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Contractual Obligation, Fiscal Year Maturity [Table Text Block] us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable Income tax liabilities Financial Instruments [Domain] Interest income Dividend declared per share (in dollars per share) Dividends and dividend equivalents declared per share (in dollars per share) us-gaap_IncreaseDecreaseInInventories Inventories Segment Reporting [Text Block] us-gaap_IncreaseDecreaseInOtherAccruedLiabilities Other accrued liabilities Award Type [Axis] Adjustments to reconcile net income to net cash provided by operating activities: Plan Name [Axis] us-gaap_Liabilities Total liabilities Defined Benefit Plan [Table] Plan Name [Domain] Share based compensation expense Share-Based Payment Arrangement, Expense us-gaap_IncreaseDecreaseInReceivables Accounts receivable us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and stockholders’ equity Cash and Cash Equivalent [Table] Title and Position [Axis] Segment Reporting [Table] Location, Statement of Financial Position, Balance [Axis] Condensed Balance Sheet Statement [Table] us-gaap_ShareBasedCompensation Stock-based compensation expense Selling, general and administrative Tax benefit related to stock-based compensation us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) Share-Based Payment Arrangement [Text Block] Changes in operating assets and liabilities: us-gaap_IncreaseDecreaseInAccountsPayable Accounts payable Europe [Member] Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets: mpwr_PropertyAndEquipmentPurchasedOnExtendedPaymentTerms Property and equipment purchased on extended payment terms Property and equipment purchased on extended payment terms during the period. mpwr_ContributionsMadeToDeferredCompensationPlan Contributions to deferred compensation plan Represents the contributions made to deferred compensation plan. us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net decrease in cash, cash equivalents and restricted cash us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents Total cash, cash equivalents, and restricted cash Cash, cash equivalents and restricted cash, beginning of period Cash, cash equivalents and restricted cash, end of period Effect of change in exchange rates Liability accrued for dividends and dividend equivalents The amount of dividend and dividend equivalents accrued during the period and not yet paid. New Accounting Pronouncements, Policy [Policy Text Block] Statement [Table] The2014 Plan [Member] The reporting entity's 2014 Equity Incentive Plan. Prepaids and other us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber Balance (in shares) Balance (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue Outstanding, weighted average (in dollars per share) Outstanding, weighted average (in dollars per share) Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) srt_StockRepurchaseProgramAuthorizedAmount1 Share Repurchase Program, Authorized, Amount Granted, weighted average (in dollars per share) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod Forfeited (in shares) Product and Service [Domain] Product and Service [Axis] Vested, weighted average (in dollars per share) us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod Vested (in shares) Asset Class [Axis] Deming Xiao [Member] Represents Deming Xiao. us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) Commitments and Contingencies Disclosure [Text Block] Nature of Expense [Axis] Statement [Line Items] Fair Value Hierarchy and NAV [Axis] Common stock, shares issued (in shares) Common stock, shares outstanding (in shares) Balance (in shares) Balance (in shares) Award Type [Domain] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Common stock, shares authorized (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Schedule of Accrued Liabilities [Table Text Block] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Inventory, Current [Table Text Block] Accounts payable Refundable deposit The carrying amount of the asset transferred to a third party to serve as a refundable deposit, which typically serves as security against failure by the transferor to perform under terms of an agreement. us-gaap_PolicyTextBlockAbstract Accounting Policies The 2026 Executive PSUs [Member] Represents the 2026 Executive PSUs. us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements us-gaap_TableTextBlock Notes Tables Research and Development [Member] Represents research and development. Deming Xiao 2 [Member] Represents Deming Xiao. us-gaap_ComprehensiveIncomeNetOfTax Comprehensive income Short-term investments Short-term investments Concentration Risk Type [Axis] Employees [Member] Represents information about employees. Other accrued liabilities Total Selling, General, and Administrative [Member] Represents selling, general, and administrative. us-gaap_DividendsPayableCurrent Dividends Payable, Current Accrued compensation and related benefits Significant Accounting Policies [Text Block] mpwr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsMaximumPercentageAllowedBasedOnAverageRevenueGrowthRate Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed Based on Average Revenue Growth Rate The maximum number of equity awards that may be earned expressed as a percentage of the target number of awards. mpwr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsMaximumPercentageAllowedBasedOnManufacturingCapacity Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed Based on Manufacturing Capacity The maximum number of equity awards that can be earned expressed as a percentage of the target number of awards. us-gaap_OperatingLeaseLiabilityNoncurrent Operating lease liabilities us-gaap_OtherAccruedLiabilitiesCurrent Other Accounts Receivable [Member] us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1 Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year) Concentration Risk Type [Domain] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Cash Surrender Value [Member] us-gaap_StandardProductWarrantyAccrual Standard Product Warranty Accrual Sales of property and equipment CHINA Stock rotation and sales returns Represents stock rotation reserve. Dividends and dividend equivalents Represents dividends and dividend equivalents. us-gaap_LongTermInvestments Investment within other long-term assets Maturities and sales of investments mpwr_DividendEquivalentsNoncurrent Dividend equivalents Long-term accrued dividend equivalents. Statement of Stockholders' Equity [Abstract] Statement of Comprehensive Income [Abstract] Statement of Cash Flows [Abstract] Cost Of Revenue [Member] Represents cost of revenue. Stockholders’ equity: Equity Components [Axis] Equity Component [Domain] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] Equity [Text Block] Fair Value, Inputs, Level 1 [Member] AOCI Attributable to Parent [Member] Retained Earnings [Member] Distributor A [Member] Represents distributor A. Property and equipment, net Compensation and Employee Benefit Plans [Text Block] Financial Instruments Disclosure [Text Block] Liability accrued for property and equipment purchases Distributor B [Member] Represents the information pertaining to distributor B. JAPAN Deferred tax assets, net Deferred compensation plan liabilities KOREA, REPUBLIC OF South East Asia [Member] Represents South East Asia. Deferred compensation plan liabilities, other long-term liabilities Deferred compensation plan liabilities Cost of revenue Other Region [Member] Represents other region. Stock-based compensation expense Time-based RSUs, PSUs and MSUs [Member] Represents the Time-based RSUs, PSUs and MSUs. Schedule of Deferred Compensation Arrangement with Individual, Excluding Share-Based Payments and Postretirement Benefits by Title of Individual and Type of Deferred Compensation [Table Text Block] Deferred tax liabilities Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Charitable commitments Represents gain (loss) on commitment. Fair Value Disclosures [Text Block] Fair Value, by Balance Sheet Grouping [Table Text Block] mpwr_CashCashEquivalentsAndInvestments Total Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. Long-term investments include auction-rate securities. Supplemental disclosures for cash flow information: Current liabilities: us-gaap_LiabilitiesCurrent Total current liabilities Amortization of discount on available-for-sale securities Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue [Table Text Block] Accounts receivable, net us-gaap_ProductWarrantyObligationTerm Product Warranty Obligation, Term (Year) Customer Concentration Risk [Member] Revenue Benchmark [Member] Other Commitments [Table] mpwr_AccruedDividendEquivalents Accrued Dividend Equivalents Amount of dividend equivalents accrued during the period. Accumulated other comprehensive loss Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Long-Lived Asset [Table Text Block] us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest Income before income taxes TAIWAN Use of Estimates, Policy [Policy Text Block] us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) Common stock and additional paid-in capital: $0.001 par value; shares authorized: 150,000; shares issued and outstanding: 49,129 and 48,709, respectively us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1 Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Purchases of property and equipment Common stock issued UNITED STATES us-gaap_PaymentsToAcquireShortTermInvestments Purchases of investments us-gaap_MoneyMarketFundsAtCarryingValue Money market funds Current assets: Money Market Funds [Member] us-gaap_AssetsCurrent Total current assets us-gaap_GrossProfit Gross profit Common stock issued (in shares) Restricted Stock Units (RSUs) [Member] us-gaap_StockRepurchasedAndRetiredDuringPeriodShares Stock Repurchased and Retired During Period, Shares (in shares) Common Stock Including Additional Paid in Capital [Member] Cash flows from operating activities: us-gaap_PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear 2026 (remaining nine months) Cash flows from investing activities: us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by operating activities Raw materials Cash flows from financing activities: Work in process us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash used in investing activities us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash used in financing activities Finished goods Amended and Restated 2014 Plan [Member] Represents information related to amended and restated 2014 plan. Assets, fair value Distributor C [Member] Represents the information pertaining to distributor C. Accounting Policies [Abstract] Deferred compensation plan assets Deferred compensation plan assets Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Deferred compensation plan liabilities, accrued compensation and related benefits Long lived assets by region Income Statement [Abstract] us-gaap_PurchaseObligationDueInNextTwelveMonths 2027 us-gaap_NumberOfReportableSegments Number of Reportable Segments us-gaap_OtherAssetsMiscellaneousNoncurrent Other Deferred taxes, net us-gaap_PurchaseObligation Total us-gaap_PurchaseObligationDueInSecondYear 2028 us-gaap_PurchaseObligationDueInThirdYear 2029 Loss on deferred compensation plan investments Gains or losses on deferred compensation plan investments. Net income Net income Net income us-gaap_OtherNoncashIncomeExpense Other Income Tax Disclosure [Text Block] Proceeds from common stock issued Other Nonoperating Income and Expense [Text Block] Accounting Standards Update and Change in Accounting Principle [Table] Other receivables Supplemental Balance Sheet Disclosures [Text Block] Dividends Declared [Table Text Block] Fair Value Hierarchy and NAV [Domain] Product Sales Through Distribution Arrangements [Member] Related to product sales through distribution arrangements. Statement of Financial Position [Abstract] Other income, net Total Cash paid (refunded) for income taxes, net Total amount mpwr_PolicyTable Mutual Fund [Member] Other long-term assets Total Nonmonetary Transaction, by Type [Table] us-gaap_IncreaseDecreaseInOtherOperatingAssets Other assets Document Type Operating expenses: Document Information [Line Items] Document Quarterly Report Concentration risk Concentration Risk, Percentage Document Information [Table] us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment Effect of dilutive securities (in shares) Entity Interactive Data Current Document Transition Report Diluted (in shares) us-gaap_OperatingExpenses Total operating expenses Net income per share: us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis Total, Amortized cost us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate Total, fair value Basic (in shares) Basic (in dollars per share) Basic (in dollars per share) Research and development Earnings Per Share, Diluted, by Common Class, Including Two-Class Method [Table] Other Noncurrent Liabilities [Table Text Block] Effective Income Tax Rate Reconciliation [Table] Title and Position [Domain] Acquisition-related intangible assets, net us-gaap_RestrictedCashAndCashEquivalentsNoncurrent Restricted cash included in other long-term assets Document Fiscal Period Focus Customer [Domain] Document Fiscal Year Focus Amendment Flag Goodwill Document Period End Date us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested Legal Entity [Axis] mpwr_ContractWithCustomerPaymentTerm Contract with Customer, Payment Term (Day) The term in which a customer of the reporting entity is required to pay following the satisfaction of performance obligations. Entity File Number Entity Tax Identification Number Non-cash investing and financing activities: Disaggregation of Revenue [Table] Entity [Domain] Entity Central Index Key Entity Registrant Name Schedule of Other Nonoperating Income (Expense) [Table Text Block] Foreign currency translation adjustments Entity Current Reporting Status Entity Incorporation, State or Country Code Current Fiscal Year End Date Net change in unrealized gains and losses on available-for-sale securities Entity Filer Category Entity Shell Company Entity Emerging Growth Company mpwr_ShareBasedCompensationArrangementByShareBasedPaymentAwardPricePerSharePayableUponVestingOfEquityInstrumentsOtherThanOptions Share-based Compensation Arrangement by Share-based Payment Award, Price Per Share Payable Upon Vesting of Equity Instruments Other than Options (in dollars per share) The amount per share required to be paid by employees upon the vesting of equity instruments other than options. Other comprehensive income us-gaap_OtherComprehensiveIncomeLossNetOfTax Other comprehensive income, net of tax Entity Small Business us-gaap_OperatingIncomeLoss Operating income us-gaap_Cash Cash Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Entity Address, State or Province Entity Address, City or Town Retained earnings Entity Address, Address Line One City Area Code Due in 1 - 5 years, Amortized cost Due in greater than 5 years, Amortized cost Local Phone Number Due in less than 1 year, Amortized cost Entity Address, Postal Zip Code Revenue from Contract with Customer [Text Block] Mutual Funds and Money Market Funds, Fair Value [Member] The fair value of regulated investment instrument that pools funds from multiple investors to invest principally in a portfolio of securities and money market instruments to match the investment objective. Auction Rate Securities [Member] Title of 12(b) Security Security Exchange Name Due in greater than 5 years, fair value Trading Symbol Due in less than 1 year, fair value Due in 1 - 5 years, fair value Class of Stock [Axis] us-gaap_AvailableForSaleSecuritiesDebtSecurities Available for sale securities, fair value Entity Common Stock, Shares Outstanding Other comprehensive income, net of tax Earnings Per Share [Text Block] Executive Officer [Member] Other current assets Total Director [Member] Income tax liabilities Weighted-average shares outstanding: us-gaap_AccruedIncomeTaxesCurrent Income tax payable Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Investments Classified by Contractual Maturity Date [Table Text Block] Common stock, par value (in dollars per share) Schedule of Other Assets, Noncurrent [Table Text Block] us-gaap_OtherNonoperatingIncomeExpense Other mpwr_GainLossOnDeferredCompensationPlanInvestmentsCashFlow Loss on deferred compensation plan investments Gains or losses on deferred compensation plan investments related to cash flows. us-gaap_Assets Total assets Cash and cash equivalents Cash and cash equivalents Geographical [Domain] Geographical [Axis] Diluted (in dollars per share) Diluted (in dollars per share) Schedule of Other Current Assets [Table Text Block] Customer [Axis] Depreciation and amortization Investment Holdings [Table] Asset Class [Domain] Individual [Axis] Interim Period, Costs Not Allocable [Domain] Inventories Total All Individuals [Member] us-gaap_StockholdersEquity Total stockholders’ equity Balance Balance Forfeited, weighted average (in dollars per share) us-gaap_PaymentsOfDividends Dividends and dividend equivalents paid Stock, Class of Stock [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Other long-term liabilities Total ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] Revenue ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Commitments and contingencies (Note 7)