Ur-Energy Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity and Capital Stock - addl information (Details)

Shareholders' Equity and Capital Stock - addl information (Details)		1 Months Ended		3 Months Ended	12 Months Ended
	Dec. 19, 2013 USD ($) $ / shares shares	Jan. 31, 2016 shares	Jan. 31, 2015 shares	Mar. 31, 2015 shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($) shares	Dec. 31, 2015 CAD / shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 CAD / shares shares	Dec. 31, 2014 $ / shares shares	Dec. 31, 2013 CAD / shares shares	Dec. 31, 2013 $ / shares shares	Dec. 31, 2012 $ / shares shares
Stockholder's Equity Note [Line Items]
Common Stock Shares Issued In Exchange Of Restricted Shares Units		197,374	197,374	215,168	215,168	182,194	338,451
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					608,531	1,623,139	377,927
Proceeds from Stock Options Exercised \| $					$ 410,000	$ 1,347,000	$ 275,000
Stock Issued During Period, Shares, New Issues	4,709,089
Share Price \| (per share)	$ 1.10							CAD 0.89
Payments Of Stock Issuance Costs \| $	$ 200,000					50,000	238,000
Proceeds from Issuance of Private Placement \| $	$ 5,100,000
Stock Issued During Period, Value, New Issues \| $					$ 65	$ (50,000)	$ 3,396,000
Percent or RSUs that vest					286,223	527,407	402,581
Minimum Service For RSU Plan					5 years
Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Percentage					10.00%
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Number									9,974,407	8,468,614	8,468,614	9,273,659	9,273,659	8,511,722
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number									7,484,229
Stock based compensation \| $					$ 893,000	$ 928,000	$ 1,153,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value \| $					$ 600,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					795,592	259,192	273,834
RSUs vested but not redeemed (in shares)										280,529	280,529
RSUs redeemed against tax effect (in shares)			65,361
Class Of Warrant Or Right Issued Number	2,354,545
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares	$ 1.35								$ 1.00		$ 1.20		$ 0.92	$ 0.82
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price \| CAD / shares										CAD 0.96		CAD 1.20
Capital Stock
Stockholder's Equity Note [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					608,531	1,623,139	377,927
Stock Issued During Period, Shares, New Issues							4,709,089
Stock Issued During Period, Value, New Issues \| $						$ (50,000)	$ 3,396,000
Number of securities called by each unit									1
Warrants
Stockholder's Equity Note [Line Items]
Number of securities called by each unit									0.5
In Money Stock Option [Member]
Stockholder's Equity Note [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Number									3,968,617
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number									2,021,028
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options \| $									$ 700,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition					1 year 2 months 12 days
Restricted Stock Units (RSUs) [Member]
Stockholder's Equity Note [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options \| $									$ 600,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition					1 year 6 months
RSUs vested but not redeemed (in shares)									212,803
RSUs redeemed against tax effect (in shares)		15,429
Restricted Stock Units (RSUs) [Member] \| Capital Stock
Stockholder's Equity Note [Line Items]
Number of securities called by each unit									1
Employee Stock Option [Member]
Stockholder's Equity Note [Line Items]
Proceeds from Stock Options Exercised \| $							$ 300,000
Four and One Half Months After Grant [Member]
Stockholder's Equity Note [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Percentage					22.00%
Nine Months After Grant [Member]
Stockholder's Equity Note [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Percentage					22.00%
Thirteen and One Half Months After Grant [Member]
Stockholder's Equity Note [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Percentage					22.00%
Eighteen Months After Date Of Grant [Member]
Stockholder's Equity Note [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Percentage					24.00%
First Anniversary [Member]
Stockholder's Equity Note [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Restricted Share Units Vesting Percentage					50.00%
Second Anniversary [Member]
Stockholder's Equity Note [Line Items]
Percent or RSUs that vest					100
Share-Based Compensation Arrangement By Share-Based Payment Award, Restricted Share Units Vesting Percentage					50.00%
Maximum \| Restricted Stock Units (RSUs) [Member]
Stockholder's Equity Note [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price \| CAD / shares								1.22
Minimum \| Restricted Stock Units (RSUs) [Member]
Stockholder's Equity Note [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price \| CAD / shares								CAD 0.80