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Stock-Based Compensation - Additional Information (Detail) (USD $) | 12 Months Ended |  |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 11, 2007 | Jul. 28, 2005
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercise of common stock options, shares | 4,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  | 32,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |
Cash proceeds from exercise of common stock options | $ 6,000 us-gaap_ProceedsFromStockOptionsExercised |  | $ 16,000 us-gaap_ProceedsFromStockOptionsExercised |  |
Weighted average grant-date fair value of stock options granted | $ 0.57 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 0.63 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 0.80 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum number of shares available for issuance under plan | 1,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = smsi_EmployeeStockPurchasePlanMember |  |  |  |
Percentage of market value | 85.00%smsi_PercentageOfFairMarketValueOfShare / us-gaap_AwardTypeAxis = smsi_EmployeeStockPurchasePlanMember |  |  |  |
Percentage of employee's payroll deductions limited to employee's compensation | 10.00%smsi_PercentageOfEmployeeCompensationForEmployeePayrollDeduction / us-gaap_AwardTypeAxis = smsi_EmployeeStockPurchasePlanMember |  |  |  |
Maximum Stock value of shares purchased by employees if one thousand shares purchased | 25,000 smsi_MaximumStockValueOfSharesPurchasedByEmployees / us-gaap_AwardTypeAxis = smsi_EmployeeStockPurchasePlanMember |  |  |  |
Maximum number of shares that employee can purchase each period | 1,000 smsi_MaximumSharesPurchasedByEmployees / us-gaap_AwardTypeAxis = smsi_EmployeeStockPurchasePlanMember |  |  |  |
Restricted stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Cash payment of income taxes related to grants included in share-based compensation | 200,000 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 400,000 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 400,000 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |
Restricted stock [Member] | Board of Directors non-employee [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock vesting period | 12 months |  |  |  |
Restricted stock shares granted | 50,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = smsi_BoardOfDirectorsNonEmployeeMember |  |  |  |
Value of restricted stock granted | 100,000 smsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantedAggregateValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = smsi_BoardOfDirectorsNonEmployeeMember |  |  |  |
Restricted stock [Member] | Key officers and employees [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock vesting period | 48 months |  |  |  |
Restricted stock shares granted | 1,600,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = smsi_KeyOfficersAndEmployeeMember |  |  |  |
Value of restricted stock granted | 2,800,000 smsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantedAggregateValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = smsi_KeyOfficersAndEmployeeMember |  |  |  |
Stock options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercise of common stock options, shares | 4,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Cash proceeds from exercise of common stock options | 6,000 us-gaap_ProceedsFromStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Unrecognized compensation costs related to non-vested awards granted | $ 3,300,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
1995 Stock Option Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
1995 Stock option expiry date | May 24, 2005 |  |  |  |
2005 Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock vesting period | 4 years |  |  |  |
Stock option expiration period | 10 years |  |  |  |
Additional shares authorized, percent | 2.50%smsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorizedPercentage / us-gaap_PlanNameAxis = smsi_TwoThousandFiveStockOptionPlanMember |  |  |  |
Number of additional shares authorized | 750,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = smsi_TwoThousandFiveStockOptionPlanMember |  |  |  |
Number of shares available for future grants | 1,600,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = smsi_TwoThousandFiveStockOptionPlanMember |  |  |  |
2005 Plan [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock vesting period | 48 months |  |  |  |
2005 Plan [Member] | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum number of shares available for issuance under plan |  |  |  | 7,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = smsi_TwoThousandFiveStockOptionPlanMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 5,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = smsi_TwoThousandFiveStockOptionPlanMember / us-gaap_RangeAxis = us-gaap_MinimumMember
2005 Plan [Member] | Restricted stock [Member] | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock vesting period | 12 months |  |  |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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