Condensed Consolidated Statements of Equity (Parenthetical) $ in Thousands	Mar. 31, 2020 USD ($)
Statement of Stockholders' Equity [Abstract]
Offering costs, at market	$ 200

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