Ur-Energy (URG) 10-K 2 Mar 15 2014 FY Annual report Financial data

Document_And_Entity_Informatio

Document And Entity Information (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Mar. 02, 2015	Jun. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Entity Current Reporting Status	Yes
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Common Stock, Shares Outstanding		129,733,052
Entity Public Float			$118.60
Entity Registrant Name	UR-ENERGY INC
Entity Central Index Key	1375205
Current Fiscal Year End Date	-19
Entity Filer Category	Accelerated Filer

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets
Cash and cash equivalents (note 4)	$3,104	$1,627
Accounts receivable (note 5)	28	5,802
Inventory (note 6)	5,168	2,053
Current deferred financing costs (note 12)	190	183
Prepaid expenses	856	767
Assets, Current, Total	9,346	10,432
Restricted cash (note 7)	7,556	5,055
Mineral properties (note 8)	52,750	52,702
Capital assets (note 9)	32,993	35,250
Equity investment (note 10)	1,090	1,085
Deferred financing costs (note 12)	716	812
Assets, Noncurrent, Total	95,105	94,904
Assets, Total	104,451	105,336
Current liabilities
Accounts payable and accrued liabilities (note 11)	4,532	2,928
Current portion of notes payable (note 12)	7,374	5,153
Deferred revenue (note 13)		2,508
Reclamation obligations	85	85
Liabilities, Current, Total	11,991	10,674
Notes payable (note 12)	33,193	34,000
Deferred income tax liability (note 14)	3,345	3,345
Asset retirement obligations (note 15)	23,445	17,279
Other liabilities - warrants (note 16)	376	1,374
Liabilities, Noncurrent, Total	60,359	55,998
Liabilities	72,350	66,672
Commitments (note 19)
Share Capital
Common shares, without par value, unlimited shares authorized; shares issued and outstanding: 129,365,076 at December 31, 2014 and 127,559,743 at December 31, 2013	168,118	165,974
Warrants	4,175	4,175
Contributed surplus	14,250	14,247
Accumulated other comprehensive income	3,337	3,298
Deficit	-157,779	-149,030
Stockholders'Equity Attributable to Parent, Total	32,101	38,664
Liabilities and Equity, Total	$104,451	$105,336

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]
Class A preferred shares, without par value	$0	$0
Class A preferred shares, shares issued	0	0
Class A preferred shares, shares outstanding	0	0
Common shares, without par value	$0	$0
Common shares, Shares issued	129,365,076	127,559,743
Common shares, Shares outstanding	129,365,076	127,559,743

Consolidated_Statements_of_Ope

Consolidated Statements of Operations and Comprehensive Loss (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Sales (note 18)	$29,349	$7,616
Cost of sales	-17,858	-3,096
Gross profit	11,491	4,520
Operating Expenses
Exploration and evaluation	-3,277	-2,385	-3,285
Development	-7,672	-18,465	-8,979
General and administrative	-6,541	-5,592	-6,107
Accretion	-497	-27
Write off of mineral property (note 8)	-483	-1,430
Loss from operations	-6,979	-23,379	-18,371
Interest income (expense) (net)	-2,699	-6,111	307
Warrants mark to market adjustment (note 16)	946
Loss on equity investment (note 10)	-5	-1,022	-64
Foreign exchange gain (loss)	-12	164	-385
Other loss		-5	955
Net loss for the period	-8,749	-30,353	-17,558
Loss per common share:
Basic and diluted	($0.07)	($0.25)	($0.15)
Weighted average number of common shares outstanding:
Basic and diluted	128,781,215	122,231,993	118,521,509
COMPREHENSIVE LOSS
Net Loss	-8,749	-30,353	-17,558
Adjustment to beginning balances due to change in functional currency		-6,161
Translation adjustment on foreign operations	39	-210	1,445
Comprehensive loss for the year	($8,710)	($36,724)	($16,113)

Consolidated_Statements_of_Sha

Consolidated Statements of Shareholders' Equity (USD $)	Capital Stock	Warrants	Contributed Surplus	Accumulated Other Comprehensive Income	Deficit	Total
In Thousands, except Share data
Beginning Balance at Dec. 31, 2011	$144,156	$43	$11,685	$8,224	($101,119)	$62,989
Beginning Balance (in shares) at Dec. 31, 2011	103,675,444
Exercise of stock options	117		-41			76
Exercise of stock options (in shares)	88,473					88,473
Common shares issued for cash, net of issue costs - additional costs	16,275					16,275
Common shares issued for cash, net of issue costs - additional costs (in shares)	17,250,000
Redemption of vested RSUs	348		-366			-18
Redemption of vested RSUs (in shares)	120,359
Issuance of warrants		18				18
Non-cash stock compensation			2,410			2,410
Net loss and comprehensive loss				1,445	-17,558	-16,113
Ending Balance at Dec. 31, 2012	160,896	61	13,688	9,669	-118,677	65,637
Ending Balance (in shares) at Dec. 31, 2012	121,134,276
Exercise of stock options	420		-145			275
Exercise of stock options (in shares)	377,927					377,927
Common shares issued for cash, net of issue costs - additional costs	3,396					3,396
Common shares issued for cash, net of issue costs - additional costs (in shares)	4,709,089
Adjustment to beginning balances due to change in functional currency				-6,161		-6,161
Redemption of vested RSUs	499		-563			-64
Redemption of vested RSUs (in shares)	338,451
Issuance of warrants		4,228				4,228
Cancellation of warrants		-114	114
Common shares issued for royalty interest	763					763
Common shares issued for royalty interest (in shares)	1,000,000
Non-cash stock compensation			1,153			1,153
Ending Balance at Dec. 31, 2013	165,974	4,175	14,247	3,298	-149,030	38,664
Ending Balance (in shares) at Dec. 31, 2013	127,559,743
Exercise of stock options	2,052		-705			1,347
Exercise of stock options (in shares)	1,623,139					1,623,139
Common shares issued for cash, net of issue costs - additional costs	-50					-50
Redemption of vested RSUs	142		-225			-83
Redemption of vested RSUs (in shares)	182,194
Other capital contributions			5			5
Non-cash stock compensation			928			928
Net loss and comprehensive loss				39	-8,749	-8,710
Ending Balance at Dec. 31, 2014	$168,118	$4,175	$14,250	$3,337	($157,779)	$32,101
Ending Balance (in shares) at Dec. 31, 2014	129,365,076

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flow (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash provided by (used in) Operating activities
Net loss for the period	($8,749)	($30,353)	($17,558)
Items not affecting cash:
Stock based expense	928	1,153	2,410
Depreciation and amortization	7,643	537	530
Non-cash interest expense		3,881
Accretion Expense	497	27
Provision for reclamation		9	-97
Write-off of investments		1,006
Write-off of mineral properties	483	1,430
Warrants mark to market gain	-946
Foreign exchange loss (gain)		-156	383
Loss (gain) on disposition of assets		1	-968
Other loss	3	18	68
Gain from fulfillment of assigned sales contract	-2,508
RSUs redeemed for cash	-66	-64	-19
Proceeds from assignment of sales contract		2,508
Change in non-cash working capital items:
Accounts receivable	5,772	-5,720	-1
Inventory	-3,115	-1,433
Prepaid expenses	259	-1,414	-85
Accounts payable and accrued liabilities	1,736	800	615
Net Cash Provided by (Used in) Operating Activities, Total	1,937	-27,770	-14,722
Investing activities
Mineral property costs	-65	-5,319	-320
Purchase of short-term investments			-10,195
Sale of short-term investments		6,593	10,631
Increase in restricted cash	-2,500	-3,001	2,198
Deposit for Pathfinder acquisition			-1,338
Funding of equity investment	-7	-9	-27
Purchase of capital assets	-436	-23,990	-6,958
Net Cash Provided by (Used in) Investing Activities, Total	-3,008	-25,726	-6,009
Financing activities
Issuance of common shares and warrants for cash		5,482	17,210
Share issue costs	-50	-238	-1,003
Proceeds from exercise of stock options	1,347	275	75
Proceeds from debt financing	5,000	75,100
Cost of debt financing	-135	-403
Repayment of debt	-3,585	-36,425	-28
Net Cash Provided by (Used in) Financing Activities, Total	2,577	43,791	16,254
Effects of foreign exchange rate changes on cash	-29	-204	159
Net change in cash and cash equivalents	1,477	-9,909	-4,318
Beginning cash and cash equivalents	1,627	11,536	15,854
Ending cash and cash equivalents	3,104	1,627	11,536
Non-cash financing and investing activities:
Interest Paid	$2,526	$1,056	$3

Nature_of_operations

Nature of operations	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation Of Financial Statements [Abstract]
Nature of operations	1.Nature of Operations
	Ur-Energy Inc. (the “Company”) was incorporated on March 22, 2004 under the laws of the Province of Ontario. The Company continued under the Canada Business Corporations Act on August 8, 2006. The Company is an exploration stage mining company, as defined by United States Securities and Exchange Commission (“SEC”) Industry Guide 7, headquartered in Littleton, Colorado.  The Company is engaged in uranium mining and recovery operations, with activities including the acquisition, exploration, development and production of uranium mineral resources located primarily in Wyoming. As of August 2013, the Company commenced uranium production at its Lost Creek Project in Wyoming.
	Due to the nature of the uranium mining methods used by the Company on the Lost Creek Property, and the definition of “mineral reserves” under National Instrument 43-101 (“NI 43-101”), which uses the Canadian Institute of Mining, Metallurgy and Petroleum (“CIM”) Definition Standards, the Company has not determined whether the properties contain mineral reserves. However, the Company’s December 30, 2013 NI 43-101 Technical Report on Lost Creek, “Preliminary Economic Assessment of the Lost Creek Property, Sweetwater County, Wyoming,” outlines the potential viability of the Lost Creek Property. The recoverability of amounts recorded for mineral properties is dependent upon the discovery of economic resources, the ability of the Company to obtain the necessary financing to develop the properties and upon attaining future profitable production from the properties or sufficient proceeds from disposition of the properties.

Liquidity_Risk

Liquidity Risk	12 Months Ended
	Dec. 31, 2014
Liquidity Risk [Abstract]
Liquidity Risk	2.Liquidity Risk
	The Company has financed its operations from its inception primarily through the issuance of equity securities and debt instruments.  Construction and development of the Lost Creek Project commenced in October 2012 after receiving the Record of Decision from the United States Department of the Interior Bureau of Land Management (“BLM”).  Production began in August 2013 after receiving final operational clearance from the United States Nuclear Regulatory Commission (“NRC”). The Company made its first deliveries and related sales in December 2013.  It is now generating cash flows from operations to finance its ongoing operations.
	Based upon the Company’s current working capital balance and the expected timing of product sales, the Company expects to be able to meet current obligations without the need for additional financing but it is possible that additional funding might be sought. Although the Company has been successful in raising debt and equity financing in the past, there can be no guarantee that such funding will be available in the future.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	3.Summary of Significant Accounting Policies
	Basis of presentation
	These financial statements have been prepared by management in accordance with United States generally accepted accounting principles (“US GAAP”) and include all of the assets, liabilities and expenses of the Company and its wholly-owned subsidiaries Ur-Energy USA Inc.; NFU Wyoming, LLC; Lost Creek ISR, LLC; NFUR Bootheel, LLC; Hauber Project LLC; NFUR Hauber, LLC; and Pathfinder Mines Corporation. All inter-company balances and transactions have been eliminated upon consolidation. Ur-Energy Inc. and its wholly-owned subsidiaries are collectively referred to herein as the “Company.”
	Functional currency and presentation currency
	The Company changed its functional currency prospectively, beginning January 1, 2013, from the Canadian dollar to the U.S. dollar with respect to its operations in the United States. The change in functional currency had a significant impact on the Company’s consolidated financial statements as most of the non-current assets of the Company are situated in the United States and were previously accounted for using the Canadian dollar as the functional currency.  As of January 1, 2013, the Company recorded a cumulative transaction adjustment (“CTA”) of approximately $6.2 million for this change, which is shown in the consolidated statement of shareholders’ equity.
	The functional currency for Canadian operations will remain the Canadian dollar.  They will be consolidated with the U.S. cost basis balances using the spot rate for assets and liabilities, the historical cost rates for shareholders’ equity transactions and the average rate for all operating revenues and expenses.  Additional translation adjustments will result from the change in consolidation methods as prescribed by US GAAP where there are multiple functional currencies reflected in consolidated financial statements.  These adjustments will not be included in determining net income, but will be reported separately and accumulated in other comprehensive income.
	In addition, as a result of losing its foreign private issuer status, the Company changed its presentational currency from the Canadian dollar to U.S. dollars. As a result, comparative information has been changed.
	Exploration Stage
	The Company has established the existence of mineral resources for certain uranium projects, including the Lost Creek property The Company has not established proven or probable reserves, as defined by the SEC under Industry Guide 7, through the completion of a “final” or “bankable” feasibility study for any of its uranium projects, including Lost Creek property. Furthermore, the Company has no plans to establish proven or probable reserves for any of its uranium projects for which the Company plans on utilizing in situ recovery (“ISR”) mining, such as the Lost Creek property or the Shirley Basin mine. As a result, and despite the fact that the Company commenced extraction of U3O8 at the Lost Creek property in August 2013, the Company remains in the Exploration Stage as defined under Industry Guide 7, and will continue to remain in the Exploration Stage until such time proven or probable reserves have been established.
	Since the Company commenced extraction of uranium resources at the Lost Creek property without having established proven and probable reserves, any mineral resources established or extracted from the Lost Creek property should not be in any way associated with having established or produced from proven or probable reserves.
	In accordance with US GAAP, expenditures relating to the acquisition of mineral rights are initially capitalized as incurred while exploration and pre-extraction expenditures are expensed as incurred until such time the Company exits the Exploration Stage by establishing proven or probable reserves. Expenditures relating to exploration activities such as drill programs to search for additional mineral resources are expensed as incurred. Expenditures relating to activities such as the construction of mine wellfields, header houses and disposal wells are expensed as incurred until such time proven or probable reserves are established for that uranium project, after which subsequent expenditures relating to mine development activities for that particular project are capitalized as incurred
	Companies in the Production Stage as defined under Industry Guide 7, having established proven and probable reserves and exited the Exploration Stage, typically capitalize expenditures relating to ongoing development activities, with corresponding depletion calculated over proven and probable reserves using the units-of-production method and allocated to future reporting periods to inventory and, as that inventory is sold, to cost of goods sold. The Company is in the Exploration Stage which has resulted in the Company reporting larger losses than if it had been in the Production Stage due to the expensing, instead of capitalizing, of expenditures relating to ongoing wellfield development activities. Additionally, there would be no corresponding amortization allocated to future reporting periods of the Company since those costs would have been expensed previously, resulting in both lower inventory costs and cost of goods sold and results of operations with higher gross profits and lower losses than if the Company had been in the Production Stage. Any capitalized costs, such as expenditures relating to the acquisition of mineral rights and asset retirement obligations, are amortized over the estimated mineral life using the straight-line method. As a result, the Company’s consolidated financial statements may not be directly comparable to the financial statements of companies in the Production Stage.
	Use of estimates
	The preparation of consolidated financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. The most significant estimates management makes in the preparation of these consolidated financial statements relate to potential impairment in the carrying value of the Company’s long-lived assets, fair value of stock-based compensation, valuation of the in-process inventory and estimation of asset retirement obligations. Actual results could differ from those estimates.
	Restricted cash
	Cash which is restricted contractually or which secures various instruments including surety bonds and letters of credit securing reclamation obligations is shown as restricted cash
	Inventory
	In-process inventory represents U3O8 that has been extracted from the wellfield and captured in the processing plant and is currently being transformed into a saleable product. Plant inventory is U3O8 that is contained in yellowcake, which has been dried and packaged in drums, but not yet shipped to the conversion facility. The amount of U3O8 in the plant inventory is determined by weighing and assaying the amount of U3O8 packaged into drums at the plant. Conversion facility inventory is U3O8 that has been shipped to the conversion facility. The amount of U3O8 in the conversion facility inventory includes the amount of U3O8 contained in drums shipped to the conversion facility plus or minus any final weighing and assay adjustments per the terms of the uranium supplier’s agreement with the conversion facility.
	The Company’s inventories are measured at the lower of cost or net realizable value and reflect the uranium content (“U3O8”) in various stages of the production and sales process including in-process inventory, plant inventory and conversion facility inventory. Operating supplies are expensed when purchased.
	Mineral properties
	Acquisition costs of mineral properties are capitalized. When production is attained, amortization is calculated on a straight-line basis. Estimated life for the current project is 10 years. If properties are abandoned or sold, they are written off. If properties are considered to be impaired in value, the costs of the properties are written down to their estimated fair value at that time.
	Exploration, evaluation and development costs
	Exploration and evaluation expenses consist of labor, annual exploration lease and maintenance fees and associated costs of the exploration geology department as well as land holding and exploration costs including drilling and analysis on properties which have not reached the permitting or operations stage. Development expense relates to the Company’s Lost Creek and LC East projects, which are more advanced in terms of permitting and development.
	Development expenditures for wellfields that are either in production or are being prepared for production, including the cost of wells, pumps, piping, and header houses, are expensed as incurred.
	Capital assets
	Property, plant and equipment assets, including machinery, processing equipment, enclosures, vehicles and expenditures that extend the life of such assets, are recorded at cost including acquisition and installation costs. The costs of self-constructed assets include direct construction costs, direct overhead and allocated interest during the construction phase. Depreciation is calculated using a declining balance method for most assets with the exception of the plant enclosure and related equipment. Depreciation on the plant enclosure and related equipment is calculated on a straight-line basis. Estimated lives for depreciation purposes range from three years for computer equipment and software to 20 years for the plant enclosure and equipment.
	Equity investments
	Investments in which the Company has a significant influence are accounted for using the equity method, whereby the Company records its proportionate share of the investee’s income or loss.
	Impairment of long-lived assets
	The Company assesses the possibility of impairment in the net carrying value of its long-lived assets when events or circumstances indicate that the carrying amounts of the asset or asset group may not be recoverable. When potential impairment is indicated, management calculates the estimated undiscounted future net cash flows relating to the asset or asset group using estimated future prices, recoverable resources, and operating, capital and reclamation costs. When the carrying value of an asset exceeds the related undiscounted cash flows, the asset is written down to its estimated fair value, which is determined using discounted future cash flows or other measures of fair value.
	Asset retirement obligations
	For mining properties, various federal and state mining laws and regulations require the Company to reclaim the surface areas and restore underground water quality to the pre-existing quality or class of use after the completion of mining. The Company records the fair value of an asset retirement obligation as a liability in the period in which it incurs an obligation associated with the retirement of tangible long-lived assets that result from the acquisition, construction, development and/or normal use of the assets.
	Asset retirement obligations consist of estimated final well closures, plant closure and removal and associated ground reclamation costs to be incurred by the Company in the future. The estimated fair value of the asset retirement obligation is based on the current cost escalated at an inflation rate and discounted at a credit adjusted risk-free rate. This liability is capitalized as part of the cost of the related asset and amortized over its useful life. The liability accretes until the Company settles the obligation.
	Revenue recognition
	The recognition of revenue from the sale of U3O8 is in accordance with the guidelines outlined in ASC Section 605-10-25, Revenue Recognition. The Company delivers U3O8  to a conversion facility and receives credit for a specified quantity measured in pounds once the product is confirmed to meet the required specifications. When a delivery is approved, the Company notifies the conversion facility with instructions for a title transfer to the customer. Revenue is recognized once a title transfer of the U3O8  is confirmed by the conversion facility.
	In 2013, the Company sold two years of delivery commitments to an independent broker. The proceeds were recorded as deferred revenue until the broker or purchaser acknowledged the deliveries had been made at which time, the portion of the sale relating to those deliveries was taken into sales revenue.
	Stock-based compensation
	All stock-based compensation payments made to employees, directors and consultants are accounted for in the consolidated financial statements. Stock-based compensation cost is measured at the grant date based on the fair value of the reward and is recognized over the related service period. Stock-based compensation cost is charged to construction, exploration and evaluation, development, and general and administrative expense on the same basis as other compensation costs.
	Income taxes
	The Company accounts for income taxes under the asset and liability method which requires the recognition of future income tax assets and liabilities for the expected future tax consequences of temporary differences between the carrying amounts and tax bases of assets and liabilities. The Company provides a valuation allowance on future tax assets unless it is more likely than not that such assets will be realized.
	Loss per common share
	Basic loss per common share is calculated based upon the weighted average number of common shares outstanding during the period. The diluted loss per common share, which is calculated using the treasury stock method, is equal to the basic loss per common share due to the anti-dilutive effect of stock options, restricted share units and share purchase warrants outstanding.
	Classification of financial instruments
	The Company’s financial instruments consist of cash, short-term investments, accounts receivable, restricted cash, deposits, accounts payable and accrued liabilities, other liabilities and notes payable. The Company has made the following classifications for these financial instruments:
		·	Cash, accounts receivable, restricted cash and deposits are recorded at amortized cost. Interest income is recorded using the effective interest rate method and is included in income for the period.
		·	Accounts payable and accrued liabilities and notes payable are measured at amortized cost.
		·	Other liabilities, which relates to the derivative on the warrant issued in U.S. dollars, are adjusted to the market value at the end of each reporting period.
	Out of period adjustment
	During the second quarter of 2014, we recorded an out of period adjustment due to the reclassification of severance and ad valorem taxes as a cost of extraction instead of a direct cost of sale.
	New accounting pronouncements
	In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers. Under ASU 2014-09, an entity will recognize revenue when it transfers promised goods or services to customers in an amount that reflects what it expects in exchange for the goods or services. It also requires more detailed disclosures to enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. This guidance is effective for annual periods beginning on or after December 15, 2016. The adoption of this standard is not expected to have a material impact on the financial statements of the Company.

Cash

Cash	12 Months Ended
	Dec. 31, 2014
Cash [Abstract]
Cash	4.Cash
	The Company’s cash consists of the following:
		As of December 31,	As of December 31,
		2014	2013
		$	$
	Cash on deposit at banks	431	296
	Money market funds	2,673	1,331
		3,104	1,627

Accounts_Receivable

Accounts Receivable	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Accounts Receivable	5.Accounts Receivable
	The Company’s accounts receivable consist of the following:
		As of December 31,	As of December 31,
		2014	2013
		$	$
	Trade accounts receivable
	Company A	-	3,895
	Company B	-	1,768
	Other Companies	19	66
	Total trade receivables	19	5,729
	Other receivables	9	73
	Total accounts receivable	28	5,802
	The names of Company A and Company B have not been disclosed for confidentiality reasons.

Inventory

Inventory	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
Inventory	6.Inventory
	The Company’s inventory consists of the following:
		As of December 31,	As of December 31,
		2014	2013
		$	$
	In-process inventory	2,084	765
	Plant inventory	882	1,136
	Conversion facility inventory	2,202	152
		5,168	2,053
	As of December 31, 2014, there was no inventory carried at excess of net realizable value.

Restricted_Cash

Restricted Cash	12 Months Ended
	Dec. 31, 2014
Restricted Cash and Investments, Current [Abstract]
Restricted cash	7.Restricted Cash
	The Company’s restricted cash consists of the following:
		As of December 31,	As of December 31,
		2014	2013
		$	$
	Money market account (a)	7,456	4,955
	Certificates of deposit (b)	100	100
		7,556	5,055
		(a)	The bonding requirements for reclamation obligations on various properties have been agreed to by the Wyoming Department of Environmental Quality, United States Department of the Interior and United States Nuclear Regulatory Commission. The restricted money market accounts are pledged as collateral against performance surety bonds which are used to secure the potential costs of reclamation related to those properties. Surety bonds providing $26,537 of coverage towards specific reclamation obligations are collateralized by $7,456 of the restricted cash at December 31, 2014.
		(b)	A certificate of deposit ($100) provides security for the Company’s credit cards.

Mineral_Properties

Mineral Properties	12 Months Ended
	Dec. 31, 2014
Mineral Industries Disclosures [Abstract]
Mineral Properties
	8. Mineral Properties
	The Company’s mineral properties consist of the following:
		USA			Canada	Total
		Lost Creek	Pathfinder	Other US	Canadian
		Property	Mines	Properties	Properties
		$	$	$	$	$
	Balance, December 31, 2012	15,505	-	17,471	525	33,501
	Acquisition costs	10,276	-	-	-	10,276
	Royalty acquired for common stock	783	-	-	-	783
	Property write-offs	-	-	-1,430	-	-1,430
	Functional Currency exchange rate adjustment (a)	-2,443	-	-2,831	-	-5,274
	Reporting exchange rate adjustment (b)	-	-	-	-36	-36
	Amortization	-435	-	-	-	-435
	Purchase of Pathfinder Mines	-	15,317	-	-	15,317
						-
	Balance, December 31, 2013	23,686	15,317	13,210	489	52,702
	Acquisition costs	8	42	-	-	50
	Increase in reclamation costs	-	5,669	-	-	5,669
	Reporting exchange rate adjustment (b)	-	-	-	-6	-6
	Property write-offs	-	-	-	-483	-483
	Amortization	-5,182	-	-	-	-5,182
	Balance, December 31, 2014	18,512	21,028	13,210	-	52,750
		(a)	As a result of the change in functional currency, a CTA as of the date of conversion reduced the reported cost of the U.S. mineral properties by $5.3 million.
		(b)	The adjustments reflect adjustments due to changes in the year end spot rate for Canadian properties.
	United States
	Lost Creek Property
	The Company acquired certain Wyoming properties when Ur-Energy USA Inc. entered into the Membership Interest Purchase Agreement (“MIPA”) with New Frontiers Uranium, LLC in 2005. Under the terms of the MIPA, the Company purchased 100% of NFU Wyoming, LLC. Assets acquired in this transaction include the Lost Creek Project, other Wyoming properties and development databases. NFU Wyoming, LLC was acquired for aggregate consideration of $20 million plus interest. Since 2005, the Company has increased its holdings adjacent to the initial Lost Creek acquisition through staking additional claims and additional property purchases and leases.
	In April 2013, the Company executed a royalty purchase agreement with the royalty holder who owned the only private royalty reserved on the Lost Creek Project. The 1.67% royalty had existed with respect to future production of uranium on 20 mining claims at the Lost Creek Project. The Company issued one million common shares of the Company with a fair value of $763 in full consideration of the conveyance and termination of the royalty interest. There is a royalty on each of the State of Wyoming sections under lease at the Lost Creek, LC West and EN Projects, as required by law. Other royalties exist on certain mining claims at the LC South and EN Projects. There are no royalties on the mining claims in the LC North, LC East or LC West Projects.
	In September 2013, after the Company commenced mineral extraction and production at the Lost Creek Project, it began amortizing the related mineral properties on a straight-line basis.
	Pathfinder Mines Corporation
	The Company acquired additional Wyoming properties when Ur-Energy USA Inc. closed a Share Purchase Agreement (“SPA”) with an AREVA Mining affiliate in December 2013. Under the terms of the SPA, the Company purchased Pathfinder Mines Corporation (“Pathfinder”) to acquire additional proven mineral properties. Assets acquired in this transaction include the Shirley Basin mine, portions of the Lucky Mc mine, machinery and equipment, vehicles, office equipment and development databases. Pathfinder was acquired for aggregate consideration of $6.7 million, a 5% production royalty under certain circumstances and the assumption of $5.7 million in estimated asset reclamation obligations. The purchase price allocation attributed $5.7 million to asset retirement obligations, $3.3 million to deferred tax liabilities, $15.3 million to mineral properties and the balance to the remaining assets and liabilities.
	Other U.S. properties
	In June 2013, the Company decided to abandon the South Granite Mountains project by not paying the claim fees due later in 2013. The cost of that project of $261 was written off.
	In January 2014, the Company decided to abandon the Mustang project in Nebraska. During 2014, the Company notified the leaseholders of the terminations when the lease renewals become due. The cost of that project of $1,168 was written off in 2013 as there was no value to the Company as of December 31, 2013.
	Canada
	The claims at Screech Lake and Bugs reached a  point during 2014 where the Company needed to take the properties to lease (or make related notices) under the mining regulations and invest in additional exploration or release the claims.  The Company elected not to pursue further exploration at these sites.  As a result of those decisions, the Company also decided to permit the claims at Gravel Hill, which had been on regulatory suspension relief, to lapse.  As a result, the claims were abandoned and the cost of the assets was written off.
	The holder of the Mountain Lake and Dismal Lake claims also abandoned their claims on those properties.  As a result, the royalties the Company held on those properties also became worthless and were written off in 2014.

