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Income Taxes (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Tax credit carryforwards
Undistributed earnings of foreign subsidiaries	$ 800,000us-gaap_UndistributedEarningsOfForeignSubsidiaries
Reconciliation of income taxes provided at the federal statutory rate (35%) to actual income tax provision (benefit)
Federal statutory rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Income tax benefit computed at U.S. statutory rate	(11,401,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	(8,653,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	(9,626,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income tax (net of federal benefit)	3,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	2,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	2,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Foreign income tax at rate different from U.S. statutory rate	(12,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(11,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(13,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Research and development credits	(1,614,000)us-gaap_IncomeTaxReconciliationTaxCreditsResearch	(1,196,000)us-gaap_IncomeTaxReconciliationTaxCreditsResearch	(691,000)us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Stock-based compensation	130,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	91,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	252,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Amortization of intangible assets	(100,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseAmortization	(100,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseAmortization	(100,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseAmortization
Valuation allowance changes affecting tax provision	13,027,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	9,915,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	10,526,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other	74,000us-gaap_IncomeTaxReconciliationOtherAdjustments	23,000us-gaap_IncomeTaxReconciliationOtherAdjustments	(240,000)us-gaap_IncomeTaxReconciliationOtherAdjustments
Total	107,000us-gaap_IncomeTaxExpenseBenefit	71,000us-gaap_IncomeTaxExpenseBenefit	110,000us-gaap_IncomeTaxExpenseBenefit
Domestic and foreign components of income (loss) before income tax provision (benefit)
U.S.	(32,735,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	(24,906,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	(27,737,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Non-U.S.	160,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	183,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	233,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Loss before income taxes	(32,575,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(24,723,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(27,504,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Federal
Tax credit carryforwards
Foreign tax credit carryforward that begin to expire in 2014	1,000,000mosy_TaxCreditCarryforwardForeignSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember
Research and development | Federal
Tax credit carryforwards
Tax credit carryforwards with expiration	7,300,000us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ResearchMember
Research and development | State
Tax credit carryforwards
Tax credit carryforwards without expiration	$ 6,200,000mosy_TaxCreditCarryforwardAmountWithoutExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ResearchMember

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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