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

Specific incremental costs directly attributable to a At-the-Market offering of securities which are deferred at the end of the reporting period.

No definition available.

Name:	tgtx_OfferingCostsAtMarket
Namespace Prefix:	tgtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant