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The Company and Summary of Significant Accounting Policies (Details 2) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenue Recognition    
Threshold purchase return percentage by distributors for slow, non-moving or obsolete inventory 10.00%mosy_ThresholdPurchaseReturnPercentageByDistributorsForSpecifiedPeriod  
Specified period for return of threshold percentage of purchases by distributors for slow, non-moving or obsolete inventory 6 months  
Support and maintenance revenue recognition period 12 months  
Licensing revenue $ 0us-gaap_LicensesRevenue $ 41,000us-gaap_LicensesRevenue
Net loss per share    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 10,016,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 10,173,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount