The purpose of this study is to evaluate the pharmacokinetics (PK) and safety and tolerability of single-dose administration of IDX719 in participants with normal hepatic function and participants with varying degrees of hepatic impairment.

Inclusion Criteria:

• Read and sign the written informed consent form (ICF) after the nature of the study has been fully explained.
• All subjects of childbearing potential must have agreed to use a double method of birth control (one of which must be a barrier) from Screening through at least 90 days after the last dose of the study drug.
• Male subjects have agreed not to donate sperm from Day -1 through 90 days after the last dose of study drug.

Exclusion Criteria:

• Pregnant or breastfeeding.
• Other clinically significant medical conditions or laboratory abnormalities