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) $ in Thousands	3 Months Ended
Sales (Details) $ in Thousands	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)
Sales
Revenue, Net, Total	$ 14,828	$ 2,714
Disposal fee income	9	5
Sales Revenue, Goods, Net [Member]
Sales
Sales Revenue, Goods, Net	3,141	2,709
Sale Of Purchased Inventory [Member]
Sales
Sales Revenue, Goods, Net	11,678
Company A [Member] \| Sales Revenue, Goods, Net [Member]
Sales
Sales Revenue, Goods, Net	3,141
Company A [Member] \| Sale Of Purchased Inventory [Member]
Sales
Sales Revenue, Goods, Net	3,141
Company B [Member] \| Sales Revenue, Goods, Net [Member]
Sales
Sales Revenue, Goods, Net		1,725
Company C [Member] \| Sales Revenue, Goods, Net [Member]
Sales
Sales Revenue, Goods, Net		984
Company D [Member] \| Sale Of Purchased Inventory [Member]
Sales
Sales Revenue, Goods, Net	8,537
Company A, B, C, D [Member]
Sales
Sales Revenue, Goods, Net	$ 14,819	$ 2,709
Customer Concentration Risk [Member]
Sales
Concentration Risk, Percentage	100.00%	100.00%
Disposal Fee Income Concentration Risk Percentage	0.1	0.2
Customer Concentration Risk [Member] \| Sales Revenue, Goods, Net [Member]
Sales
Concentration Risk, Percentage	21.20%	99.80%
Customer Concentration Risk [Member] \| Sale Of Purchased Inventory [Member]
Sales
Concentration Risk, Percentage	78.80%	0.00%
Customer Concentration Risk [Member] \| Company A [Member] \| Sales Revenue, Goods, Net [Member]
Sales
Concentration Risk, Percentage	21.20%	0.00%
Customer Concentration Risk [Member] \| Company A [Member] \| Sale Of Purchased Inventory [Member]
Sales
Concentration Risk, Percentage	21.20%	0.00%
Customer Concentration Risk [Member] \| Company B [Member] \| Sales Revenue, Goods, Net [Member]
Sales
Concentration Risk, Percentage	0.00%	63.50%
Customer Concentration Risk [Member] \| Company C [Member] \| Sales Revenue, Goods, Net [Member]
Sales
Concentration Risk, Percentage	0.00%	36.30%
Customer Concentration Risk [Member] \| Company D [Member] \| Sale Of Purchased Inventory [Member]
Sales
Concentration Risk, Percentage	57.60%	0.00%
Customer Concentration Risk [Member] \| Company A, B, C, D [Member]
Sales
Concentration Risk, Percentage	99.90%	99.80%