Capital_Assets

Capital Assets	12 Months Ended
	Dec. 31, 2014
Capital Assets
Capital Assets	9.Capital Assets
	The Company’s capital assets consist of the following:
		As of			As of
		31-Dec-14			December 31, 2013
			Accumulated	Net Book		Accumulated	Net Book
		Cost	Depreciation	Value	Cost	Depreciation	Value
		$	$	$	$	$	$
	Rolling stock	3,878	2,852	1,026	3,860	2,366	1,494
	Enclosures	32,968	1,927	31,041	32,936	279	32,657
	Machinery and equipment	992	426	566	903	343	560
	Furniture, fixtures and leasehold improvements	119	81	38	121	64	57
	Information technology	1,119	797	322	1,067	585	482
		39,076	6,083	32,993	38,887	3,637	35,250
	In August 2013, the Company received permission from the NRC to begin production at the Lost Creek facility. At that time, the Company reclassified its construction in progress assets to buildings and enclosures as well as machinery and equipment.
	Capitalized interest and loan fees included in capital assets totaled approximately $1.3 million. Capitalized depreciation on construction equipment totaled $0.5 million.  Total depreciation expense was $7.6 million, $0.5 million and $0.5 million for the years ended December 31, 2014, 2013 and 2012, respectively.

Equity_Investment

Equity Investment	12 Months Ended
	Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]
Equity Investment
	10.Equity Investment
	Following its earn-in to The Bootheel Project, LLC in 2009, Crosshair Energy Corporation, now Jet Metals Corp (“Jet Metals”), was required to fund 75% of the Project’s expenditures and the Company the remaining 25%. The Project has been accounted for using the equity accounting method with the Company’s proportionate share of the Project’s loss included in the Consolidated Statement of Operations since the date of earn-in and the Company’s net investment is reflected on the Consolidated Balance Sheet. Under the terms of the agreement, the Company elected not to participate financially for the Project’s financial year ended March 31, 2012 which reduced the Company’s ownership percentage to 19.1%. The equity accounting method has been continued because of the Company’s ability to directly influence the budget process and therefore the operations of the Project. The Company resumed participation financially for the year ended March 31, 2013 and subsequent years.  The state leases and claims are being maintained by the venture.
	At December 31, 2014, the Company performed an impairment test on the remaining Bootheel property and determined that no impairment was necessary.

Accounts_Payable_and_Accrued_L

Accounts Payable and Accrued Liabilities	12 Months Ended
	Dec. 31, 2014
Payables and Accruals [Abstract]
Accounts Payable and Accrued Liabilities	11.Accounts Payable and Accrued Liabilities
	Accounts payable and accrued liabilities consist of the following:
		As of December 31,	As of December 31,
		2014	2013
		$	$
	Accounts payable	1,503	1,508
	Severance and ad valorem tax payable	1,947	682
	Payroll and other taxes	1,082	510
	Accounts payable - Capital assets	-	228
		4,532	2,928

Notes_Payable

Notes Payable	12 Months Ended
	Dec. 31, 2014
Notes Payable [Abstract]
Notes Payable	12.Notes Payable
	On May 13, 2013, the Company entered into a bridge loan agreement (the "Bridge Loan") with RMBAH. The Bridge Loan was in the amount of $5.0 million and was funded on May 14, 2013. The Bridge Loan provided interim working capital for Lost Creek project development prior to receiving funds to be provided by either the State of Wyoming or the RMBAH loan facility discussed below. The Bridge Loan provided for interest at 7.5% per annum in addition to a 4% origination fee all of which was capitalized as construction period borrowing cost. The Company was required to repay the Bridge Loan upon receipt of funds from any source in an amount exceeding $6.0 million or at the maturity date of July 31, 2013. Accordingly, the Bridge Loan was repaid with proceeds from the senior secured loan facility (the “First Loan Facility”) described below.
	On June 24, 2013, the Company entered into a $20.0 million First Loan Facility with RMBAH. The First Loan Facility was intended to fund the acquisition and advancement of the Pathfinder assets in Wyoming, and provide other interim Lost Creek development costs pending final approval of the State Bond Loan discussed below. The First Loan Facility was fully drawn as of June 30, 2013 and carried interest at 7.5% plus the three month LIBOR rate recalculated at the start of each calendar quarter, approximately 7.77%. In addition, the Company issued 4,294,167 warrants at an exercise price of Cdn$1.20 per common share with a three-year expiry. Using the Black-Scholes calculations as discussed in note 18, the warrants were calculated to have a value of approximately $3.1 million. The Company also paid an arrangement fee of 6% ($1.2 million) and legal fees to RMBAH totaling approximately $0.2 million. The total effective interest rate on the First Loan Facility is 21.6%. The loan was repaid on October 23, 2013 from the proceeds of the State Bond Loan, however, up to $5.0 million was available to the Company to be redrawn for the purpose of acquiring Pathfinder.
	The repayment created a loss from the early extinguishment of debt of $4,032 from the write-off of unamortized deferred loan costs. This amount was redrawn on December 19, 2013 for the acquisition of Pathfinder. The interest rate was approximately 7.75%. Principal payments of $1.25 million each are due quarterly commencing on March 31, 2014. On March 14, 2014, the loan was amended to change the interest rate, extend the loan maturity date to March 31, 2016 and increase the current loan to $10.0 million which included an additional line of credit of $3.5 million as a result of the completion and results of the Technical Report (NI 43-101) on the newly-acquired Shirley Basin property. On March 14, 2014, the Company also drew down an additional $1.5 million on its First Loan Facility.  On September 19, 2014, the Company drew down the $3.5 million line of credit.  The amended interest rate is approximately 8.75%. Principal payments of $0.81 million are due quarterly.
	In August 2013, the Company entered into a $15.0 million second loan facility (the “Second Loan Facility”) with RMBAH. This Second Loan Facility was intended to allow the Company to complete the construction of the Lost Creek facility pending the approval and funding of the State Bond Loan discussed below. In addition, the Company issued 3,100,800 warrants at an exercise price of Cdn$1.25 per common share and a three-year expiry. Using the Black-Scholes calculations as discussed in note 18, the warrants were calculated to have a value of approximately $1.1 million. The Company also paid an arrangement fee of 6% ($0.9 million) and legal fees to RMBAH totaling approximately $0.1 million. The total effective interest rate on the Second Loan Facility is 16.1%. The loan was repaid on October 23, 2013 from the proceeds of the State Bond Loan. The repayment created a loss from the early extinguishment of debt of $1,622 from the write-off of unamortized deferred loan costs. At that time, one half (1,550,400) of the warrants were cancelled per terms of the facility.
	On October 15, 2013, the Sweetwater County Commissioners approved the issuance of a $34.0 million Sweetwater County, State of Wyoming, Taxable Industrial Development Revenue Bond (Lost Creek Project), Series 2013 (the “Sweetwater IDR Bond”) to the State of Wyoming, acting by and through the Wyoming State Treasurer, as purchaser. On October 23, 2013, the Sweetwater IDR Bond was issued and the proceeds were in turn loaned by Sweetwater County to Lost Creek ISR, LLC pursuant to a financing agreement dated October 23, 2013 (the “State Bond Loan”). The State Bond Loan calls for payments of interest at a fixed rate of 5.75% per annum on a quarterly basis commencing January 1, 2014. The principal is payable in 28 quarterly installments commencing January 1, 2015 and continuing through October 1, 2021. The State Bond Loan is collateralized by all of the assets at the Lost Creek Project. As a condition of the financing, the RMBAH First and Second Loan Facilities together with certain construction equipment loans were paid off with the funding proceeds from the State Bond Loan.
	Deferred loan fees includes legal fees, commissions, commitment fees and other costs associated with obtaining the various financings. Those fees amortizable within 12 months of the statement date are considered current assets. Interest expense in 2013 includes a loss of $5,654 from the early extinguishment of the RMB First and Second Loan Facilities due to the write-off of unamortized deferred financing costs.
	The following table lists the current and long term portion of each of the Company’s debt instruments at December 31, 2014 and December 31, 2013:
		As at	As at
		December 31, 2014	December 31, 2013
	Current debt
	Sweetwater County bond	4,124	-
	RMBAH First Loan Facility	3,250	5,000
	Insurance premium financing	-	153
		7,374	5,153
	Long term debt
	Sweetwater County bond	28,881	34,000
	RMBAH First Loan Facility	4,312	-
		33,193	34,000
	Schedule of payments on outstanding debt as of December 31, 2014:
	Debt	Total	2015	2016	2017	2018	2019	Subsequent	Maturity
	Sweetwater County Bond
	Principal	33,005	4,124	4,367	4,623	4,895	5,183	9,813	1-Oct-21
	Interest	7,052	1,810	1,568	1,311	1,039	752	572
	RMBAH First Loan Facility
	Principal	7,562	3,250	4,312	-	-	-		31-Mar-16
	Interest	658	562	96	-	-	-
	Total	48,277	9,746	10,343	5,934	5,934	5,935	10,385

