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Retirement Savings Plan (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 item	Dec. 31, 2013	Dec. 31, 2012
Retirement Savings Plan
Minimum age for eligibility to participate in the Savings Plan	21mosy_DefinedContributionPlanRequiredAgeOfEmployeesToBeEligibleForParticipationInPlan
Maximum contribution by the participants (as a percent)	15.00%mosy_DefinedContributionPlanMaximumContributionsByPlanParticipantsPercentage
Matching contribution by the Company	$ 0us-gaap_DefinedContributionPlanCostRecognized	$ 0us-gaap_DefinedContributionPlanCostRecognized	$ 0us-gaap_DefinedContributionPlanCostRecognized

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

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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

X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration