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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 |  |  |  | $ 155,000 us-gaap_LicensesRevenue | $ 387,000 us-gaap_LicensesRevenue | $ 1,300,000 us-gaap_LicensesRevenue
Per Share Amounts |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  | 8,817,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 10,072,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 10,384,000 us-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) |  |  |  | 49,528 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 45,246 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 39,176 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in dollars per share) |  |  |  | 49,528 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 45,246 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 39,176 us-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 |  |  |  | 73 mosy_NumberOfFiniteLivedIntangibleAssetsSold / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mosy_MemoryTechnologyPatentsMember |  |

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- Definition Revenue earned during the period relating to consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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