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Related Parties (Details) (USD $)
3 Months Ended 0 Months Ended
Apr. 26, 2015
Apr. 10, 2015
Feb. 06, 2015
Equity Method Investee [Member]      
Related Party Transaction [Line Items]      
Equity interest percentage, equity method investment     45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_EquityMethodInvesteeMember
Loan to equity investee $ 1,200,000us-gaap_PaymentsToFundLongtermLoansToRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_EquityMethodInvesteeMember
   
Cost Method Investee [Member]      
Related Party Transaction [Line Items]      
Description of related party transaction   equity interest in Jariet, in the form of preferred stock  
Equity interest, percentage 21.00%us-gaap_NoncashOrPartNoncashAcquisitionInterestAcquired1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= smtc_CostMethodInvesteeMember
   
Fair value of contributed assets 600,000us-gaap_NoncashOrPartNoncashDivestitureAmountOfConsiderationReceived1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= smtc_CostMethodInvesteeMember
   
Revenue from related parties 400,000us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= smtc_CostMethodInvesteeMember
   
Loan | Equity Method Investee [Member]      
Related Party Transaction [Line Items]      
Related party transaction amount     1,200,000us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionAxis
= us-gaap_LoansMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_EquityMethodInvesteeMember
Description of related party transaction     an interest free loan
Loan Commitment | Equity Method Investee [Member]      
Related Party Transaction [Line Items]      
Related party transaction amount     1,200,000us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionAxis
= us-gaap_LoanOriginationCommitmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_EquityMethodInvesteeMember
Description of related party transaction     loan commitment
Credit Concentration Risk | Equity Method Investee [Member]      
Related Party Transaction [Line Items]      
Maximum exposure to credit risk $ 1,200,000us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_EquityMethodInvesteeMember