Patients may not have a known or confirmed history of pneumonitis Patients must not have a history of immune-mediated pneumonitis or colitis that required interruption of therapy or treatment of steroids Prior history of hypersensitivity, drug or radiation-induced, or other immune-mediated pneumonitis Evidence of current pneumonitis Participants with evidence of pneumonitis on scans at screening will be excluded Patients excluded with any prior treatment of pneumonitis requiring corticosteroids. History of immune-mediated pneumonitis Pneumonitis and history of pneumonitis. History of pneumonitis History and/or confirmed pneumonitis Patient is confirmed to have actively symptomatic pneumonitis Patients with a history of pneumonitis History of pneumonitis History of pneumonitis within the last years History of pneumonitis within the last years History of pneumonitis Prior history of radiation pneumonitis History of pneumonitis requiring hospitalization or systemic immune suppressive therapy History of pneumonitis or active lung infection History of pneumonitis A history of drug-induced pneumonitis or hypersensitivity pneumonitis from prior ALK TKI therapy Pneumonitis within the last years History of or ongoing drug-induced pneumonitis Patients with active pneumonitis TREATMENT SCREENING: Active pneumonitis Active or prior history of pneumonitis that required corticosteroids Patients with active sepsis or pneumonitis Known history or ongoing diagnosis of pneumonitis Patient has documented pneumonitis which is active and requiring treatment History of acute pneumonitis. Presence of active pneumonitis Pneumonitis that requires oral or IV steroids; Current pneumonitis or history of pneumonitis requiring steroids Ongoing drug-induced pneumonitis Subjects with pneumonitis or at risk of pneumonitis; History of drug-induced pneumonitis Ongoing drug-induced pneumonitis would be exclusion for idelalisib therapy but ibrutinib would be an option Ongoing drug-induced pneumonitis History of pneumonitis attributed to an EGFR inhibitor; history of radiation pneumonitis is allowed provided steroid administration for pneumonitis was not required Ongoing active pneumonitis Ongoing drug-induced pneumonitis History of pneumonitis within the last years Diagnosis of diffuse radiation pneumonitis History of immune-mediated pneumonitis History of pneumonitis History of pneumonitis requiring hospitalization or systemic immune suppressive therapy