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
Sales (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Sales
Revenue, Net, Total	$ 19,672	$ 14,828
Disposal fee income	9	9
Sales Revenue, Goods, Net [Member]
Sales
Sales Revenue, Goods, Net	237	3,141
Sale Of Purchased Inventory [Member]
Sales
Sales Revenue, Goods, Net	19,426	11,678
Company B [Member]
Sales
Sales Revenue, Goods, Net		3,141
Company B [Member] \| Sale Of Purchased Inventory [Member]
Sales
Sales Revenue, Goods, Net	3,790	3,141
Company C [Member] \| Sale Of Purchased Inventory [Member]
Sales
Sales Revenue, Goods, Net	15,636	8,537
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	$ 19,663	$ 14,819
Customer Concentration Risk [Member]
Sales
Concentration Risk, Percentage	100.00%	100.00%
Disposal Fees Concentration Risk Percentage	0.00%	0.00%
Customer Concentration Risk [Member] \| Sales Revenue, Goods, Net [Member]
Sales
Concentration Risk, Percentage	1.20%	21.20%
Customer Concentration Risk [Member] \| Sale Of Purchased Inventory [Member]
Sales
Concentration Risk, Percentage	98.80%	78.80%
Customer Concentration Risk [Member] \| Company B [Member]
Sales
Concentration Risk, Percentage	0.00%	21.20%
Customer Concentration Risk [Member] \| Company B [Member] \| Sale Of Purchased Inventory [Member]
Sales
Concentration Risk, Percentage	19.30%	21.20%
Customer Concentration Risk [Member] \| Company C [Member] \| Sale Of Purchased Inventory [Member]
Sales
Concentration Risk, Percentage	79.50%	57.60%
Customer Concentration Risk [Member] \| Company E [Member] \| Sales Revenue, Goods, Net [Member]
Sales
Concentration Risk, Percentage	1.20%	0.00%
Customer Concentration Risk [Member] \| Company A, B, C, D [Member]
Sales
Concentration Risk, Percentage	100.00%	100.00%