I. To compare the complete response rate at 6 cycles after randomization as defined by centrally read positron emission tomography (PET)/computed tomography (CT) (integral biomarker) of 2 targeted therapeutic regimens (obinutuzumab + PI3K-delta inhibitor TGR-1202 [TGR-1202] or obinutuzumab + lenalidomide) with obinutuzumab + cyclophosphamide, doxorubicin hydrochloride, vincristine sulfate, and prednisone (CHOP) in patients with early relapsing or refractory follicular lymphoma.