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Business Segments and Significant Customers (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 item	Dec. 31, 2013	Dec. 31, 2012
Business Segments, Concentration of Credit Risk and Significant Customers
Number of business segments	1us-gaap_NumberOfOperatingSegments
Number of measurements of profitability	1mosy_NumberOfMeasurementsOfProfitability
Business Segments
Total net revenue	$ 5,380us-gaap_SalesRevenueNet	$ 4,398us-gaap_SalesRevenueNet	$ 6,082us-gaap_SalesRevenueNet
Taiwan
Business Segments
Total net revenue	1,894us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW	1,831us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW	1,700us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW
Japan
Business Segments
Total net revenue	1,961us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP	1,207us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP	1,571us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP
North America
Business Segments
Total net revenue	1,485us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember	1,318us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember	2,511us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember
Rest of Asia
Business Segments
Total net revenue	28us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = mosy_RestOfAsiaMember	42us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = mosy_RestOfAsiaMember	214us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = mosy_RestOfAsiaMember
Europe
Business Segments
Total net revenue	$ 12us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember		$ 86us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember

X

- Definition

Represents the number of measurements of profitability of the entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	mosy_
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Balance Type:	na
Period Type:	duration

X

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
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- Details

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X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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