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Stockholder's Equity (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2013
Stockholder's Equity |  |
Number of shares of common stock issued in public offering | 7,500,000 |
Net proceeds from issue of shares of common stock in equity offering | $ 27,700,000 | $ 27,890,000
Number of shares issued to MoSys' chief executive officer |  | 250,000
Issuance costs related to public offering |  | $ 145,000

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