Part I of the study is a double-blind, randomized, placebo-controlled assessment of single-ascending doses (SAD) of CORT118335. Subjects will be enrolled sequentially into 1 of up 7 cohorts (Cohorts A to G), each containing 8 subjects. Within each cohort, 6 subjects will be randomly assigned to receive a single dose of CORT118335 and 2 subjects will be randomly assigned to receive a single dose of matching placebo.