Deferred_Revenue

Deferred Revenue	12 Months Ended
	Dec. 31, 2014
Deferred Revenue Disclosure [Abstract]
Deferred Revenue	13.Deferred Revenue
	In March 2013, the Company assigned the 2013 and 2014 contractual delivery obligations under two of its sales contracts to a natural resources trading company in exchange for a cash payment of $5.1 million. The Company reflected the related revenue when the related deliveries under the contracts were settled. As of December 31, 2014, all deliveries called for had been made and the revenue thereon recognized.

Income_taxes

Income taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income taxes
	14.Income Taxes
	A reconciliation of income taxes at the statutory Canadian income tax rate to net income taxes included in the accompanying statements of operations is as follows:
		Year ended December 31,
		2014	2013	2012
	Loss before income taxes	-8,749	-30,313	-17,558
	Statutory rate	26.50%	26.50%	26.50%
	Expected recovery of income tax	-2,318	-8,033	-4,663
	Effect of foreign tax rate differences	-619	-3,247	-1,570
	Non-deductible amounts	106	108	412
	Effect of changes in enacted future rates	65	-286	-40
	Effect of change in foreign exchange rates	-186	-161	-91
	Effect of stock based compensation	-	159	7
	Change in valuation allowance	2,952	11,460	5,945
		-	-	-
	Recovery of future income taxes	-	-	-
		-	-	-
	Deferred tax assets and liabilities reflect the net tax effects of net operating losses, credit carryforwards and temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and amounts used for income tax purposes. The components of the Company’s deferred tax assets and liabilities are as follows:
		As at December 31,
		2014	2013	2012
	Future income tax assets
	Deferred tax assets	8,074	8,337	14,301
	Net operating loss carry forwards	42,251	39,432	24,579
	Less:  valuation allowance	-50,325	-47,769	-38,880
		-	-	-
	Future income tax liabilities
	Mineral properties	3,345	3,345	-
	Net deferred tax liability	3,345	3,345	-
	Based upon the level of historical taxable loss, management believes it is more likely than not that the Company will not realize the benefits of these deductible differences and accordingly has established a full valuation allowance as of December 31, 2014 and 2013.
	As of December 31, 2014, the Company had the following net operating loss carryforwards available:
	Income tax loss carry forwards
	Canadian (expiring 2014 - 2034)			27,732
	United States Federal (expiring 2025 - 2034)			93,338
	The Company follows a comprehensive model for recognizing, measuring, presenting and disclosing uncertain tax positions taken or expected to be taken on a tax return. Tax positions must initially be recognized in the financial statements when it is more likely than not the position will be sustained upon examination by the tax authorities. Such tax positions must initially and subsequently be measured as the largest amount of tax benefit that has a greater than 50% likelihood of being realized upon ultimate settlement with the tax authority assuming full knowledge of the position and relevant facts.
	The Company currently has no uncertain tax positions and is therefore not reflecting any adjustments for such in its deferred tax assets.
	There are open statutes of limitations for tax authorities in U.S., Canada and state jurisdictions to audit the Company’s tax returns for the years ended December 31, 2011, 2012 and 2013.
	The Company’s policy is to account for income tax related interest and penalties in income tax expense in the accompanying statements of operations. There have been no income tax related interest or penalties assessed or recorded.
	Other comprehensive loss was not subject to income tax effects and is therefore shown net of taxes.

Asset_Retirement_and_Reclamati

Asset Retirement and Reclamation Obligations	12 Months Ended
	Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement and Reclamation Obligations
	15.Asset Retirement and Reclamation Obligations
	Asset retirement obligations ("ARO") for the Lost Creek Project are equal to the present value of all estimated future costs required to remediate any environmental disturbances that exist as of the end of the period, using discount rates ranging from 0.3% to 3.3%.  Included in this liability are the costs of closure, reclamation, demolition and stabilization of the mines, processing plants, infrastructure, aquifer restoration, waste dumps and ongoing post-closure environmental monitoring and maintenance costs. At December 31, 2014, the total undiscounted amount of the future cash needs was estimated to be $12.1 million. The schedule of payments required to settle the ARO liability extends through 2033.
	Asset retirement obligations for the Pathfinder properties are equal to the present value of all estimated future costs required to remediate any environmental disturbances that exist as of the end of the period, using a discount rate of 3.0%.  Included in this liability are the costs of closure, reclamation, demolition and stabilization of the mines, processing plants, infrastructure, aquifer restoration, waste dumps and ongoing post-closure environmental monitoring and maintenance costs. At December 31, 2014, the total undiscounted amount of the future cash needs was estimated to be $12.7 million. The schedule of payments required to settle the ARO liability extends through 2033.
	The undiscounted future cash needs are based on information provided to the State of Wyoming in conjunction with annual reclamation bonding renewals.  Increases in the estimated future cash needs are normally based on increased disturbances projected for the upcoming year.  In 2014, there was no increase in the estimated liability on the Lost Creek Project as the anticipated disturbance was less than what had been projected in the previous year.  In addition, the Company submitted their initial report to the state since acquiring the Pathfinder properties.  The total estimated liability was significantly greater than what had been reflected on the Pathfinder financial statements at of the date of the acquisition in 2013.  As a result, the estimated liability was revised in 2014 to reflect the estimates calculated by Company personnel.
	The restricted cash as discussed in note 7 is related to surety bonds and letters of credit which provide security to the related governmental agencies on these obligations.
		Year ended	Year ended
		December 31, 2014	December 31, 2013
		$	$
	Beginning of year	17,279	957
	Liabilities incurred	-	10,639
	Assumed in Pathfinder Mines Corporation purchase	-	5,656
	Change in estimated liability	5,669	-
	Accretion expense	497	27
	End of period	23,445	17,279

Other_Liabilities

Other Liabilities	12 Months Ended
	Dec. 31, 2014
Other Liabilities Disclosure [Abstract]
Other Liabilities	16.Other Liabilities
	The Company completed a private placement in December 2013. In connection with this, the Company issued units consisting of one common share and one half warrants. The warrants are priced at US$1.35 which created a non-hedging derivative financial instrument. The liability created is adjusted to a calculated fair value quarterly using the Black-Scholes technique described in note 17 as there is no active market for the warrants. Any income or loss is reflected in net income for the year. The revaluation resulted in a gain of $946 thousand.

Shareholders_Equity_and_Capita

Shareholders' Equity and Capital Stock	12 Months Ended
	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Shareholders' Equity
	17.Shareholders’ Equity and Capital Stock
	Common share issuances
	During the year ended December 31, 2014, the Company exchanged 182,194 common shares for vested Restricted Share Units (“RSUs”). In addition, 1,623,139 stock options were exercised for proceeds of $1.3 million.
	During the year ended December 31, 2013, the Company exchanged 338,451 common shares for vested Restricted Share Units (“RSUs”). In addition, 377,927 stock options were exercised for proceeds of $0.3 million.
	On December 19, 2013, the Company completed a private placement of 4,709,089 units consisting of one share of common stock and one half warrant at $1.10 per unit raising gross proceeds of $5.1 million. Total direct share issue costs, including the placement agents’ commission, were $0.2 million.
	During the year ended December 31, 2012, 88,473 common shares were issued pursuant to the exercise of stock options for proceeds of $0.1 million. In addition, the Company exchanged 120,359 common shares for vested RSUs.
	On February 23, 2012, the Company completed a private placement of 17,250,000 common shares at $1.00 per share raising gross proceeds of $17.3 million. Total direct share issue costs, including the placement agents’ commission, were $1.0 million.
	Stock options
	In 2005, the Company’s Board of Directors approved the adoption of the Company's stock option plan (the “Option Plan”). Eligible participants under the Option Plan include directors, officers, employees and consultants of the Company. Under the terms of the Option Plan, stock options generally vest with Option Plan participants as follows: 10% at the date of grant; 22% four and one-half months after grant; 22% nine months after grant; 22% thirteen and one-half months after grant; and the balance of 24% eighteen months after the date of grant.
	Activity with respect to stock options is summarized as follows:
						Weighted-
				Options		average
				#		exercise price
						$
	Outstanding, December 31, 2011			6,413,902		1.75
	Granted			3,114,207		0.87
	Exercised			-88,473		0.85
	Forfeited			-145,414		1.99
	Expired			-782,500		3.25
	Outstanding, December 31, 2012			8,511,722		1.32
	Granted			1,876,670		1.07
	Exercised			-377,927		0.79
	Forfeited			-31,806		0.78
	Expired			-705,000		1.69
	Outstanding, December 31, 2013			9,273,659		1.19
	Granted			1,136,776		0.93
	Exercised			-1,623,139		0.83
	Forfeited			-303,612		1.45
	Expired			-15,070		0.82
	Outstanding, December 31, 2014			8,468,614		1.21
	The exercise price of a new grant is set at the closing price for the stock on the Toronto Stock Exchange (TSX) on the trading day immediately preceding the grant date so there is no intrinsic value as of the date of grant. The fair value of options vested during the year ended December 31, 2014 was $0.8 million.
	As of December 31, 2014, outstanding stock options are as follows:
			Options outstanding					Options exercisable
					Weighted-				Weighted-
					average		Aggregate		average	Aggregate
	Exercise				remaining		Intrinsic		remaining	Intrinsic
	price		Number		contractual		Value	Number	contractual	Value
	$		of options		life (years)		$	of options	life (years)	$	Expiry
	0.7		455,595		0.2		59	455,595	0.2	59	5-Mar-15
	2.47		1,227,034		1.1		-	1,227,034	1.1	-	28-Jan-16
	1.35		545,000		1.5		-	545,000	1.5	-	7-Jul-16
	1.01		657,782		1.7		-	657,782	1.7	-	9-Sep-16
	1		200,000		1.8		-	200,000	1.8	-	24-Oct-16
	0.78		956,382		2		58	956,382	2	58	12-Jan-17
	1.2		200,000		2.1		-	200,000	2.1	-	1-Feb-17
	1.01		100,000		2.2		-	100,000	2.2	-	1-Mar-17
	0.65		1,330,542		2.9		229	1,330,542	2.9	229	7-Dec-17
	0.66		594,152		3.3		97	594,152	3.3	97	25-Apr-18
	1.07		100,000		3.6		-	76,000	3.6	-	1-Aug-18
	1.03		965,351		4		-	522,857	4	-	27-Dec-18
	1.44		100,000		4.2		-	54,000	4.2	-	31-Mar-19
	0.88		1,036,776		4.9		-	103,678	4.9	-	12-Dec-19
	1.21		8,468,614		2.6		443	7,023,022	2.2	443
	The aggregate intrinsic value of the options in the preceding table represents the total pre-tax intrinsic value for stock options with an exercise price less than the Company’s TSX closing stock price of Cdn$0.99 as of the last trading day in the year ended December 31, 2014, that would have been received by the option holders had they exercised their options as of that date. The total number of in-the-money stock options outstanding as of December 31, 2014 was 3,336,671. The total number of in-the-money stock options exercisable as of December 31, 2014 was 3,336,671.
	Restricted share units
	On June 24, 2010, the Company’s shareholders approved the adoption of the Company’s restricted share unit plan (the “RSU Plan”). Eligible participants under the RSU Plan include directors and employees, including officers, of the Company. Under the terms of the RSU Plan, RSUs vest with participants as follows: 50% on the first anniversary of the date of the grant and 50% on the second anniversary of the date of the grant.
	Activity with respect to RSUs is summarized as follows:
				Number		Weighted
				of		average grant
				RSUs		date fair value
						$
	Unvested, December 31, 2011			276,365		2.90
	Granted			703,572		0.92
Vested			-136,789		2.90
Forfeited			-16,723		1.68
Unvested, December 31, 2012			826,425		1.15
Granted			273,834		1.23
Vested			-402,581		1.89
Forfeited			-6,068		0.78
Unvested, December 31, 2013			691,610		0.90
Granted			259,192		1.20
Vested			-527,407		0.74
Forfeited			-43,960		0.92
Unvested, December 31, 2014			379,435		0.89
As of December 31, 2014, outstanding RSUs are as follows:
						Aggregate
		Number of		Remaining		Intrinsic
		unvested		life		Value
Grant date		options		(years)		$
27-Dec-13		120,243		0.98		102
12-Dec-14		259,192		1.94		220
		379,435		1.48		322
As of December 31, 2014, 280,529 RSUs had been vested but not redeemed.  In January, 2015, 215,168 were redeemed for common shares while the balance of 65,361 were redeemed to pay the related taxes due on redemption.
Upon RSU vesting, the holder of an RSU will receive one common share, for no additional consideration, for each RSU held.
Warrants
On December 19, 2013, the Company issued 2,354,545 warrants to purchase stock at $1.35 per share in connection with the sale of private placement units (see note 17). The First and Second Loan Facility account for the remainder of the warrants issued during 2013 (see note 12).
Activity with respect to warrants is summarized as follows:
			Number		Weighted-
			of		average
			Warrants		exercise price
					$
Outstanding, December 31, 2011			100,000		1.12
Granted			50,000		0.93
Outstanding, December 31, 2012			150,000		1.06
Granted			9,774,512		1.19
Cancelled			-1,550,400		1.17
Outstanding, December 31, 2013			8,374,112		1.19
Outstanding, December 31, 2014			8,374,112		1.19
As of December 31, 2014, outstanding warrants are as follows:
						Aggregate
Exercise				Remaining		Intrinsic
price		Number		contractual		Value
$		of warrants		life (years)		$	Expiry
0.92		50,000		0.7		-	4-Sep-15
1.12		100,000		0.8		-	1-Nov-15
0.93		25,000		1.2		-	5-Mar-16
1.35		2,354,545		2		-	19-Dec-16
1.12		4,294,167		3.5		-	24-Jun-18
1.17		1,550,400		3.6		-	27-Aug-18
		8,374,112		3		-
Share-based compensation expense
Stock-based compensation expense was $0.9 million, $1.2 million and $2.4 million for the years ended December 31, 2014, 2013 and 2012, respectively.
As of December 31, 2014, there was approximately $0.6 million of total unrecognized compensation expense (net of estimated pre-vesting forfeitures) related to unvested share-based compensation arrangements granted under the Option Plan and $0.3 million under the RSU Plan. The expenses are expected to be recognized over a weighted-average period of 1.1 years and 1.6 years, respectively.
Cash received from stock options exercised during the years ended December 31, 2014, 2013 and 2012 was $1.3 million, $0.3 million and less than $0.1 million, respectively.
Fair Value Calculations
The initial fair value of RSUs, options and warrants granted during the years ended December 31, 2014, 2013 and 2012 was determined using the Black-Scholes option pricing model with the following assumptions:
	2014	2013	2012
Expected warrant life (years)	-	1.5 - 3	1.5
Expected option life (years)	3.49-3.56	3.41-3.51	3.29 - 3.37
Expected volatility	61-66%	61-66%	63-78%
Risk-free interest rate	1.1-1.4%	0.9-1.4%	1.0-1.3%
Forfeiture rate (warrants)	0.00%	0.00%	0.00%
Forfeiture rate (options)	4.5-4.7%	4.2-4.4%	4.6-4.8%
Forfeiture rate (RSUs)	8.10%	7.70%	12.5-22.3%
Expected dividend rate	0%	0%	0%
The Company estimates expected volatility using daily historical trading data of the Company’s common shares, because this is recognized as a valid method used to predict future volatility. The risk-free interest rates are determined by reference to Canadian Treasury Note constant maturities that approximate the expected option term. The Company has never paid dividends and currently has no plans to do so.
Share-based compensation expense is recognized net of estimated pre-vesting forfeitures, which results in recognition of expense on options that are ultimately expected to vest over the expected option term. Forfeitures were estimated using actual historical forfeiture experience.
The fair value used for the RSUs issued in December 2014, December 2013 and December 2012 was $0.96,  $1.20 and $0.82 per unit, respectively which was the closing price of the stock on the TSX as of the trading days immediately preceding the grant dates.

