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Consolidated Statement of Stockholders' Equity (Parenthetical) $ in Thousands | 9 Months Ended
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Sep. 30, 2017 USD ($)
Series B Preferred Stock [Member] |
Shares issued in Series B preferred stock offering, issuance costs | $ 287

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- Definition Shares issued in preferred stock offering issuance costs. + References No definition available. + Details
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Namespace Prefix: | smsi_
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Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |