0001521036 2021-05-04 2021-05-04 false 0001521036 8-K 2021-09-30 LANTHEUS HOLDINGS, INC. DE 001-36569 35-2318913 331 Treble Cove Road North Billerica MA 01862 978 671-8001 false false false false Common stock, par value $0.01 per share LNTH NASDAQ false