Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Aug. 02, 2019
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Entity Registrant Name	TG THERAPEUTICS, INC.
Entity File Number	000-30929
Entity Tax Identification Number	36-3898269
Entity Address, Address Line One	2 Gansevoort Street, 9th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10014
City Area Code	212
Local Phone Number	554-4484
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock Shares Outstanding		94,755,151
Security 12b Title	Common Stock, par value $0.001
Document Period End Date	Jun. 30, 2019
Trading Symbol	TGTX
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Security Exchange Name	NASDAQ
Entity Incorporation, State or Country Code	DE
Entity Central Index Key	0001001316
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2019