Sales

Sales	12 Months Ended
	Dec. 31, 2014
Revenue [Abstract]
Sales	18.Sales
	Revenue is primarily derived from the sale of U3O8 to domestic utilities under contracts or spot sales. In 2013, the Company also sold its 2013 and 2014 deliveries under two of its contracts to a third party broker. The income was recognized in the years in which the respective deliveries were completed.
	Revenue consists of:
		Year ended December 31,		Year ended December 31,
		2014		2013
		$		$
	Company A	10,123	34.5%	3,426	45.0%
	Company B	9,199	31.4%	1,555	20.4%
	Company C	7,197	24.5%	-	0.0%
		26,519	90.4%	4,981	65.4%
	Disposal fees	323	1.1%	-	0.0%
	Recognition of gain from sale of deliveries under assignment	2,507	8.5%	2,635	34.6%
		29,349	100.0%	7,616	100.0%
	During the second quarter of 2014, we recorded an out of period adjustment due to the reclassification of severance and ad valorem taxes as a cost of extraction instead of a direct cost of sale.

Financial_instruments

Financial instruments	12 Months Ended
	Dec. 31, 2014
Investments, All Other Investments [Abstract]
Financial instruments	19.Financial instruments
	The Company’s financial instruments consist of cash and cash equivalents, accounts receivable, restricted cash, deposits, accounts payable and accrued liabilities and notes payable. The Company is exposed to risks related to changes in foreign currency exchange rates, interest rates and management of cash and cash equivalents and short-term investments
	Credit risk
	Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash and cash equivalents and restricted cash. These assets include Canadian dollar and U.S. dollar denominated certificates of deposits, money market accounts and demand deposits. They bear interest at annual rates ranging from 0.18% to 0.4% and mature at various dates up to August 27, 2015. These instruments are maintained at financial institutions in Canada and the United States. Of the amount held on deposit, approximately $0.9 million is covered by the Canada Deposit Insurance Corporation, the Securities Investor Protection Corporation or the United States Federal Deposit Insurance Corporation, leaving approximately $9.8 million at risk at December 31, 2014 should the financial institutions with which these amounts are invested be rendered insolvent. The Company does not consider any of its financial assets to be impaired as of December 31, 2014.
	Liquidity risk
	Liquidity risk is the risk that the Company will not be able to meet its financial obligations as they come due.
	The Company has financed its operations from its inception primarily through the issuance of equity securities and debt instruments. Production commenced in August 2013 after receiving final operational clearance from the NRC. Product sales commenced in December 2013.
	As at December 31, 2014, the Company’s financial liabilities consisted of trade accounts payable and accrued trade and payroll liabilities of $3.0 million which are due within normal trade terms of generally 30 to 60 days, notes payable which will be payable over periods of 0 to 7 years, and asset retirement obligations with estimated completion dates until 2033.
	Market risk
	Market risk is the risk to the Company of adverse financial impacts due to changes in the fair value or future cash flows of financial instruments as a result of fluctuations in interest rates and foreign currency exchange rates.
	Interest rate risk
	Financial instruments that expose the Company to interest rate risk are its cash equivalents, deposits, restricted cash and debt financings. The Company’s objectives for managing its cash and cash equivalents are to maintain sufficient funds on hand at all times to meet day to day requirements and to place any amounts considered in excess of day to day requirements on short-term deposit with the Company's financial institutions so that they earn interest.
	Currency risk
	The Company maintains a balance of less than $0.1 million in foreign currency resulting in a low currency risk.
	Sensitivity analysis
	The Company has completed a sensitivity analysis to estimate the impact that a change in interest rates would have on the net loss of the Company. This sensitivity analysis shows that a change of +/- 100 basis points in interest rate would have a $0.6 million impact for the year ended December 31, 2014. The financial position of the Company may vary at the time that a change in interest rates occurs causing the impact on the Company’s results to differ from that shown above.

Segmented_Information

Segmented Information	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Segmented information
	20.Segmented Information
	The Company’s operations comprise one reportable segment being the exploration and development of uranium resource properties. All of the Company’s production, sales and other mineral related operations are occurring in the United States. During 2014, the Company decided not to invest additional funds in its Canadian properties.  As a result, those claims were dropped and written off.  Effective December 31, 2014, the only assets in Canada are non-operating current assets.
	Non-current assets segmented by geographic area are as follows:
		December 31, 2014
		United States	Canada	Total
		$	$	$
	Restricted Cash	7,556	-	7,556
	Mineral properties	52,750	-	52,750
	Capital assets	32,993	-	32,993
	Investments	1,090	-	1,090
		94,389	-	94,389
		December 31, 2013
		United States	Canada	Total
		$	$	$
	Restricted Cash	5,055	-	5,055
	Mineral properties	52,213	489	52,702
	Capital assets	35,250	-	35,250
	Investments	1,085	-	1,085
		93,603	489	94,092

Commitments

Commitments	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments	21.Commitments
	Under the terms of its operating lease for office premises in Casper, Wyoming, the Company is committed to minimum annual lease payments as follows:
	Year ended December 31,	$
	2015	200
	2016	200
	2017	100
	2018 and thereafter	-
		500
	Rent expense under these agreements was $0.2 million, $0.2 million and $0.1 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	The Company has agreed to a Contingency and Development Agreement with Sweetwater County for the improvement of a county road servicing the Lost Creek facility. The Company’s portion of the cost will be approximately $200 thousand and will be due after the work is completed.
	Off Take Sales Agreements
	We currently have nine off take sales agreements with various North American utilities. Most recently, in February 2015, we executed a multi-year agreement for sales deliveries of 200,000 pounds of uranium concentrates annually. In March 2014, we entered into a uranium sales arrangement for production in 2014 and 2016. The agreements call for deliveries ranging between 150,000 to 250,000 pounds of uranium concentrate each year. Those agreements were amended to include additional deliveries in 2015. These agreements supplement earlier offtake arrangements which were completed beginning in 2011.
	SUMMARY OF OFF TAKE SALES AGREEMENTS
	Production Year	Total Pounds Uranium Concentrates Contractually Committed
	2015	630,000 pounds
	2016	662,000 pounds
	2017	600,000 pounds
	2018	500,000 pounds
	2019	400,000 pounds
	2020	200,000 pounds

Other_items_not_affecting_cash

Other items not affecting cash flow	12 Months Ended
	Dec. 31, 2014
Noncash Investing and Financing Items [Abstract]
Other Items Not Affecting Cash Flow
	22.Other items not affecting cash flow
		Year ended December 31,
		2014	2013	2012
		$	$	$
	Non-cash financing and investing activities:
	Common shares issued for properties	—	783	—
	Mineral property acquired in asset exchange	—	—	970

