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Segment, Customer Concentration and Geographical Information - Additional Information (Detail)
 3 Months Ended
Mar. 31, 2015
Location
Customer
Business_Unit
Mar. 31, 2014
Location
Customer
Revenue, Major Customer [Line Items]    
Number of primary business units 2us-gaap_NumberOfOperatingSegments  
Number of customers that contribute more than 10% of revenue 3smsi_NumberOfCustomers 3smsi_NumberOfCustomers
Number of geographic locations 3smsi_NumberOfGeographicLocation 3smsi_NumberOfGeographicLocation
Credit Concentration Risk [Member] | Accounts receivable [Member] | Sprint, Comcast and Fast Spring [Member]    
Revenue, Major Customer [Line Items]    
Percentage of concentration 90.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= smsi_SprintComcastAndFastSpringMember		 90.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= smsi_SprintComcastAndFastSpringMember