A Study of Zanubrutinib Plus Anti-CD20 Versus Lenalidomide Plus Rituximab in Participants With Relapsed/Refractory Follicular or Marginal Zone Lymphoma

Key Inclusion Criteria: * Histologically confirmed grade 1-3a FL or MZL * Previously treated with ≥ 1 line of systemic therapy including anti-CD20 agent. Must have a documented failure to achieve at least partial response during the most recent systemic therapy or documented progressive disease after the most recent systemic therapy * Need for systemic therapy for FL or MZL * Measurable disease by computed tomography or magnetic resonance imaging * Adequate bone marrow, liver and renal function Key Exclusion Criteria: * Transformation to aggressive lymphoma * Requiring ongoing need for corticosteroid treatment * Clinically significant cardiovascular disease * Prior malignancy within the past 2 years * Active fungal, bacterial, and/or viral infection that requires systemic therapy * Prior treatment with lenalidomide or drug from same class, if without response (partial or complete) or short remission duration (\< 24 months) Note: Other protocol defined Inclusion/Exclusion criteria may apply.