet Financial Commitments To Investees, Off Balance Sheet Financial Commitments To Investees, Off Balance Sheet Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis] Net loss from discontinued operations Net loss from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent