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Stockholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Nov. 10, 2010
item
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Stockholders' Equity            
Number of shares of common stock issued in equity and public offering     7,500,000us-gaap_StockIssuedDuringPeriodSharesNewIssues      
Net proceeds from issue of shares of common stock in equity and public offering $ 27,746us-gaap_ProceedsFromIssuanceOfCommonStock   $ 27,700us-gaap_ProceedsFromIssuanceOfCommonStock      
Number of shares issued to MoSys' chief executive officer     250,000mosy_NumberOfSharesIssuedToMoSysChiefExecutiveOfficer      
Stockholder Rights Plan            
Number of preferred share purchase rights declared as dividend for each outstanding share of common stock   1mosy_PreferredStockDividendsNumberOfPreferredSharePurchaseRightsDistributedForEachShareOfCommonStockOutstanding        
Number of shares of Series AA Preferred Stock that a registered holder of right is entitled to purchase   0.001mosy_PreferredSharePurchaseRightsSharesPerRight        
Preferred Stock, Par or Stated Value Per Share   $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare   $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Exercise price (in dollars per one-thousandth of a share)   $ 48.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1        
Percentage of the company's common stock acquired by a third party upon which the rights become exercisable       15.00%mosy_PreferredSharePurchaseRightsPercentageOwnershipOfOutstandingCommonStockForExercise    
Minimum percentage of the company's common stock that must receive a tender offer from a third party upon which the rights become exercisable       15.00%mosy_PreferredSharePurchaseRightsMinimumPercentageOwnershipOfferToPurchaseCommonStock    
Beneficial ownership threshold for a holder of grandfathered stock (as a percent)   20.00%mosy_CommonStockBeneficialOwnershipThresholdForHolderOfGrandfatheredStockPercentage        
Beneficial ownership threshold for a holder of grandfathered stock after amendment (as a percent)       15.00%mosy_CommonStockBeneficialOwnershipThresholdForHolderOfGrandfatheredStockPercentageAfterAmendment