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Fair Value of Contingent Liability (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Fair Value of Contingent Liability (Textual) [Abstract] |
Contingent Liability First Milestone Payment Cash Paid | $ 0.6
Contingent Liability Second Milestone Payment | $ 1.2

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- Definition Contingent liability first milestone payment cash paid. + References No definition available. + Details
Name: | smsi_ContingentLiabilityFirstMilestonePaymentCashPaid
Namespace Prefix: | smsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Contingent liability second milestone payment. + References No definition available. + Details
Name: | smsi_ContingentLiabilitySecondMilestonePayment
Namespace Prefix: | smsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | smsi_FairValueOfContingentLiabilityTextualAbstract
Namespace Prefix: | smsi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration