Ur-Energy Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Sales (Details)

Sales (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Sales (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Sales
Revenue, Net, Total	$ 3,807	$ 11,821	$ 23,479	$ 26,649
Disposal fee income			26	33
Sales Revenue, Goods, Net [Member]
Sales
Sales Revenue, Goods, Net			237	4,918
Sale Of Purchased Inventory [Member]
Sales
Sales Revenue, Goods, Net			23,216	21,698
Company B [Member]
Sales
Sales Revenue, Goods, Net				3,141
Company B [Member] \| Sale Of Purchased Inventory [Member]
Sales
Sales Revenue, Goods, Net			7,580	6,358
Company C [Member]
Sales
Sales Revenue, Goods, Net				1,777
Company C [Member] \| Sale Of Purchased Inventory [Member]
Sales
Sales Revenue, Goods, Net			15,636	15,340
Company E [Member] \| Sales Revenue, Goods, Net [Member]
Sales
Sales Revenue, Goods, Net			237
Company A, B, C, D [Member]
Sales
Sales Revenue, Goods, Net			$ 23,453	$ 26,616
Customer Concentration Risk [Member]
Sales
Concentration Risk, Percentage			100.00%	100.00%
Disposal Fees Concentration Risk Percentage			0.10%	0.10%
Customer Concentration Risk [Member] \| Sales Revenue, Goods, Net [Member]
Sales
Concentration Risk, Percentage			1.00%	18.50%
Customer Concentration Risk [Member] \| Sale Of Purchased Inventory [Member]
Sales
Concentration Risk, Percentage			98.90%	81.40%
Customer Concentration Risk [Member] \| Company B [Member]
Sales
Concentration Risk, Percentage			0.00%	11.80%
Customer Concentration Risk [Member] \| Company B [Member] \| Sale Of Purchased Inventory [Member]
Sales
Concentration Risk, Percentage			32.30%	23.80%
Customer Concentration Risk [Member] \| Company C [Member]
Sales
Concentration Risk, Percentage			0.00%	6.70%
Customer Concentration Risk [Member] \| Company C [Member] \| Sale Of Purchased Inventory [Member]
Sales
Concentration Risk, Percentage			66.60%	57.60%
Customer Concentration Risk [Member] \| Company E [Member] \| Sales Revenue, Goods, Net [Member]
Sales
Concentration Risk, Percentage			1.00%	0.00%
Customer Concentration Risk [Member] \| Company A, B, C, D [Member]
Sales
Concentration Risk, Percentage			99.90%	99.90%