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Business Segments and Significant Customers (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Significant Customers |  |  |
Property, Plant and Equipment, Net | 854 us-gaap_PropertyPlantAndEquipmentNet | 706 us-gaap_PropertyPlantAndEquipmentNet |
Total revenues | Customer concentration risk | Customer A |  |  |
Significant Customers |  |  |
Percentage of concentration risk | 34.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = mosy_CustomerAMember | 41.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = mosy_CustomerAMember | 28.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = mosy_CustomerAMember
Total revenues | Customer concentration risk | Customer B |  |  |
Significant Customers |  |  |
Percentage of concentration risk | 31.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = mosy_CustomerBMember |  |
Total revenues | Customer concentration risk | Customer C |  |  |
Significant Customers |  |  |
Percentage of concentration risk | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = mosy_CustomerCMember | 13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = mosy_CustomerCMember | 26.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = mosy_CustomerCMember
Total revenues | Customer concentration risk | Customer D |  |  |
Significant Customers |  |  |
Percentage of concentration risk |  |  | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = mosy_CustomerDMember
Net accounts receivable | Credit concentration | Three customers |  |  |
Significant Customers |  |  |
Percentage of concentration risk | 97.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / us-gaap_MajorCustomersAxis = mosy_ThreeCustomersMember |  |
Number of customers | 3 mosy_ConcentrationRiskNumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / us-gaap_MajorCustomersAxis = mosy_ThreeCustomersMember |  |
Net accounts receivable | Credit concentration | Two customers |  |  |
Significant Customers |  |  |
Percentage of concentration risk |  | 96.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / us-gaap_MajorCustomersAxis = mosy_TwoCustomersMember |
Number of customers |  | 2 mosy_ConcentrationRiskNumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / us-gaap_MajorCustomersAxis = mosy_TwoCustomersMember |
U.S. |  |  |
Significant Customers |  |  |
Property, Plant and Equipment, Net | 766 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US | 610 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US |
Non-U.S. |  |  |
Significant Customers |  |  |
Property, Plant and Equipment, Net | 88 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = mosy_SegmentGeographicalGroupsOfCountriesGroupThreeMember | 96 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = mosy_SegmentGeographicalGroupsOfCountriesGroupThreeMember |

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