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Stock Warrants (Details Textual) (USD $)
0 Months Ended
Mar. 07, 2014
Dec. 08, 2010
First Placement Agent [Member]    
Stock Warrants [Line Items]    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   338,182us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= ig_FirstPlacementAgentMember
Second Placement Agent [Member]    
Stock Warrants [Line Items]    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   16,364us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= ig_SecondPlacementAgentMember
Warrant Issuedin Connection with Private Placement Offering [Member]    
Stock Warrants [Line Items]    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)   $ 1.21us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_PlanNameAxis
= ig_WarrantIssuedinConnectionWithPrivatePlacementOfferingMember
Stock Warrants Exercised 270,546ig_StockWarrantsExercised
/ us-gaap_PlanNameAxis
= ig_WarrantIssuedinConnectionWithPrivatePlacementOfferingMember