| Document and Entity Information | Oct. 21, 2020 |
| Document and Entity Information [Abstract] | |
| Entity Central Index Key | 0001375205 |
| Amendment Flag | false |
| Document Type | 8-K |
| Document Period End Date | Oct. 21, 2020 |
| Entity Registrant Name | UR-ENERGY INC. |
| Entity Incorporation, State or Country Code | Z4 |
| Entity File Number | 001-33905 |
| Entity Address, Address Line One | 10758 W Centennial Road |
| Entity Address, Address Line Two | Suite 200 |
| Entity Address, City or Town | Littleton |
| Entity Address, State or Province | CO |
| Entity Address, Postal Zip Code | 80127 |
| City Area Code | 720 |
| Local Phone Number | 981-4588 |
| Title of 12(b) Security | Common stock |
| Trading Symbol | URG |
| Security Exchange Name | NYSE |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
