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Stockholders' Equity (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Nov. 10, 2010
item
$ / shares
shares
Mar. 31, 2015
USD ($)
item
shares
Jun. 30, 2013
USD ($)
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2013
USD ($)
Stockholders' Equity          
Number of shares of common stock issued in equity and public offering   14,375,000 7,500,000    
Net proceeds from issue of shares of common stock in equity and public offering | $   $ 21,400 $ 27,700 $ 21,368 $ 27,746
Number of executive officers | item   2      
Shares purchased by executive officers   406,250      
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 | item 1        
Number of shares of Series AA Preferred Stock that a registered holder of right is entitled to purchase 0.001        
Exercise price (in dollars per one-thousandth of a share) | $ / shares $ 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%