Key Inclusion Criteria:

          1. ≥ 70 years of age at the time of informed consent, OR 65-69 years of age with
             comorbidities precluding autologous stem cell transplantation

          2. Histologically confirmed diagnosis of MCL

          3. No prior systemic treatments for MCL

          4. Measurable disease by CT/MRI

          5. Eastern Cooperative Oncology Group (ECOG) performance status of 0-2

          6. Adequate marrow and organ function

        Key Exclusion Criteria:

          1. Known central nervous system involvement by lymphoma

          2. Participants for whom the goal of therapy is tumor debulking prior to stem cell
             transplant

          3. Clinically significant cardiovascular disease

          4. History of severe bleeding disorder

          5. Unable to swallow capsules or disease significantly affecting gastrointestinal
             function

          6. Active fungal, bacterial and/or viral infection requiring systemic therapy

          7. Requires ongoing treatment with a strong CYP3A inhibitor or inducer

        NOTE: Other protocol defined Inclusion/Exclusion criteria may apply.