0001060736 2020-07-30 2020-07-30 false SEATTLE GENETICS INC /WA 0001060736 8-K 2020-07-30 DE 0-32405 91-1874389 21823 30th Drive SE Bothell WA 98021 425 527-4000 false false false false Common Stock, par value $0.001 SGEN NASDAQ false