| Cover | Dec. 10, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Dec. 10, 2020 |
| Entity Registrant Name | Concert Pharmaceuticals, Inc. |
| Entity Incorporation, State | DE |
| Entity File Number | 001-36310 |
| Entity Tax Identification Number | 20-4839882 |
| Entity Address, Street | 65 Hayden Avenue |
| Entity Address, Suite | Suite 3000N |
| Entity Address, City | Lexington |
| Entity Address, State | MA |
| Entity Address, Postal Zip Code | 02421 |
| City Area Code | 781 |
| Local Phone Number | 860-0045 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of each class | Common stock, $0.001 par value per share |
| Trading symbol(s) | CNCE |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001367920 |
| Amendment Flag | false |
| Current Fiscal Year End Date | --12-31 |
