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v3.20.1

Revenues - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2019
Disaggregation Of Revenue [Abstract] |
Sales return period | 30 days

X
- Definition Allowable sales return period to end users. + References No definition available. + Details
Name: | smsi_AllowableSalesReturnPeriodToEndUsers
Namespace Prefix: | smsi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DisaggregationOfRevenueAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration