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Consolidated Statements of Equity (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020
Condensed Consolidated Statements of Changes in Stockholders' (Deficit) Equity |  |  |
Offering costs | $ 10,900 | $ 10,900 |
Offering costs, at market | $ 1,400 | $ 2,000 | $ 500

X
- Definition Specific incremental costs directly attributable to a proposed or actual offering of securities. + References No definition available. + Details
Name: | tgtx_OfferingCosts
Namespace Prefix: | tgtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Specific incremental costs directly attributable to a At-the-Market offering of securities which are deferred at the end of the reporting period. + References No definition available. + Details
Name: | tgtx_OfferingCostsAtMarket
Namespace Prefix: | tgtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_StatementOfStockholdersEquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration