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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