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The period required for customers to pay in advance of products being shipped by the reporting entity.

No definition available.

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Data Type:	xbrli:durationItemType
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Represents the percentage of revenue generated during the period.

No definition available.

Name:	mpwr_PercentageOfRevenue
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Data Type:	dtr-types:percentItemType
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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-URI https://asc.fasb.org/1943274/2147479837/606-10-45-2

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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Name:	srt_RangeAxis=srt_MaximumMember
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Name:	srt_MajorCustomersAxis=mpwr_CertainCustomersInChinaMember
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Name:	us-gaap_BalanceSheetLocationAxis=mpwr_AccruedLiabilitiesCurrentMember
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Name:	srt_ProductOrServiceAxis=us-gaap_ProductMember
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Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix:
Data Type:	na
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