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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
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     $ 4.3us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= mosy_SaleOfLicenseForIntellectualPropertyMember		  
Number of employees of entity's India subsidiary accepted employment in purchaser     15mosy_AcquisitionsAndDisposalsNumberOfEmployeesOfEntityIndiaSubsidiaryAcceptedEmploymentInPurchasingCompany
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= mosy_SaleOfLicenseForIntellectualPropertyMember		  
Cash received upon execution of the agreement, net of transaction costs     2.2mosy_AcquisitionsAndDisposalsAcquisitionProceedsReceivedUponExecutionOfAgreement
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= mosy_SaleOfLicenseForIntellectualPropertyMember		  
Holdback amount     1.9mosy_SignificantAcquisitionsAndDisposalsAmountOfHoldBack
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= mosy_SaleOfLicenseForIntellectualPropertyMember		  
Holdback payment received 0.6mosy_HoldbackPaymentReceived
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= mosy_SaleOfLicenseForIntellectualPropertyMember		 1.3mosy_HoldbackPaymentReceived
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= mosy_SaleOfLicenseForIntellectualPropertyMember		    
Amount due       $ 0mosy_SignificantAcquisitionsAndDisposalsAmountDueFromPurchaser
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= mosy_SaleOfLicenseForIntellectualPropertyMember