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Segment, Customer Concentration and Geographical Information - Company's Customers that Represent 10% or More of Company's Net Revenues (Detail) (Revenues [Member], Customer Concentration Risk [Member]) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenue from External Customer [Line Items] |  |  |
Customer concentrating on 10% or more of net revenue | 79.20%us-gaap_ConcentrationRiskPercentage1 | 77.50%us-gaap_ConcentrationRiskPercentage1 | 61.20%us-gaap_ConcentrationRiskPercentage1
Wireless [Member] | Sprint and affiliates [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Customer concentrating on 10% or more of net revenue | 68.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = smsi_SprintMember / us-gaap_StatementBusinessSegmentsAxis = smsi_WirelessBusinessSegmentMember | 53.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = smsi_SprintMember / us-gaap_StatementBusinessSegmentsAxis = smsi_WirelessBusinessSegmentMember | 40.70%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = smsi_SprintMember / us-gaap_StatementBusinessSegmentsAxis = smsi_WirelessBusinessSegmentMember
Wireless [Member] | Verizon Wireless and affiliates [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Customer concentrating on 10% or more of net revenue | 7.80%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = smsi_VerizonWirelessMember / us-gaap_StatementBusinessSegmentsAxis = smsi_WirelessBusinessSegmentMember | 13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = smsi_VerizonWirelessMember / us-gaap_StatementBusinessSegmentsAxis = smsi_WirelessBusinessSegmentMember | 20.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = smsi_VerizonWirelessMember / us-gaap_StatementBusinessSegmentsAxis = smsi_WirelessBusinessSegmentMember
Productivity & Graphics [Member] | FastSpring [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Customer concentrating on 10% or more of net revenue | 11.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = smsi_FastSpringMember / us-gaap_StatementBusinessSegmentsAxis = smsi_ProductivityAndGraphicsMember | 11.40%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = smsi_FastSpringMember / us-gaap_StatementBusinessSegmentsAxis = smsi_ProductivityAndGraphicsMember |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration