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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net revenue
Product	$ 180us-gaap_SalesRevenueGoodsNet	$ 581us-gaap_SalesRevenueGoodsNet
Royalty and other	596mosy_RoyaltyAndOtherRevenue	751mosy_RoyaltyAndOtherRevenue
Total net revenue	776us-gaap_SalesRevenueNet	1,332us-gaap_SalesRevenueNet
Cost of net revenue	237us-gaap_CostOfGoodsAndServicesSold	577us-gaap_CostOfGoodsAndServicesSold
Gross profit	539us-gaap_GrossProfit	755us-gaap_GrossProfit
Operating expenses
Research and development	6,893us-gaap_ResearchAndDevelopmentExpense	7,054us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative	1,614us-gaap_SellingGeneralAndAdministrativeExpense	1,797us-gaap_SellingGeneralAndAdministrativeExpense
Total operating expenses	8,507us-gaap_OperatingExpenses	8,851us-gaap_OperatingExpenses
Loss from operations	(7,968)us-gaap_OperatingIncomeLoss	(8,096)us-gaap_OperatingIncomeLoss
Other income, net	23us-gaap_OtherNonoperatingIncomeExpense	30us-gaap_OtherNonoperatingIncomeExpense
Loss before income taxes	(7,945)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(8,066)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax provision	20us-gaap_IncomeTaxExpenseBenefit	21us-gaap_IncomeTaxExpenseBenefit
Net loss	(7,965)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	(8,087)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Other comprehensive income (loss), net of tax:
Net unrealized gains (losses) on available-for-sale securities	6us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	(9)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Comprehensive loss	$ (7,959)us-gaap_ComprehensiveIncomeNetOfTax	$ (8,096)us-gaap_ComprehensiveIncomeNetOfTax
Net loss per share
Basic and diluted (in dollars per share)	$ (0.15)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.16)us-gaap_EarningsPerShareBasicAndDiluted
Shares used in computing net loss per share
Basic and diluted (in shares)	54,282us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	49,174us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted

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Represents the amount of revenue earned during the period from the leasing or otherwise lending to a third party the entity's rights or title to certain property and revenues from the sale of other goods or rendering of other services, not elsewhere specified in the taxonomy; net of (reduced by) sales adjustments, returns, allowances, and discounts.

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