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Sale of I/O Technology (Details) (Sale of license of a portion of intellectual property pertaining to high-speed serial I/O technology, USD $) In Millions, unless otherwise specified | 1 Months Ended |
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Mar. 31, 2013 | Jul. 31, 2012 | Mar. 31, 2012 item | Dec. 31, 2014
Sale of license of a portion of intellectual property pertaining to high-speed serial I/O technology |  |  |  |
Patent Sale and License |  |  |  |
Purchase agreement amount |  |  | $ 4.3 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = mosy_SaleOfLicenseForIntellectualPropertyMember |
Number of employees of entity's India subsidiary accepted employment in purchaser |  |  | 15 mosy_AcquisitionsAndDisposalsNumberOfEmployeesOfEntityIndiaSubsidiaryAcceptedEmploymentInPurchasingCompany / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = mosy_SaleOfLicenseForIntellectualPropertyMember |
Cash received upon execution of the agreement, net of transaction costs |  |  | 2.2 mosy_AcquisitionsAndDisposalsAcquisitionProceedsReceivedUponExecutionOfAgreement / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = mosy_SaleOfLicenseForIntellectualPropertyMember |
Holdback amount |  |  | 1.9 mosy_SignificantAcquisitionsAndDisposalsAmountOfHoldBack / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = mosy_SaleOfLicenseForIntellectualPropertyMember |
Holdback payment received | 0.6 mosy_HoldbackPaymentReceived / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = mosy_SaleOfLicenseForIntellectualPropertyMember | 1.3 mosy_HoldbackPaymentReceived / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = mosy_SaleOfLicenseForIntellectualPropertyMember |  |
Amount due |  |  |  | $ 0 mosy_SignificantAcquisitionsAndDisposalsAmountDueFromPurchaser / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = mosy_SaleOfLicenseForIntellectualPropertyMember

X
- Definition Represents the amount of cash received, net of transaction costs, upon execution of the agreement related with the acquisition or disposal. + References No definition available. + Details
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- Definition Represents the number of employees of the entity's India subsidiary who accepted employment in purchasing company on the acquisition or disposal. + References No definition available. + Details
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- Definition Represents the amount of holdback payment received by the entity. + References No definition available. + Details
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Namespace Prefix: | mosy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Represents the amount due from the purchaser under the agreement related with the acquisition or disposal. + References No definition available. + Details
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Namespace Prefix: | mosy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Represents the holdback amount that is to be paid under agreement upon providing technology transfer support services and achievement of certain contractually agreed-upon development milestones. + References No definition available. + Details
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Namespace Prefix: | mosy_
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- Definition The value of all consideration given or received by the Entity in the significant acquisition or disposal. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Details
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