Key Inclusion Criteria:

* Up to 5 prior regimens for MCL. Prior therapy must have included anthracycline- or bendamustine-containing chemotherapy and anti-CD20 monoclonal antibody therapy. Individuals must not have received prior therapy with a BTKi.
* At least 1 measurable lesion
* Platelet count ≥ 75,000/uL
* Creatinine clearance (as estimated by Cockcroft Gault) ≥ to 60 cc/min
* Cardiac ejection fraction ≥ 50%, no evidence of pericardial effusion as determined by an echocardiogram (ECHO) or multigated acquisition (MUGA), and no clinically significant electrocardiogram (ECG) findings
* Baseline oxygen saturation \> 92% on room air

Key Exclusion Criteria:

* Known history of infection with human immunodeficiency virus (HIV) or hepatitis B (HBsAG positive) or hepatitis C virus (anti-HCV positive). Individuals with a history of hepatitis infection must have cleared their infection as determined by standard serological and genetic testing
* History of a seizure disorder, cerebrovascular ischemia/hemorrhage, dementia, cerebellar disease, cerebral edema, posterior reversible encephalopathy syndrome, or any autoimmune disease with central nervous system (CNS) involvement
* Presence of fungal, bacterial, viral, or other infection that is uncontrolled or requiring IV antimicrobials for management

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