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v2.4.1.9

Change in Allowances (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Allowances for doubtful accounts |  |  |
Balance, beginning of year | $ 1,275 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 1,634 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 2,648 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Additions (reversals) charged to expense, net | (108)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease | (359)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease | (663)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
Write-offs |  |  | (351)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Balance, end of year | 1,167 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | 1,275 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | 1,634 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Allowances for sales returns and discounts |  |  |
Balance, beginning of year | 1,059 simo_AllowanceForSalesReturnsAndDiscounts | 1,919 simo_AllowanceForSalesReturnsAndDiscounts | 2,709 simo_AllowanceForSalesReturnsAndDiscounts
Additions | 1,600 simo_AllowancesForSalesReturnsAndDiscountsAdditions | 1,320 simo_AllowancesForSalesReturnsAndDiscountsAdditions | 297 simo_AllowancesForSalesReturnsAndDiscountsAdditions
Write-offs | (1,232)simo_AllowanceForSalesReturnsAndDiscountsWriteOffs | (2,180)simo_AllowanceForSalesReturnsAndDiscountsWriteOffs | (1,087)simo_AllowanceForSalesReturnsAndDiscountsWriteOffs
Balance, end of year | $ 1,427 simo_AllowanceForSalesReturnsAndDiscounts | $ 1,059 simo_AllowanceForSalesReturnsAndDiscounts | $ 1,919 simo_AllowanceForSalesReturnsAndDiscounts

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- Definition Allowance for Sales Returns And Discounts + References No definition available. + Details
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- Definition Allowance For Sales Returns And Discounts Write Offs + References No definition available. + Details
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- Definition Allowances For Sales Returns And Discounts Additions + References No definition available. + Details
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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of increase (decrease) in the allowance for doubtful accounts. + References No definition available. + Details
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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 310 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35755819&loc=SL9156395-115594 + Details
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