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Retirement Savings Plan (Details)	12 Months Ended
	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