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Restructuring - Activity in Restructuring Liability Accounts (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2014
Restructuring Cost and Reserve [Line Items] |  |
Usage | $ (400)us-gaap_PaymentsForRestructuring | $ (1,100)us-gaap_PaymentsForRestructuring
2012 Restructuring [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Beginning Balance |  | 4 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = smsi_TwoThousandTwelveRestructuringPlanMember
Provision-net |  | (4)smsi_RestructuringReserveProvisionBenefitNet / us-gaap_RestructuringPlanAxis = smsi_TwoThousandTwelveRestructuringPlanMember
2012 Restructuring [Member] | One-time employee termination benefits [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Beginning Balance |  | 4 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OneTimeTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = smsi_TwoThousandTwelveRestructuringPlanMember
Provision-net |  | (4)smsi_RestructuringReserveProvisionBenefitNet / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OneTimeTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = smsi_TwoThousandTwelveRestructuringPlanMember
2014 Restructuring [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Provision-net |  | 1,801 smsi_RestructuringReserveProvisionBenefitNet / us-gaap_RestructuringPlanAxis = smsi_TwoThousandFourteenRestructuringPlanMember
Usage |  | (1,712)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = smsi_TwoThousandFourteenRestructuringPlanMember
Ending Balance |  | 89 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = smsi_TwoThousandFourteenRestructuringPlanMember
2014 Restructuring [Member] | One-time employee termination benefits [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Provision-net |  | 1,697 smsi_RestructuringReserveProvisionBenefitNet / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OneTimeTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = smsi_TwoThousandFourteenRestructuringPlanMember
Usage |  | (1,697)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OneTimeTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = smsi_TwoThousandFourteenRestructuringPlanMember
2014 Restructuring [Member] | Fixed asset write-offs, transition travel, other [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Provision-net |  | 104 smsi_RestructuringReserveProvisionBenefitNet / us-gaap_RestructuringCostAndReserveAxis = smsi_FixedAssetsWriteDownsMember / us-gaap_RestructuringPlanAxis = smsi_TwoThousandFourteenRestructuringPlanMember
Usage |  | (15)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = smsi_FixedAssetsWriteDownsMember / us-gaap_RestructuringPlanAxis = smsi_TwoThousandFourteenRestructuringPlanMember
Ending Balance |  | 89 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = smsi_FixedAssetsWriteDownsMember / us-gaap_RestructuringPlanAxis = smsi_TwoThousandFourteenRestructuringPlanMember
2013 Restructuring [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Beginning Balance |  | 3,368 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = smsi_TwoThousandThirteenRestructuringPlanMember
Provision-net |  | 638 smsi_RestructuringReserveProvisionBenefitNet / us-gaap_RestructuringPlanAxis = smsi_TwoThousandThirteenRestructuringPlanMember
Usage |  | (1,206)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = smsi_TwoThousandThirteenRestructuringPlanMember
Ending Balance |  | 2,800 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = smsi_TwoThousandThirteenRestructuringPlanMember
2013 Restructuring [Member] | One-time employee termination benefits [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Beginning Balance |  | 215 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OneTimeTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = smsi_TwoThousandThirteenRestructuringPlanMember
Provision-net |  | (194)smsi_RestructuringReserveProvisionBenefitNet / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OneTimeTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = smsi_TwoThousandThirteenRestructuringPlanMember
Usage |  | (21)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OneTimeTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = smsi_TwoThousandThirteenRestructuringPlanMember
2013 Restructuring [Member] | Fixed asset write-offs, transition travel, other [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Beginning Balance |  | 38 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = smsi_FixedAssetsWriteDownsMember / us-gaap_RestructuringPlanAxis = smsi_TwoThousandThirteenRestructuringPlanMember
Provision-net |  | 15 smsi_RestructuringReserveProvisionBenefitNet / us-gaap_RestructuringCostAndReserveAxis = smsi_FixedAssetsWriteDownsMember / us-gaap_RestructuringPlanAxis = smsi_TwoThousandThirteenRestructuringPlanMember
Usage |  | (53)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = smsi_FixedAssetsWriteDownsMember / us-gaap_RestructuringPlanAxis = smsi_TwoThousandThirteenRestructuringPlanMember
Ending Balance |  | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = smsi_FixedAssetsWriteDownsMember / us-gaap_RestructuringPlanAxis = smsi_TwoThousandThirteenRestructuringPlanMember
2013 Restructuring [Member] | Lease/rental terminations [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Beginning Balance |  | 3,115 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = smsi_TwoThousandThirteenRestructuringPlanMember
Provision-net |  | 817 smsi_RestructuringReserveProvisionBenefitNet / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = smsi_TwoThousandThirteenRestructuringPlanMember
Usage |  | (1,132)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = smsi_TwoThousandThirteenRestructuringPlanMember
Ending Balance |  | $ 2,800 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = smsi_TwoThousandThirteenRestructuringPlanMember

X
- Definition The aggregate total amount charged against earnings for expenses incurred and estimated for restructuring pursuant to a duly authorized plan, net of any offsets or reductions in prior period estimates. + References No definition available. + Details
Name: | smsi_RestructuringReserveProvisionBenefitNet
Namespace Prefix: | smsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_PaymentsForRestructuring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_RestructuringCostAndReserveLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
Name: | us-gaap_RestructuringReserve
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_RestructuringPlanAxis=smsi_TwoThousandFourteenRestructuringPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringPlanAxis=smsi_TwoThousandThirteenRestructuringPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringPlanAxis=smsi_TwoThousandTwelveRestructuringPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |