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ORGANIZATION AND DESCRIPTION OF BUSINESS	9 Months Ended
ORGANIZATION AND DESCRIPTION OF BUSINESS	Sep. 30, 2019
ORGANIZATION AND DESCRIPTION OF BUSINESS
ORGANIZATION AND DESCRIPTION OF BUSINESS	NOTE 1—ORGANIZATION AND DESCRIPTION OF BUSINESS Y‑mAbs Therapeutics, Inc. (“we,” “us,” “our,” the “Company,” or “Y‑mAbs”) is a late-stage clinical biopharmaceutical company focused on the development and commercialization of novel antibody-based therapeutic products for the treatment of cancer. We have entered into a worldwide license and research collaboration agreement (the “MSK License Agreement”) with Memorial Sloan‑Kettering Cancer Center (“MSK”), under which we have obtained the exclusive rights to MSK’s rights to two clinical stage antibody‑based product development programs for the treatment of neuroblastoma and other oncology indications. The MSK License Agreement also includes a protein multimerization platform technology, and an option to obtain the rights to certain chimeric antigen receptor T‑cell, or CAR‑T, technologies, as well as rights to certain next‑generation humanized, affinity matured bispecific antibodies. The Company is headquartered in New York, New York and was incorporated on April 30, 2015 under the laws of the State of Delaware.