Document and Entity Information |
6 Months Ended |
|---|---|
Jun. 30, 2016 | |
| Document And Entity Information [Abstract] | |
| Document Type | S-1 |
| Amendment Flag | false |
| Document Period End Date | Jun. 30, 2016 |
| Trading Symbol | RXII |
| Entity Registrant Name | RXi Pharmaceuticals Corp |
| Entity Central Index Key | 0001533040 |
| Entity Filer Category | Smaller Reporting Company |