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The Company and Summary of Significant Accounting Policies (Details 2) (USD $)
0 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
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       $ 155,000us-gaap_LicensesRevenue $ 387,000us-gaap_LicensesRevenue $ 1,300,000us-gaap_LicensesRevenue
Per Share Amounts            
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount       8,817,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 10,072,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 10,384,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Numerator:            
Net loss $ (32,682,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (24,794,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (27,614,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (32,682,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (24,794,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (27,614,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Shares used in computing net loss per share:            
Basic (in dollars per share)       49,528us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 45,246us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 39,176us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in dollars per share)       49,528us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 45,246us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 39,176us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net (loss) per share:            
Basic and diluted (in dollars per share)       $ (0.66)us-gaap_EarningsPerShareBasicAndDiluted $ (0.55)us-gaap_EarningsPerShareBasicAndDiluted $ (0.70)us-gaap_EarningsPerShareBasicAndDiluted
Income Taxes            
Period over which the Company expects its unrecognized tax benefits to not change significantly       12 months    
Minimum            
Valuation of Long lived Assets            
Life       3 years    
Maximum            
Valuation of Long lived Assets            
Life       7 years    
Memory technology patents            
Intangible assets            
Number of intangible assets sold       73mosy_NumberOfFiniteLivedIntangibleAssetsSold
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mosy_MemoryTechnologyPatentsMember