0001643615 us-gaap:CommonStockMember 2026-10-07 2026-10-07 0001643615 2026-10-07 2026-10-07 0001643615 ont:PreferredStockPurchaseRightsMember 2026-10-07 2026-10-07 false 0001643615 8-K 2026-10-07 Onterris, Inc. DE 001-39394 46-4195044 5120 Northshore Drive North Little Rock AR 72118 501 900-6400 false false false false Common Stock, $0.000004 par value per share ONT NYSE Preferred Stock Purchase Rights true NYSE false