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Segment, Customer Concentration and Geographical Information - Revenues Generated by Each Business Unit (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 10,544 us-gaap_SalesRevenueNet | $ 9,448 us-gaap_SalesRevenueNet | $ 8,528 us-gaap_SalesRevenueNet | $ 8,449 us-gaap_SalesRevenueNet | $ 11,843 us-gaap_SalesRevenueNet | $ 8,746 us-gaap_SalesRevenueNet | $ 10,484 us-gaap_SalesRevenueNet | $ 11,602 us-gaap_SalesRevenueNet | $ 36,979 us-gaap_SalesRevenueNet | $ 42,675 us-gaap_SalesRevenueNet | $ 43,329 us-gaap_SalesRevenueNet
Cost of revenues |  |  |  |  |  |  |  |  | 9,317 us-gaap_CostOfGoodsAndServicesSold | 9,707 us-gaap_CostOfGoodsAndServicesSold | 8,448 us-gaap_CostOfGoodsAndServicesSold
Gross profit | 8,309 us-gaap_GrossProfit | 7,247 us-gaap_GrossProfit | 6,077 us-gaap_GrossProfit | 6,029 us-gaap_GrossProfit | 9,473 us-gaap_GrossProfit | 6,254 us-gaap_GrossProfit | 8,083 us-gaap_GrossProfit | 9,158 us-gaap_GrossProfit | 27,662 us-gaap_GrossProfit | 32,968 us-gaap_GrossProfit | 34,881 us-gaap_GrossProfit
Wireless [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 31,276 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = smsi_WirelessBusinessSegmentMember | 35,853 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = smsi_WirelessBusinessSegmentMember | 37,154 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = smsi_WirelessBusinessSegmentMember
Productivity & Graphics [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 5,703 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = smsi_ProductivityAndGraphicsMember | $ 6,822 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = smsi_ProductivityAndGraphicsMember | $ 6,175 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = smsi_ProductivityAndGraphicsMember

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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