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Retail Access and Distribution Agreement (Details) - Valassis - USD ($) |  | 12 Months Ended
--- | --- | ---
Aug. 11, 2014 | Dec. 31, 2015 | Dec. 31, 2014
Retail access and distribution agreement |  |  |
Marketing and service agreement amortization period | 4 years |  |
Total consideration paid for marketing and service agreement | $ 250,000 |  |
Carrying value of agreement included on other assets |  | $ 128,000 |
Marketing and Service Agreement Amortization expense |  | $ 64,000 | $ 59,000

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- Definition Represents the amount of carrying value of agreement included in other assets. + References No definition available. + Details
Name: | isig_CarryingValueOfMarketingAndServiceAgreementIncludedInOtherAssets
Namespace Prefix: | isig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the amortization expenses for a marketing and service agreement. + References No definition available. + Details
Name: | isig_MarketingAndServiceAgreementAmortizationExpense
Namespace Prefix: | isig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the amortization period for a marketing and service agreement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | isig_MarketingAndServiceAgreementAmortizationPeriod
Namespace Prefix: | isig_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Represents the amount of total consideration paid for marketing and service agreement. + References No definition available. + Details
Name: | isig_TotalConsiderationPaidForMarketingAndServiceAgreement
Namespace Prefix: | isig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | dei_LegalEntityAxis=isig_ValassisSalesAndMarketingServicesIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |