Document and Entity Information
Mar. 10, 2022
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Mar. 10, 2022
Entity Registrant Name Oncternal Therapeutics, Inc.
Entity Central Index Key 0001260990
Entity Emerging Growth Company false
Entity File Number 000-50549
Entity Incorporation State Country Code DE
Entity Tax Identification Number 62-1715807
Entity Address, Address Line One 12230 El Camino Real
Entity Address, Address Line Two Suite 300
Entity Address, City or Town San Diego
Entity Address, State or Province CA
Entity Address, Postal Zip Code 92130
City Area Code (858)
Local Phone Number 434-1113
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, par value $0.001 per share
Trading Symbol ONCT
Security Exchange Name NASDAQ