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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Millions	15 Months Ended	21 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Shared Services Agreement [Member]
Related Party Transaction [Line Items]
Expenses incurred	$ 0.2	$ 0.6

X

- Definition

The amount of expenses incurred for first milestone achievement.

+ References

No definition available.

+ Details

Name:	tgtx_ExpensesIncurredForFirstMilestoneAchievement
Namespace Prefix:	tgtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=tgtx_SharedServicesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: