Open-Label Hepatic Impairment Study

Inclusion Criteria: * Hepatic impaired Males or females of non-childbearing potential aged \> 18 years with Chronic HCV-infection * Naïve to all direct acting anti-viral (DAA) treatments for chronic HCV infection. * Documented Cirrhosis Exclusion Criteria: * Prior PEG/RBV null responders. * Unstable cardiac disease, recent Myocardial infarction, or family history of QTc prolongation or unexplained cardiac arrest. * Positive test at Screening for anti-HAV IgM Ab, HBsAg, anti-HBc IgM Ab, or anti-human immunodeficiency virus (HIV) Ab. * History of clinically significant medical condition associated with other chronic liver disease * Any current signs or symptoms of severe hepatic encephalopathy * History of gastric or esophageal variceal bleeding in which varices have not been adequately treated with medication and surgical procedures * Prior placement of a portosystemic shunt * History of hepatorenal, or hepatopulmonary syndrome. * Active spontaneous bacterial peritonitis. * Use of medications associated with QT prolongation within 28 days prior to dosing. * Current Hypotension * History of Torsades de Pointes, evidence of an active or suspected cancer, or a history of malignancy, Abnormal hematological and biochemical parameters