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Stock-Based Compensation (Details) (USD $) | 12 Months Ended | 0 Months Ended | 1 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 01, 2015 | Jun. 30, 2014
Options |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Unamortized compensation cost, net of expected forfeitures | $ 3,500,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember |  |  |  |
Weighted average expected period over which the expense is to be recognized | 2 years |  |  |  |
Tax benefits associated with exercise of stock options | 0 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember | 0 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember | 0 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember |  |
Inducement grant options |  |  |  |  |
Available for Grant |  |  |  |  |
Options expired (in shares) | (1,290,000)mosy_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantExpirationsInPeriod / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember |  |  |  |
Number of Shares |  |  |  |  |
Balance at the beginning of the year (in shares) | 3,178,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember | 3,358,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember | 4,815,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember |  |
Options granted (in shares) | 418,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember | 347,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember | 350,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember |  |
Options cancelled (in shares) |  | (7,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember | (550,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember |  |
Options exercised (in shares) | (73,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember | (520,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember | (1,257,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember |  |
Balance at the end of the year (in shares) | 2,233,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember | 3,178,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember | 3,358,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember |  |
Weighted Average Exercise Prices |  |  |  |  |
Balance at the beginning of the year (in dollars per share) | $ 4.42 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember | $ 4.29 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember | $ 3.29 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember |  |
Options granted (in dollars per share) | $ 3.68 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember | $ 3.94 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember | $ 3.92 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember |  |
Options cancelled (in dollars per share) |  | $ 3.45 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember | $ 1.55 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember |  |
Options exercised (in dollars per share) | $ 2.59 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember | $ 3.28 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember | $ 1.55 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember |  |
Options expired (in dollars per share) | $ 5.57 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember |  |  |  |
Balance at the end of the year (in dollars per share) | $ 3.68 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember | $ 4.42 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember | $ 4.29 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_InducementStockOptionsMember |  |
RSU's |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Unamortized compensation cost, net of expected forfeitures | $ 1,000,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |
Weighted average expected period over which the expense is to be recognized | 2 years 2 months 12 days |  |  |  |
Plans |  |  |  |  |
Available for Grant |  |  |  |  |
Restricted Stock Units Cancelled | 5,000 mosy_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriod / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |  |  |
Plans | Options |  |  |  |  |
Available for Grant |  |  |  |  |
Balance at the beginning of the year (in shares) | 422,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | 1,265,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | 1,977,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |
Additional shares authorized under the Amended 2010 Plan | 2,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | 500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | 500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |
Options granted (in shares) | (174,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | (1,543,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | (1,827,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |
Options cancelled (in shares) | 496,000 mosy_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantCancellationsInPeriod / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | 1,123,000 mosy_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantCancellationsInPeriod / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | 1,217,000 mosy_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantCancellationsInPeriod / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |
Options expired (in shares) | (481,000)mosy_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantExpirationsInPeriod / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | (888,000)mosy_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantExpirationsInPeriod / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | (602,000)mosy_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantExpirationsInPeriod / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |
Balance at the end of the year (in shares) | 1,760,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | 422,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | 1,265,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |
Number of Shares |  |  |  |  |
Balance at the beginning of the year (in shares) | 6,727,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | 6,872,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | 6,528,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |
Options granted (in shares) | 174,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | 1,543,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | 1,827,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |
Options cancelled (in shares) | (496,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | (1,123,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | (1,217,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |
Options exercised (in shares) | (411,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | (565,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | (266,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |
Balance at the end of the year (in shares) | 5,994,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | 6,727,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | 6,872,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |
Weighted Average Exercise Prices |  |  |  |  |
Balance at the beginning of the year (in dollars per share) | $ 3.86 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | $ 4.05 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | $ 4.48 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |
Options granted (in dollars per share) | $ 3.53 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | $ 4.27 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | $ 3.19 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |
Options cancelled (in dollars per share) | $ 4.31 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | $ 6.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | $ 5.42 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |
Options exercised (in dollars per share) | $ 3.06 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | $ 3.05 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | $ 2.38 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |
Options expired (in dollars per share) | $ 4.32 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | $ 6.49 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | $ 6.89 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |
Balance at the end of the year (in dollars per share) | $ 3.87 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | $ 3.86 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | $ 4.05 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |
Plans | RSU's |  |  |  |  |
Available for Grant |  |  |  |  |
Restricted stock units granted (in shares) | (508,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | (35,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |  |
Restricted Stock Units Cancelled | 5,000 mosy_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  | 3,000 mosy_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |
Options granted (in shares) | (508,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember | (35,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember |  |  |
Amended 2000 Plan |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Term of Plan | 10 years |  |  |  |
Available for Grant |  |  |  |  |
Balance at the beginning of the year (in shares) |  |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = mosy_Amended2000PlanMember |
Number of shares reserved for issuance | 4,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = mosy_Amended2000PlanMember |  |  |  |
Additional shares authorized under the Amended 2010 Plan |  |  |  | 500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = mosy_Amended2000PlanMember |
Balance at the end of the year (in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = mosy_Amended2000PlanMember |  |  |  |
Amended 2000 Plan | Options |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Maximum annual option grants or other awards to the entity's non-employee directors (in shares) | 40,000 mosy_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesReservedForAnnualGrantToNonemployeeDirectors / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = mosy_Amended2000PlanMember |  |  |  |
Maximum one-time grant of an option or other awards to the entity's non-employee directors (in shares) | 120,000 mosy_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesReservedForOneTimeGrantToNonemployeeDirectors / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = mosy_Amended2000PlanMember |  |  |  |
Maximum term of options granted | 10 years |  |  |  |
Minimum percentage of voting rights required for applicability of a specific expiration term | 10.00%mosy_ShareBasedCompensationArrangementByShareBasedPaymentAwardMinimumVotingPowerPercentageForApplicabilityOfSpecificExpirationTerm / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = mosy_Amended2000PlanMember |  |  |  |
Maximum expiration term of options granted | 5 years |  |  |  |
Vesting period | 4 years |  |  |  |
Available for Grant |  |  |  |  |
Additional shares authorized under the Amended 2010 Plan |  |  |  |  | 1,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = mosy_Amended2000PlanMember
Number of Shares |  |  |  |  |
Balance at the end of the year (in shares) | 1,048,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = mosy_Amended2000PlanMember |  |  |  |
Weighted Average Exercise Prices |  |  |  |  |
Balance at the end of the year (in dollars per share) | $ 3.79 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = mosy_EmployeeAndDirectorsStockOptionsMember / us-gaap_PlanNameAxis = mosy_Amended2000PlanMember |  |  |  |
Amended 2000 Plan | Options | Minimum |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Term of Plan | 6 years |  |  |  |
Amended 2000 Plan | Options | Maximum |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Term of Plan | 10 years |  |  |  |

X
- Definition Represents the number of equity-based payment instruments, excluding stock (or unit) options that were cancelled during the reporting period. + References No definition available. + Details
Name: | mosy_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriod
Namespace Prefix: | mosy_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the maximum expiration term of awards granted under the plan. + References No definition available. + Details
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- Definition Represents the maximum expiration term of awards granted applicable to holders of a specific percentage of voting rights of all classes of outstanding stock on the date of grant. + References No definition available. + Details
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- Definition Represents the minimum percentage of voting rights of all classes of outstanding stock, on the date of grant, held by the persons to whom awards were granted for applicability of specific expiration term of options. + References No definition available. + Details
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- Definition Represents the number of shares available for grant cancelled during the period. + References No definition available. + Details
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- Definition Represents the number of shares available for grant expired during the period. + References No definition available. + Details
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- Definition Represents the shares reserved for grant under option or other awards to the entity's non-employee directors annually under the share-based compensation plan. + References No definition available. + Details
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- Definition Represents the shares reserved for one-time grant under option or other awards to the entity's non-employee directors under the share-based compensation plan. + References No definition available. + Details
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- Definition Represents the term of share-based compensation plans. + References No definition available. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References No definition available. + Details
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- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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