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Income Taxes (Details 2) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Tax credit carryforwards |  |  |
Undistributed earnings of foreign subsidiaries | $ 800,000 us-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) | 3,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 2,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 2,000 us-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 | 130,000 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 91,000 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 252,000 us-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 | 13,027,000 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 9,915,000 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 10,526,000 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other | 74,000 us-gaap_IncomeTaxReconciliationOtherAdjustments | 23,000 us-gaap_IncomeTaxReconciliationOtherAdjustments | (240,000)us-gaap_IncomeTaxReconciliationOtherAdjustments
Total | 107,000 us-gaap_IncomeTaxExpenseBenefit | 71,000 us-gaap_IncomeTaxExpenseBenefit | 110,000 us-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. | 160,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 183,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 233,000 us-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 | 1,000,000 mosy_TaxCreditCarryforwardForeignSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |
Research and development | Federal |  |  |
Tax credit carryforwards |  |  |
Tax credit carryforwards with expiration | 7,300,000 us-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 | $ 6,200,000 mosy_TaxCreditCarryforwardAmountWithoutExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ResearchMember |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318 + Details
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