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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income tax provision, Current portion:      
Federal     $ (5,000)us-gaap_CurrentFederalTaxExpenseBenefit
State 3,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 2,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 3,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign 104,000us-gaap_CurrentForeignTaxExpenseBenefit 69,000us-gaap_CurrentForeignTaxExpenseBenefit 112,000us-gaap_CurrentForeignTaxExpenseBenefit
Total 107,000us-gaap_IncomeTaxExpenseBenefit 71,000us-gaap_IncomeTaxExpenseBenefit 110,000us-gaap_IncomeTaxExpenseBenefit
Deferred tax assets:      
Federal and state loss carryforwards 50,057,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 39,455,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Reserves, accruals and other 587,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 372,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals  
Depreciation and amortization 1,497,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 1,797,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment  
Deferred stock-based compensation 3,589,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 3,793,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost  
Research and development credit carryforwards 11,351,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 9,512,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch  
Foreign tax and other credits 1,241,000mosy_DeferredTaxAssetsTaxCreditCarryforwardsForeignAndOther 1,326,000mosy_DeferredTaxAssetsTaxCreditCarryforwardsForeignAndOther  
Total deferred tax assets 68,322,000us-gaap_DeferredTaxAssetsGross 56,255,000us-gaap_DeferredTaxAssetsGross  
Deferred tax liabilities:      
Acquired intangible assets and other 1,537,000mosy_DeferredTaxLiabilitiesAcquiredIntangibleAssetsAndOther 1,618,000mosy_DeferredTaxLiabilitiesAcquiredIntangibleAssetsAndOther  
Less: Valuation allowance (66,785,000)us-gaap_DeferredTaxAssetsValuationAllowance (54,637,000)us-gaap_DeferredTaxAssetsValuationAllowance  
Increase in valuation allowance during the year 12,100,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 10,900,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount  
Federal      
Net operating loss carryforwards      
Net operating loss carryforwards, amount 133,400,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		    
Net operating loss related to excess tax benefits from stock-based compensation that will be charged to additional paid-in capital when realized 5,700,000us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		    
State      
Net operating loss carryforwards      
Net operating loss carryforwards, amount 98,400,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
Net operating loss related to excess tax benefits from stock-based compensation that will be charged to additional paid-in capital when realized $ 4,800,000us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember