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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
Nov. 10, 2010
Item
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Stockholders' Equity        
Number of shares of common stock issued in equity and public offering   7,500,000    
Net proceeds from issue of shares of common stock in equity and public offering   $ 27,700 $ 27,746  
Number of shares issued to MoSys' chief executive officer   250,000    
Stockholder Rights Plan        
Number of preferred share purchase rights declared as dividend for each outstanding share of common stock 1      
Number of shares of Series AA Preferred Stock that a registered holder of right is entitled to purchase 0.001      
Preferred stock, par value (in dollars per share) $ 0.01   $ 0.01 $ 0.01
Exercise price (in dollars per one-thousandth of a share) $ 48.00      
Percentage of the company's common stock acquired by a third party upon which the rights become exercisable 15.00%      
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%      
Beneficial ownership threshold for a holder of grandfathered stock (as a percent) 20.00%      
Beneficial ownership threshold for a holder of grandfathered stock after amendment (as a percent)       15.00%