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Summary of Notes and Accounts Receivable (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounts and Other Receivables [Line Items]
Notes receivable	$ 192	$ 251
Trade accounts receivable	31,256simo_TradeAccountsReceivableGross	33,296simo_TradeAccountsReceivableGross
Trade Accounts And Notes Receivable Gross Current	31,448	33,547
Allowance for doubtful accounts	(1,167)	(1,275)	(1,634)	(2,648)
Allowance for sales returns and discounts	(1,427)	(1,059)	(1,919)	(2,709)
Notes and accounts receivable, net	$ 28,854	$ 31,213

An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date(s) within one year of the balance sheet date or the normal operating cycle, whichever is longer. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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