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Consolidated Balance Sheets and Statements of Operations and Comprehensive Loss Components (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Inventories:
Work-in-process	$ 651us-gaap_InventoryWorkInProcess	$ 542us-gaap_InventoryWorkInProcess
Finished goods	230us-gaap_InventoryFinishedGoods	25us-gaap_InventoryFinishedGoods
Inventories	881us-gaap_InventoryNet	567us-gaap_InventoryNet
Prepaid expenses and other:
Interest receivable	160us-gaap_InterestReceivableCurrent	382us-gaap_InterestReceivableCurrent
Prepaid insurance	143us-gaap_PrepaidInsurance	127us-gaap_PrepaidInsurance
Prepaid expenses and other	584us-gaap_PrepaidExpenseAndOtherAssets	595us-gaap_PrepaidExpenseAndOtherAssets
Total	887us-gaap_PrepaidExpenseAndOtherAssetsCurrent	1,104us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Property and equipment, net:
Property and equipment, gross	5,005us-gaap_PropertyPlantAndEquipmentGross	4,609us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation and amortization	(4,151)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	(3,903)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net	854us-gaap_PropertyPlantAndEquipmentNet	706us-gaap_PropertyPlantAndEquipmentNet
Equipment, furniture and fixtures and leasehold improvements
Property and equipment, net:
Property and equipment, gross	4,255us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = mosy_EquipmentFurnitureFixturesAndLeaseholdImprovementsMember	3,923us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = mosy_EquipmentFurnitureFixturesAndLeaseholdImprovementsMember
Acquired software
Property and equipment, net:
Property and equipment, gross	$ 750us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember	$ 686us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember

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