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Balance Sheet Details - Available-for-Sale Securities Recorded at Fair Value with Unrealized Gains or Losses (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost basis | $ 2,881 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis | $ 3,079 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Gross unrealized loss | (1)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax | (1)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
Fair value | 2,880 us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent | 3,078 us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
Corporate bonds and notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost basis | 1,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = smsi_CorporateBondsAndNotesMember | 919 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = smsi_CorporateBondsAndNotesMember
Gross unrealized loss | (1)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = smsi_CorporateBondsAndNotesMember | (1)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = smsi_CorporateBondsAndNotesMember
Fair value | 999 us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = smsi_CorporateBondsAndNotesMember | 918 us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = smsi_CorporateBondsAndNotesMember
Government securities/money market [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost basis | 1,881 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 2,160 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Fair value | $ 1,881 us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | $ 2,160 us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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- Definition Amount of investments in debt securities classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 + Details
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