Annual report pursuant to Section 13 and 15(d)


Cover - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Feb. 24, 2021
Jun. 30, 2020
Cover [Abstract]      
Entity Registrant Name UR-ENERGY INC.    
Entity Central Index Key 0001375205    
Document Type 10-K    
Amendment Flag false    
Entity Voluntary Filers No    
Current Fiscal Year End Date --12-31    
Entity Well Known Seasoned Issuer No    
Entity Small Business true    
Entity Shell Company false    
Entity Emerging Growth Company false    
Entity Current Reporting Status Yes    
Document Period End Date Dec. 31, 2020    
Entity Filer Category Non-accelerated Filer    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2020    
Entity Common Stock Shares Outstanding   188,871,300  
Entity Public Float     $ 93.1
Document Annual Report true    
Document Transition Report false    
Entity File Number 001-33905    
Entity Incorporation State Country Code Z4    
Entity Tax Identification Number 00-0000000    
Entity Address Address Line 1 10758 West Centennial Road    
Entity Address Address Line 2 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    
Security 12b Title Common Shares    
Trading Symbol URG    
Security Exchange Name NYSE    
Entity Interactive Data Current Yes