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Retail Access and Distribution Agreement (Details) (Valassis, USD $)
0 Months Ended 12 Months Ended
Aug. 11, 2014
Dec. 31, 2014
Aug. 11, 2014
Valassis
     
Retail access and distribution agreement      
Marketing and service agreement amortization period 4 years    
Total consideration paid for marketing and service agreement $ 250,000isig_TotalConsiderationPaidForMarketingAndServiceAgreement
/ dei_LegalEntityAxis
= isig_ValassisSalesAndMarketingServicesIncMember
  $ 250,000isig_TotalConsiderationPaidForMarketingAndServiceAgreement
/ dei_LegalEntityAxis
= isig_ValassisSalesAndMarketingServicesIncMember
Carrying value of agreement included on other assets   191,000isig_CarryingValueOfMarketingAndServiceAgreementIncludedInOtherAssets
/ dei_LegalEntityAxis
= isig_ValassisSalesAndMarketingServicesIncMember
 
Marketing and Service Agreement Amortization expense   $ 59,000isig_MarketingAndServiceAgreementAmortizationExpense
/ dei_LegalEntityAxis
= isig_ValassisSalesAndMarketingServicesIncMember