v3.22.2.2
Cover
Sep. 22, 2022
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Sep. 22, 2022
Entity File Number 001-38650
Entity Registrant Name Y-MABS THERAPEUTICS, INC.
Entity Central Index Key 0001722964
Entity Tax Identification Number 47-4619612
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 230 Park Avenue
Entity Address, Address Line Two Suite 3350
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10169
City Area Code 646
Local Phone Number 885-8505
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $0.0001 par value
Trading Symbol YMAB
Security Exchange Name NASDAQ
Entity Emerging Growth Company false