 - A Dose Escalation Stage: Confirmed diagnosis of relapsed or refractory Non-Hodgkin Lymphoma NHL treated with prior treatment for lymphoid malignancy comprising of at least 1 regimen containing a therapeutic anti-CD20 antibody eg, rituximab, ofatumumab, GA-101 and at least 2 prior combination chemotherapy regimens or autologous stem cell transplant , or treated with 1 prior combination chemotherapy regimen in patients without an approved second-line therapy option, requiring treatment in the opinion of the treating physician 