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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%

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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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