NP30179: A Multicenter, open-label, phase I study to evaluate the safety, tolerability and pharmacokinetics of escalating doses of RO7082859 as a single agent and in combination with obinutuzumab administered after a fixed, single dose pre-treatment of obinutuzumab ( Gazyva/ Gazyvaro ) in patient with relapsed / refractory B-cell Non Hodgin`s Lymphoma