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Retirement Savings Plan (Details) | 12 Months Ended
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Dec. 31, 2012 Item
Retirement Savings Plan |
Minimum age for eligibility to participate in the Savings Plan | 21
Maximum contribution by the participants (as a percent) | 15.00%

X
- Definition Represents the maximum contribution to a defined contribution plan as a percentage of eligible earnings of employees, subject to a statutorily prescribed annual limit. + References No definition available. + Details
Name: | mosy_DefinedContributionPlanMaximumContributionsByPlanParticipantsPercentage
Namespace Prefix: | mosy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the minimum age limit for participating in the defined contribution plan covering full-time and part-time employees of the entity. + References No definition available. + Details
Name: | mosy_DefinedContributionPlanRequiredAgeOfEmployeesToBeEligibleForParticipationInPlan
Namespace Prefix: | mosy_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DefinedContributionPensionAndOtherPostretirementPlansDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration