0000949858 dei:OtherAddressMember 2026-10-01 2026-10-01 0000949858 2026-10-01 2026-10-01 false 0000949858 8-K 2026-10-01 ACHIEVE LIFE SCIENCES, INC. DE 033-80623 95-4343413 22722 29th Drive SE Suite 100 Bothell WA 98021 1040 West Georgia Suite 1030 Vancouver BC CA V6E 4H1 604 210-2217 false false false false Common Stock, par value $0.001 per share ACHV NASDAQ false