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FAIR VALUE MEASUREMENTS (Details Textual) (USD $)
1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2010
Dec. 31, 2011
Fair Value Measurement [Line Items]          
Debt Instrument, Interest Rate, Effective Percentage 5.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage 5.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage 5.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage    
Long-term Debt, Gross $ 18,614,000us-gaap_DebtInstrumentCarryingAmount $ 19,544,720us-gaap_DebtInstrumentCarryingAmount $ 18,614,000us-gaap_DebtInstrumentCarryingAmount   $ 16,876,000us-gaap_DebtInstrumentCarryingAmount
Debt Instrument, Fair Value Disclosure         3,287,700us-gaap_DebtInstrumentFairValue
Impairment Of In Process Research And Development 2,797,600tgtx_ImpairmentOfInProcessResearchAndDevelopment 0tgtx_ImpairmentOfInProcessResearchAndDevelopment 2,797,600tgtx_ImpairmentOfInProcessResearchAndDevelopment    
Convertible Notes Payable [Member]          
Fair Value Measurement [Line Items]          
Notes Issued       15,452,793us-gaap_NotesIssued1
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
 
Debt Instrument, Convertible, Conversion Price       $ 1,125us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
 
Debt Instrument, Term       5 years  
Manhattan and Ariston Pharmaceuticals Merger [Member]          
Fair Value Measurement [Line Items]          
Notes Issued       $ 15,452,793us-gaap_NotesIssued1
/ tgtx_TypeOfTransactionAxis
= tgtx_ManhattanAndAristonPharmaceuticalsMergerMember
 
Debt Instrument, Interest Rate, Effective Percentage       5.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ tgtx_TypeOfTransactionAxis
= tgtx_ManhattanAndAristonPharmaceuticalsMergerMember
 
Debt Instrument, Convertible, Conversion Price       $ 1,125us-gaap_DebtInstrumentConvertibleConversionPrice1
/ tgtx_TypeOfTransactionAxis
= tgtx_ManhattanAndAristonPharmaceuticalsMergerMember
 
Percentage Of Cash Proceeds From Operation To Repay Convertible Debt       50.00%tgtx_PercentageOfCashProceedsFromOperationToRepayConvertibleDebt
/ tgtx_TypeOfTransactionAxis
= tgtx_ManhattanAndAristonPharmaceuticalsMergerMember
 
Debt Instrument, Term       5 years