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Accounting Policies - Additional Information (Details) | Feb. 12, 2020 Customer
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Circle [Member] |
Business Acquisition [Line Items] |
Number of customer contracts | 2

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- Definition Number of customer contracts. + References No definition available. + Details
Name: | smsi_NumberOfCustomerContracts
Namespace Prefix: | smsi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=smsi_CircleMediaLabsIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |