Key Inclusion Criteria:  Males or females aged 18 to 45 years of age with a BMI >18.0 and <32.0 kg/m2 and body weight greater than or equal to 50kg for males and greater than or equal to 45 kg for females. Casual smoker (defined by the consumption of no more than 5 cigarettes per week, and willing to abstain from the consumption of cigarettes and related products for the study duration) or non smoker. Agree to use appropriate contraception.  Key Exclusion Criteria:  Any clinically significant abnormality at physical examination, clinically significant abnormal laboratory test results (liver function tests must be strictly within normal ranges) or positive test for HIV, hepatitis B, or hepatitis C found during medical screening. Positive urine drug screen or alcohol breath test at screening and check-in (Day -1). Positive pregnancy test, or breast feeding. Clinically significant 12-lead ECG abnormalities. Any reason which, in the opinion of the Investigator, would prevent the subject from participating in the study.