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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 People | Dec. 31, 2012 | Sep. 26, 2011
Leases [Abstract] |  |  |  |
Expiration of non-cancellable operating leases | Through 2022 |  |  |
Accrued lease commitments expense | $ 5.6 smsi_AccruedLeaseExpenses |  |  |
Estimated sublease income | 3.0 smsi_OperatingLeasesExpectedFutureSubleaseIncome |  |  |
Rent expense under operating leases | 1.2 us-gaap_OperatingLeasesRentExpenseNet | 2.4 us-gaap_OperatingLeasesRentExpenseNet | 2.7 us-gaap_OperatingLeasesRentExpenseNet |
Incentives per square feet | 40.00 smsi_IncentivesPricePerSquareFoot |  |  |
Incentives for improvements to space | 2.2 smsi_LeaseIncentiveAmountForImprovementOfSpace |  |  |
Amount received to start-up new facility |  |  |  | $ 1.0 smsi_ProceedsFromGovernmentGrantForStartUpNewFacility
Minimum number of people to be employed |  | 232 smsi_MinimumNumberOfPeopleToBeEmployed |  |
Time period to meet employment commitment |  | 3 years |  |
New deadline to meet employment commitment | Feb. 28, 2015 |  |  |

X
- Definition Portion of future lease payments accrued as part of 2013 Restructuring Plan. + References No definition available. + Details
Name: | smsi_AccruedLeaseExpenses
Namespace Prefix: | smsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Extension of time for performance under the grant terms. + References No definition available. + Details
Name: | smsi_ExtendedPeriodInWhichPeopleToBeEmployed
Namespace Prefix: | smsi_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of lease incentives per square foot received from landlord for the improvement of space. + References No definition available. + Details
Name: | smsi_IncentivesPricePerSquareFoot
Namespace Prefix: | smsi_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount provided by lessor for the improvement of space. + References No definition available. + Details
Name: | smsi_LeaseIncentiveAmountForImprovementOfSpace
Namespace Prefix: | smsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Minimum number of people agreed to employ in exchange for start up grant. + References No definition available. + Details
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Namespace Prefix: | smsi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated income to be received from sublease of office space. + References No definition available. + Details
Name: | smsi_OperatingLeasesExpectedFutureSubleaseIncome
Namespace Prefix: | smsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of time in which to employ minimum number of people under initial terms of the grant. + References No definition available. + Details
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Namespace Prefix: | smsi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount received from State of Pennsylvania to help fund the start up of new facility. + References No definition available. + Details
Name: | smsi_ProceedsFromGovernmentGrantForStartUpNewFacility
Namespace Prefix: | smsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition A general description of the nature of the existing leasing arrangements of a lessee for all operating leases including, but not limited to: (1) rental escalation clauses; (2) renewal or purchase options; (3) guarantees or indemnities, if any, (4) restrictions imposed by lease arrangements; (5) unusual provisions or conditions; (6) contingent rentals, if any; and (7) lease expiration dates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6452660&loc=d3e36991-112694 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 1) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Details
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Data Type: | xbrli:stringItemType
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X
- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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