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

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- Definition Represents the number of measurements of profitability of the entity. + References No definition available. + Details
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- 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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- Details
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- 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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