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Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net sales	$ 289,323us-gaap_SalesRevenueNet	$ 225,308us-gaap_SalesRevenueNet	$ 281,370us-gaap_SalesRevenueNet
COST OF SALES	139,625us-gaap_CostOfGoodsSold	118,698us-gaap_CostOfGoodsSold	149,650us-gaap_CostOfGoodsSold
GROSS PROFIT	149,698us-gaap_GrossProfit	106,610us-gaap_GrossProfit	131,720us-gaap_GrossProfit
OPERATING EXPENSES
Research and development	60,949us-gaap_ResearchAndDevelopmentExpense	46,460us-gaap_ResearchAndDevelopmentExpense	50,975us-gaap_ResearchAndDevelopmentExpense
Sales and marketing	16,324us-gaap_SellingAndMarketingExpense	13,597us-gaap_SellingAndMarketingExpense	15,919us-gaap_SellingAndMarketingExpense
General and administrative	13,355us-gaap_GeneralAndAdministrativeExpense	11,250us-gaap_GeneralAndAdministrativeExpense	12,156us-gaap_GeneralAndAdministrativeExpense
Total operating expenses	90,628us-gaap_OperatingExpenses	71,307us-gaap_OperatingExpenses	79,050us-gaap_OperatingExpenses
OPERATING INCOME	59,070us-gaap_OperatingIncomeLoss	35,303us-gaap_OperatingIncomeLoss	52,670us-gaap_OperatingIncomeLoss
NON-OPERATING INCOME (EXPENSES)
Gain from disposal of short-term investments	4us-gaap_GainLossOnSaleOfOtherInvestments	122us-gaap_GainLossOnSaleOfOtherInvestments	2us-gaap_GainLossOnSaleOfOtherInvestments
Unrealized holding loss on short-term investment	0us-gaap_UnrealizedGainLossOnInvestments	0us-gaap_UnrealizedGainLossOnInvestments	(118)us-gaap_UnrealizedGainLossOnInvestments
Dividend income			17us-gaap_InvestmentIncomeDividend
Interest income	2,215us-gaap_InterestIncomeOther	1,845us-gaap_InterestIncomeOther	1,433us-gaap_InterestIncomeOther
Foreign exchange gain (loss), net	(606)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax	(25)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax	390us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Interest expense	(114)us-gaap_InterestExpense	(110)us-gaap_InterestExpense	(61)us-gaap_InterestExpense
Other income, net	(1)us-gaap_OtherNonoperatingIncomeExpense	13us-gaap_OtherNonoperatingIncomeExpense	1us-gaap_OtherNonoperatingIncomeExpense
Total non-operating income	1,498us-gaap_NonoperatingIncomeExpense	1,845us-gaap_NonoperatingIncomeExpense	1,664us-gaap_NonoperatingIncomeExpense
INCOME BEFORE INCOME TAX	60,568us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	37,148us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	54,334us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
INCOME TAX EXPENSE	16,101us-gaap_IncomeTaxExpenseBenefit	9,772us-gaap_IncomeTaxExpenseBenefit	7,116us-gaap_IncomeTaxExpenseBenefit
NET INCOME	$ 44,467us-gaap_NetIncomeLoss	$ 27,376us-gaap_NetIncomeLoss	$ 47,218us-gaap_NetIncomeLoss
EARNINGS PER ORDINARY SHARE:
Basic	$ 0.33us-gaap_EarningsPerShareBasic	$ 0.21us-gaap_EarningsPerShareBasic	$ 0.37us-gaap_EarningsPerShareBasic
Diluted	$ 0.33us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted	$ 0.35us-gaap_EarningsPerShareDiluted
WEIGHTED AVERAGE ORDINARY SHARES OUTSTANDING
Basic (Thousands)	134,604us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	132,259us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	129,259us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (Thousands)	136,787us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	134,567us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	134,504us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
EARNINGS PER ADS (one ADS equals four ordinary shares):
Basic	$ 1.32simo_EarningsPerShareAmericanDepositorySharesBasic	$ 0.83simo_EarningsPerShareAmericanDepositorySharesBasic	$ 1.46simo_EarningsPerShareAmericanDepositorySharesBasic
Diluted	$ 1.30simo_EarningsPerShareAmericanDepositorySharesDiluted	$ 0.81simo_EarningsPerShareAmericanDepositorySharesDiluted	$ 1.40simo_EarningsPerShareAmericanDepositorySharesDiluted
WEIGHTED AVERAGE ADS OUTSTANDING
Basic (Thousands)	33,651simo_WeightedAverageNumberOfAmericanDepositorySharesBasicSharesOutstanding	33,065simo_WeightedAverageNumberOfAmericanDepositorySharesBasicSharesOutstanding	32,315simo_WeightedAverageNumberOfAmericanDepositorySharesBasicSharesOutstanding
Diluted (Thousands)	34,197simo_WeightedAverageNumberOfAmericanDepositorySharesDilutedSharesOutstanding	33,642simo_WeightedAverageNumberOfAmericanDepositorySharesDilutedSharesOutstanding	33,626simo_WeightedAverageNumberOfAmericanDepositorySharesDilutedSharesOutstanding

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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-Name Accounting Standards Codification

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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The aggregate total amount of expenses directly related to the marketing or selling of products or services.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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