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Consolidated Statements Of Changes In Shareholders' Equity (USD $)
In Thousands
Total
Ordinary Shares
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings (accumulated deficit)
Treasury Stock
BEGINNING BALANCE at Dec. 31, 2011 $ 201,500us-gaap_StockholdersEquity $ 1,246us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 161,968us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 2,055us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 36,231us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
BEGINNING BALANCE (in shares) at Dec. 31, 2011   124,572us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Net income 47,218us-gaap_NetIncomeLoss       47,218us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Other comprehensive income 1,610us-gaap_OtherComprehensiveIncomeLossNetOfTax     1,610us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
   
Stock-based compensation expenses 11,802us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue   11,802us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Issuance of ordinary shares upon exercise of employee stock options and restricted stock units, shares   5,468simo_IssuanceOfOrdinarySharesUponExerciseOfEmployeeStockOptionsAndRestrictedStockUnitsShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Issuance of ordinary shares upon exercise of employee stock options and restricted stock units 136simo_IssuanceOfOrdinarySharesUponExerciseOfEmployeeStockOptionsAndRestrictedStockUnitsValue 54simo_IssuanceOfOrdinarySharesUponExerciseOfEmployeeStockOptionsAndRestrictedStockUnitsValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
82simo_IssuanceOfOrdinarySharesUponExerciseOfEmployeeStockOptionsAndRestrictedStockUnitsValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Ending Balance at Dec. 31, 2012 262,266us-gaap_StockholdersEquity 1,300us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
173,852us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
3,665us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
83,449us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Ending Balance (in shares) at Dec. 31, 2012   130,040us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Net income 27,376us-gaap_NetIncomeLoss       27,376us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Other comprehensive income 430us-gaap_OtherComprehensiveIncomeLossNetOfTax     430us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
   
Stock-based compensation expenses 10,262us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue   10,262us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Issuance of ordinary shares upon exercise of employee stock options and restricted stock units, shares   5,154simo_IssuanceOfOrdinarySharesUponExerciseOfEmployeeStockOptionsAndRestrictedStockUnitsShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Issuance of ordinary shares upon exercise of employee stock options and restricted stock units 346simo_IssuanceOfOrdinarySharesUponExerciseOfEmployeeStockOptionsAndRestrictedStockUnitsValue 52simo_IssuanceOfOrdinarySharesUponExerciseOfEmployeeStockOptionsAndRestrictedStockUnitsValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
294simo_IssuanceOfOrdinarySharesUponExerciseOfEmployeeStockOptionsAndRestrictedStockUnitsValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Share repurchase (10,018)us-gaap_TreasuryStockValueAcquiredCostMethod         (10,018)us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
Dividends declared (US$0.15 per ordinary share) (19,965)us-gaap_DividendsCommonStockCash       (19,965)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Treasury stock retired, shares   (3,564)us-gaap_TreasuryStockSharesRetired
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Treasury stock retired   (36)us-gaap_TreasuryStockRetiredCostMethodAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(4,392)us-gaap_TreasuryStockRetiredCostMethodAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
  (5,590)us-gaap_TreasuryStockRetiredCostMethodAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
10,018us-gaap_TreasuryStockRetiredCostMethodAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
Ending Balance at Dec. 31, 2013 270,697us-gaap_StockholdersEquity 1,316us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
180,016us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
4,095us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
85,270us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Ending Balance (in shares) at Dec. 31, 2013   131,630us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Net income 44,467us-gaap_NetIncomeLoss       44,467us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Other comprehensive income (1,590)us-gaap_OtherComprehensiveIncomeLossNetOfTax     (1,590)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
   
Stock-based compensation expenses 10,347us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue   10,347us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Issuance of ordinary shares upon exercise of employee stock options and restricted stock units, shares   3,992simo_IssuanceOfOrdinarySharesUponExerciseOfEmployeeStockOptionsAndRestrictedStockUnitsShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Issuance of ordinary shares upon exercise of employee stock options and restricted stock units 460simo_IssuanceOfOrdinarySharesUponExerciseOfEmployeeStockOptionsAndRestrictedStockUnitsValue 40simo_IssuanceOfOrdinarySharesUponExerciseOfEmployeeStockOptionsAndRestrictedStockUnitsValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
420simo_IssuanceOfOrdinarySharesUponExerciseOfEmployeeStockOptionsAndRestrictedStockUnitsValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Dividends declared (US$0.15 per ordinary share) (20,281)us-gaap_DividendsCommonStockCash       (20,281)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Ending Balance at Dec. 31, 2014 $ 304,100us-gaap_StockholdersEquity $ 1,356us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 190,783us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 2,505us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 109,456us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Ending Balance (in shares) at Dec. 31, 2014   135,622us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember