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Summary of Significant Accounting Policies (Details Textual) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 16, 2014
Dec. 10, 2014
Summary of Significant Accounting Policies Details [Line Items]          
Accounts Payable and Accrued Liabilities $ 2,900,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent $ 200,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent      
WholeSale Fees 1,600,000ig_WholesaleFees 200,000ig_WholesaleFees      
Royalty Expense 900,000us-gaap_RoyaltyExpense 1,300,000us-gaap_RoyaltyExpense      
Debt Instrument, Interest Rate, Stated Percentage 3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage   3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage    
Unrealized Gain (Loss) on Derivatives 8,625,000us-gaap_UnrealizedGainLossOnDerivatives 0us-gaap_UnrealizedGainLossOnDerivatives      
Percentage Of Net Sales For Royalty 40.00%ig_PercentageOfNetSalesForRoyalty        
Sales Revenue, Goods, Net 10,510,000us-gaap_SalesRevenueGoodsNet 6,383,000us-gaap_SalesRevenueGoodsNet      
Senior Notes [Member]          
Summary of Significant Accounting Policies Details [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_SeniorNotesMember		        
Convertible Notes Payable [Member]          
Summary of Significant Accounting Policies Details [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember		   3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember		 3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember		 3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
Notes Payable, Fair Value Disclosure 132,900,000us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember		        
Long-term Debt, Gross 143,750,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember		        
Unrealized Gain (Loss) on Derivatives 8,600,000us-gaap_UnrealizedGainLossOnDerivatives
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember		        
Sales Revenue, Net [Member] | Econazole Nitrate Cream [Member]          
Summary of Significant Accounting Policies Details [Line Items]          
Concentration Risk, Percentage 53.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ProductOrServiceAxis
= ig_EconazoleNitrateCreamMember		 15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ProductOrServiceAxis
= ig_EconazoleNitrateCreamMember		      
Customer Concentration Risk [Member]          
Summary of Significant Accounting Policies Details [Line Items]          
Concentration Risk, Percentage 69.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember		 50.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember		      
Percentage of Accounts Receivable 64.00%ig_PercentageOfAccountsReceivable
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember		        
Percent Of Revenue 10.00%ig_PercentOfRevenue
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember		        
Royalty [Member]          
Summary of Significant Accounting Policies Details [Line Items]          
Accounts Payable and Accrued Liabilities 900,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
/ us-gaap_NatureOfExpenseAxis
= ig_RoyaltyMember		 900,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
/ us-gaap_NatureOfExpenseAxis
= ig_RoyaltyMember		      
Maximum [Member] | Licensing Agreements [Member]          
Summary of Significant Accounting Policies Details [Line Items]          
Whole Saler Percent of Chargebacks 95.00%ig_WholeSalerPercentOfChargebacks
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		        
Minimum [Member] | Licensing Agreements [Member]          
Summary of Significant Accounting Policies Details [Line Items]          
Whole Saler Percent of Chargebacks 90.00%ig_WholeSalerPercentOfChargebacks
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		        
Net Of SRA Balance [Member]          
Summary of Significant Accounting Policies Details [Line Items]          
Accounts Receivable, Net 6,100,000us-gaap_AccountsReceivableNet
/ us-gaap_StatementClassOfStockAxis
= ig_NetOfSraBalanceMember		 1,500,000us-gaap_AccountsReceivableNet
/ us-gaap_StatementClassOfStockAxis
= ig_NetOfSraBalanceMember		      
Gross Net Adjustments [Member]          
Summary of Significant Accounting Policies Details [Line Items]          
Sales Revenue, Goods, Net 8,096,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementClassOfStockAxis
= ig_GrossNetAdjustmentsMember		 2,943,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementClassOfStockAxis
= ig_GrossNetAdjustmentsMember		      
IGI Product [Member]          
Summary of Significant Accounting Policies Details [Line Items]          
Sales Revenue, Goods, Net $ 8,100,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementClassOfStockAxis
= ig_IgiProductMember		 $ 2,900,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementClassOfStockAxis
= ig_IgiProductMember