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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 |  |  | 7,500,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |
Net proceeds from issue of shares of common stock in equity and public offering | $ 27,746 us-gaap_ProceedsFromIssuanceOfCommonStock |  | $ 27,700 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |
Number of shares issued to MoSys' chief executive officer |  |  | 250,000 mosy_NumberOfSharesIssuedToMoSysChiefExecutiveOfficer |  |  |
Stockholder Rights Plan |  |  |  |  |  |
Number of preferred share purchase rights declared as dividend for each outstanding share of common stock |  | 1 mosy_PreferredStockDividendsNumberOfPreferredSharePurchaseRightsDistributedForEachShareOfCommonStockOutstanding |  |  |  |
Number of shares of Series AA Preferred Stock that a registered holder of right is entitled to purchase |  | 0.001 mosy_PreferredSharePurchaseRightsSharesPerRight |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare |  | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare
Exercise price (in dollars per one-thousandth of a share) |  | $ 48.00 us-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 |  |

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- Definition Represents the percentage of the entity's common stock to be considered as beneficial ownership threshold for a holder of grandfathered stock after amendment. + References No definition available. + Details
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- Definition Represents information pertaining to the number of shares purchased by MoSys' chief executive officer at the public offering price. + References No definition available. + Details
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- Definition Represents the minimum percentage of the entity's common stock that must receive a tender offer to purchase by a third party upon which the rights become exercisable. + References No definition available. + Details
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