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Fair Value of Financial Instruments - Aggregate Fair Value and Carrying Value of Warrant Liability and Long-Term Debt (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 02, 2016
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Debt Instrument Fair Value Carrying Value [Abstract] |  |
Warranty liability, carrying amount | $ 1,761 |
Long-term debt, net , carrying amount | 4,000 |
Warranty liability, net, fair value | 1,761 | $ 2,100
Long-term debt, net , fair value | $ 1,766 |

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- Definition Accrued warrant liability. + References No definition available. + Details
Name: | smsi_AccruedWarrantLiability
Namespace Prefix: | smsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Debt instrument fair value carrying value. + References No definition available. + Details
Name: | smsi_DebtInstrumentFairValueCarryingValueAbstract
Namespace Prefix: | smsi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Warrant liability fair value disclosure. + References No definition available. + Details
Name: | smsi_WarrantLiabilityFairValueDisclosure
Namespace Prefix: | smsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant