This study is for patients who have been diagnosed with multiple myeloma. The investigational drug in this study is idecabtagene vicleucel (ide-cel). The purpose of this study is to provide the investigational drug as a possible cancer treatment that would otherwise be unavailable. Patients can expect to have about 8 clinic visits and to be in this study for up to 3 months after receiving the study drug and in follow up for up to 15 years.