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Organization, Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 Institution ServiceProvider Business_Unit Customer | Dec. 31, 2013 ServiceProvider Customer | Dec. 31, 2012 ServiceProvider Customer
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Experience in operation period | 30 years |  |
Number of customers concentrated | 2 smsi_ConcentrationRiskNumberOfCustomersResponsibleForConcentration | 3 smsi_ConcentrationRiskNumberOfCustomersResponsibleForConcentration | 2 smsi_ConcentrationRiskNumberOfCustomersResponsibleForConcentration
Number of service providers concentrated | 1 smsi_ConcentrationRiskNumberOfServiceProvidersResponsibleForConcentration | 1 smsi_ConcentrationRiskNumberOfServiceProvidersResponsibleForConcentration | 0 smsi_ConcentrationRiskNumberOfServiceProvidersResponsibleForConcentration
Financial institutions to held securities | 2 smsi_NumberOfFinancialInstitutionsInWhichSecuritiesHeld |  |
Cash and cash equivalents original maturity dates | Three months or less |  |
Bank balances | $ 9,900,000 us-gaap_CashUninsuredAmount | $ 11,600,000 us-gaap_CashUninsuredAmount |
Inventory components | 100,000 us-gaap_InventoryRawMaterialsNetOfReserves | 100,000 us-gaap_InventoryRawMaterialsNetOfReserves |
Inventory assembled products |  | 100,000 us-gaap_InventoryFinishedGoodsNetOfReserves |
Costs capitalized | 0 us-gaap_ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost |  |
Number of operating groups | 2 us-gaap_NumberOfOperatingSegments |  |
Advertising expenses | 300,000 us-gaap_AdvertisingExpense | 400,000 us-gaap_AdvertisingExpense | 600,000 us-gaap_AdvertisingExpense
Customer Concentration Risk [Member] | Revenues [Member] |  |  |
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Concentration percentage | 79.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 77.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 61.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Customer Concentration Risk [Member] | Accounts receivable [Member] |  |  |
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Concentration percentage | 87.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 83.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 78.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Supplier concentration risk [Member] | Accounts payable [Member] |  |  |
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Concentration percentage | 27.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_LiabilitiesTotalMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember | 28.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_LiabilitiesTotalMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember |
Productivity & Graphics [Member] |  |  |
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Total sales incentives | $ 500,000 us-gaap_SalesAllowancesGoods / us-gaap_StatementBusinessSegmentsAxis = smsi_ProductivityAndGraphicsMember | $ 1,200,000 us-gaap_SalesAllowancesGoods / us-gaap_StatementBusinessSegmentsAxis = smsi_ProductivityAndGraphicsMember | $ 900,000 us-gaap_SalesAllowancesGoods / us-gaap_StatementBusinessSegmentsAxis = smsi_ProductivityAndGraphicsMember
Minimum [Member] |  |  |
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the assets | 3 years |  |
Minimum [Member] | Customer Concentration Risk [Member] | Revenues [Member] |  |  |
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Concentration percentage | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Minimum [Member] | Supplier concentration risk [Member] |  |  |
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Concentration percentage | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] |  |  |
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the assets | 7 years |  |

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- Definition An element designated to encapsulate any additional information related to cash and cash equivalents not otherwise addressed by the existing taxonomy. Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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