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FAIR VALUE MEASUREMENTS (Details Textual) (USD $)
3 Months Ended 12 Months Ended 1 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2010
Dec. 31, 2011
Fair Value Measurement [Line Items]        
Long-term Debt, Gross $ 19,782,377us-gaap_DebtInstrumentCarryingAmount $ 19,544,720us-gaap_DebtInstrumentCarryingAmount   $ 16,876,000us-gaap_DebtInstrumentCarryingAmount
Debt Instrument, Interest Rate During Period 5.00%us-gaap_DebtInstrumentInterestRateDuringPeriod 5.00%us-gaap_DebtInstrumentInterestRateDuringPeriod    
Exchange Transaction [Member]        
Fair Value Measurement [Line Items]        
Debt Instrument, Fair Value Disclosure       3,287,700us-gaap_DebtInstrumentFairValue
/ us-gaap_StatementScenarioAxis
= tgtx_ExchangeTransactionMember
Convertible Notes Payable [Member]        
Fair Value Measurement [Line Items]        
Debt Instrument, Convertible, Conversion Price $ 1,125us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
     
Manhattan and Ariston Pharmaceuticals Merger [Member]        
Fair Value Measurement [Line Items]        
Notes Issued     $ 15,452,793us-gaap_NotesIssued1
/ 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  
Debt Instrument, Interest Rate During Period     5.00%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ tgtx_TypeOfTransactionAxis
= tgtx_ManhattanAndAristonPharmaceuticalsMergerMember