Document and Entity Information - shares |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
May 31, 2018 |
|
| Document And Entity Information [Abstract] | ||
| Document Type | 10-Q | |
| Amendment Flag | false | |
| Document Period End Date | Mar. 31, 2018 | |
| Document Fiscal Year Focus | 2018 | |
| Document Fiscal Period Focus | Q1 | |
| Trading Symbol | UBX | |
| Entity Registrant Name | Unity Biotechnology, Inc. | |
| Entity Central Index Key | 0001463361 | |
| Current Fiscal Year End Date | --12-31 | |
| Entity Filer Category | Non-accelerated Filer | |
| Entity Common Stock, Shares Outstanding | 42,313,552 |