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Accrued Expenses and Other Current Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accrued Expenses and Other Current Liabilities [Line Items]
Wages and bonus	$ 12,093us-gaap_AccruedEmployeeBenefitsCurrent	$ 6,741us-gaap_AccruedEmployeeBenefitsCurrent
Research and development payable	2,468simo_AccruedResearchAndDevelopmentExpenseCurrent	3,012simo_AccruedResearchAndDevelopmentExpenseCurrent
License fees and royalties	2,982simo_AccruedLicensesCurrent	2,637simo_AccruedLicensesCurrent
Professional fees	1,714us-gaap_AccruedProfessionalFeesCurrent	1,765us-gaap_AccruedProfessionalFeesCurrent
Equipment	1,170simo_AccruedPropertyAndEquipmentCurrent	359simo_AccruedPropertyAndEquipmentCurrent
Others	3,219simo_OtherAccruedLiabilitiesOtherCurrent	3,096simo_OtherAccruedLiabilitiesOtherCurrent
Accrued expenses and other current liabilities	$ 23,646us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent	$ 17,610us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent

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Accrued Licenses, Current

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Accrued Property And Equipment Current

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Accrued Research and Development Expense, Current

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Other Accrued Liabilities, Other, Current

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Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, and other costs not separately disclosed in the balance sheet that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered.

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Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Liabilities

-URI http://asc.fasb.org/extlink&oid=6509677



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-Publisher FASB

-Name Accounting Standards Codification

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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