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation
	These financial statements have been prepared by management in accordance with United States generally accepted accounting principles (“US GAAP”) and include all of the assets, liabilities and expenses of the Company and its wholly-owned subsidiaries Ur-Energy USA Inc.; NFU Wyoming, LLC; Lost Creek ISR, LLC; NFUR Bootheel, LLC; Hauber Project LLC; NFUR Hauber, LLC; and Pathfinder Mines Corporation. All inter-company balances and transactions have been eliminated upon consolidation. Ur-Energy Inc. and its wholly-owned subsidiaries are collectively referred to herein as the “Company.”
Functional currency and presentation currency	Functional currency and presentation currency
	The Company changed its functional currency prospectively, beginning January 1, 2013, from the Canadian dollar to the U.S. dollar with respect to its operations in the United States. The change in functional currency had a significant impact on the Company’s consolidated financial statements as most of the non-current assets of the Company are situated in the United States and were previously accounted for using the Canadian dollar as the functional currency.  As of January 1, 2013, the Company recorded a cumulative transaction adjustment (“CTA”) of approximately $6.2 million for this change, which is shown in the consolidated statement of shareholders’ equity.
	The functional currency for Canadian operations will remain the Canadian dollar.  They will be consolidated with the U.S. cost basis balances using the spot rate for assets and liabilities, the historical cost rates for shareholders’ equity transactions and the average rate for all operating revenues and expenses.  Additional translation adjustments will result from the change in consolidation methods as prescribed by US GAAP where there are multiple functional currencies reflected in consolidated financial statements.  These adjustments will not be included in determining net income, but will be reported separately and accumulated in other comprehensive income.
	In addition, as a result of losing its foreign private issuer status, the Company changed its presentational currency from the Canadian dollar to U.S. dollars. As a result, comparative information has been changed.
Exploration Stage	Exploration Stage
	The Company has established the existence of mineral resources for certain uranium projects, including the Lost Creek property The Company has not established proven or probable reserves, as defined by the SEC under Industry Guide 7, through the completion of a “final” or “bankable” feasibility study for any of its uranium projects, including Lost Creek property. Furthermore, the Company has no plans to establish proven or probable reserves for any of its uranium projects for which the Company plans on utilizing in situ recovery (“ISR”) mining, such as the Lost Creek property or the Shirley Basin mine. As a result, and despite the fact that the Company commenced extraction of U3O8 at the Lost Creek property in August 2013, the Company remains in the Exploration Stage as defined under Industry Guide 7, and will continue to remain in the Exploration Stage until such time proven or probable reserves have been established.
	Since the Company commenced extraction of uranium resources at the Lost Creek property without having established proven and probable reserves, any mineral resources established or extracted from the Lost Creek property should not be in any way associated with having established or produced from proven or probable reserves.
	In accordance with US GAAP, expenditures relating to the acquisition of mineral rights are initially capitalized as incurred while exploration and pre-extraction expenditures are expensed as incurred until such time the Company exits the Exploration Stage by establishing proven or probable reserves. Expenditures relating to exploration activities such as drill programs to search for additional mineral resources are expensed as incurred. Expenditures relating to activities such as the construction of mine wellfields, header houses and disposal wells are expensed as incurred until such time proven or probable reserves are established for that uranium project, after which subsequent expenditures relating to mine development activities for that particular project are capitalized as incurred
	Companies in the Production Stage as defined under Industry Guide 7, having established proven and probable reserves and exited the Exploration Stage, typically capitalize expenditures relating to ongoing development activities, with corresponding depletion calculated over proven and probable reserves using the units-of-production method and allocated to future reporting periods to inventory and, as that inventory is sold, to cost of goods sold. The Company is in the Exploration Stage which has resulted in the Company reporting larger losses than if it had been in the Production Stage due to the expensing, instead of capitalizing, of expenditures relating to ongoing wellfield development activities. Additionally, there would be no corresponding amortization allocated to future reporting periods of the Company since those costs would have been expensed previously, resulting in both lower inventory costs and cost of goods sold and results of operations with higher gross profits and lower losses than if the Company had been in the Production Stage. Any capitalized costs, such as expenditures relating to the acquisition of mineral rights and asset retirement obligations, are amortized over the estimated mineral life using the straight-line method. As a result, the Company’s consolidated financial statements may not be directly comparable to the financial statements of companies in the Production Stage.
Use of estimates	Use of estimates
	The preparation of consolidated financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. The most significant estimates management makes in the preparation of these consolidated financial statements relate to potential impairment in the carrying value of the Company’s long-lived assets, fair value of stock-based compensation, valuation of the in-process inventory and estimation of asset retirement obligations. Actual results could differ from those estimates.
Restricted cash	Restricted cash
	Cash which is restricted contractually or which secures various instruments including surety bonds and letters of credit securing reclamation obligations is shown as restricted cash
Inventory	Inventory
	In-process inventory represents U3O8 that has been extracted from the wellfield and captured in the processing plant and is currently being transformed into a saleable product. Plant inventory is U3O8 that is contained in yellowcake, which has been dried and packaged in drums, but not yet shipped to the conversion facility. The amount of U3O8 in the plant inventory is determined by weighing and assaying the amount of U3O8 packaged into drums at the plant. Conversion facility inventory is U3O8 that has been shipped to the conversion facility. The amount of U3O8 in the conversion facility inventory includes the amount of U3O8 contained in drums shipped to the conversion facility plus or minus any final weighing and assay adjustments per the terms of the uranium supplier’s agreement with the conversion facility.
	The Company’s inventories are measured at the lower of cost or net realizable value and reflect the uranium content (“U3O8”) in various stages of the production and sales process including in-process inventory, plant inventory and conversion facility inventory. Operating supplies are expensed when purchased.
Mineral properties	Mineral properties
	Acquisition costs of mineral properties are capitalized. When production is attained, amortization is calculated on a straight-line basis. Estimated life for the current project is 10 years. If properties are abandoned or sold, they are written off. If properties are considered to be impaired in value, the costs of the properties are written down to their estimated fair value at that time.
Exploration, evaluation and development costs	Exploration, evaluation and development costs
	Exploration and evaluation expenses consist of labor, annual exploration lease and maintenance fees and associated costs of the exploration geology department as well as land holding and exploration costs including drilling and analysis on properties which have not reached the permitting or operations stage. Development expense relates to the Company’s Lost Creek and LC East projects, which are more advanced in terms of permitting and development.
	Development expenditures for wellfields that are either in production or are being prepared for production, including the cost of wells, pumps, piping, and header houses, are expensed as incurred.
Capital assets	Capital assets
	Property, plant and equipment assets, including machinery, processing equipment, enclosures, vehicles and expenditures that extend the life of such assets, are recorded at cost including acquisition and installation costs. The costs of self-constructed assets include direct construction costs, direct overhead and allocated interest during the construction phase. Depreciation is calculated using a declining balance method for most assets with the exception of the plant enclosure and related equipment. Depreciation on the plant enclosure and related equipment is calculated on a straight-line basis. Estimated lives for depreciation purposes range from three years for computer equipment and software to 20 years for the plant enclosure and equipment.
Equity investments	Equity investments
	Investments in which the Company has a significant influence are accounted for using the equity method, whereby the Company records its proportionate share of the investee’s income or loss.
Impairment of long-lived assets	Impairment of long-lived assets
	The Company assesses the possibility of impairment in the net carrying value of its long-lived assets when events or circumstances indicate that the carrying amounts of the asset or asset group may not be recoverable. When potential impairment is indicated, management calculates the estimated undiscounted future net cash flows relating to the asset or asset group using estimated future prices, recoverable resources, and operating, capital and reclamation costs. When the carrying value of an asset exceeds the related undiscounted cash flows, the asset is written down to its estimated fair value, which is determined using discounted future cash flows or other measures of fair value.
Asset retirement obligation	Asset retirement obligations
	For mining properties, various federal and state mining laws and regulations require the Company to reclaim the surface areas and restore underground water quality to the pre-existing quality or class of use after the completion of mining. The Company records the fair value of an asset retirement obligation as a liability in the period in which it incurs an obligation associated with the retirement of tangible long-lived assets that result from the acquisition, construction, development and/or normal use of the assets.
	Asset retirement obligations consist of estimated final well closures, plant closure and removal and associated ground reclamation costs to be incurred by the Company in the future. The estimated fair value of the asset retirement obligation is based on the current cost escalated at an inflation rate and discounted at a credit adjusted risk-free rate. This liability is capitalized as part of the cost of the related asset and amortized over its useful life. The liability accretes until the Company settles the obligation.
Revenue recognition	Revenue recognition
	The recognition of revenue from the sale of U3O8 is in accordance with the guidelines outlined in ASC Section 605-10-25, Revenue Recognition. The Company delivers U3O8  to a conversion facility and receives credit for a specified quantity measured in pounds once the product is confirmed to meet the required specifications. When a delivery is approved, the Company notifies the conversion facility with instructions for a title transfer to the customer. Revenue is recognized once a title transfer of the U3O8  is confirmed by the conversion facility.
	In 2013, the Company sold two years of delivery commitments to an independent broker. The proceeds were recorded as deferred revenue until the broker or purchaser acknowledged the deliveries had been made at which time, the portion of the sale relating to those deliveries was taken into sales revenue.
Stock-based compensation	Stock-based compensation
	All stock-based compensation payments made to employees, directors and consultants are accounted for in the consolidated financial statements. Stock-based compensation cost is measured at the grant date based on the fair value of the reward and is recognized over the related service period. Stock-based compensation cost is charged to construction, exploration and evaluation, development, and general and administrative expense on the same basis as other compensation costs.
Income taxes	Income taxes
	The Company accounts for income taxes under the asset and liability method which requires the recognition of future income tax assets and liabilities for the expected future tax consequences of temporary differences between the carrying amounts and tax bases of assets and liabilities. The Company provides a valuation allowance on future tax assets unless it is more likely than not that such assets will be realized.
Loss per common share	Loss per common share
	Basic loss per common share is calculated based upon the weighted average number of common shares outstanding during the period. The diluted loss per common share, which is calculated using the treasury stock method, is equal to the basic loss per common share due to the anti-dilutive effect of stock options, restricted share units and share purchase warrants outstanding.
	Classification of financial instruments
	The Company’s financial instruments consist of cash, short-term investments, accounts receivable, restricted cash, deposits, accounts payable and accrued liabilities, other liabilities and notes payable. The Company has made the following classifications for these financial instruments:
		·	Cash, accounts receivable, restricted cash and deposits are recorded at amortized cost. Interest income is recorded using the effective interest rate method and is included in income for the period.
		·	Accounts payable and accrued liabilities and notes payable are measured at amortized cost.
		·	Other liabilities, which relates to the derivative on the warrant issued in U.S. dollars, are adjusted to the market value at the end of each reporting period.
Classification of financial instruments	Classification of financial instruments
	The Company’s financial instruments consist of cash, short-term investments, accounts receivable, restricted cash, deposits, accounts payable and accrued liabilities, other liabilities and notes payable. The Company has made the following classifications for these financial instruments:
		·	Cash, accounts receivable, restricted cash and deposits are recorded at amortized cost. Interest income is recorded using the effective interest rate method and is included in income for the period.
		·	Accounts payable and accrued liabilities and notes payable are measured at amortized cost.
		·	Other liabilities, which relates to the derivative on the warrant issued in U.S. dollars, are adjusted to the market value at the end of each reporting period.
Out of period adjustment	Out of period adjustment
	During the second quarter of 2014, we recorded an out of period adjustment due to the reclassification of severance and ad valorem taxes as a cost of extraction instead of a direct cost of sale.
New accounting pronouncements	New accounting pronouncements
	In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers. Under ASU 2014-09, an entity will recognize revenue when it transfers promised goods or services to customers in an amount that reflects what it expects in exchange for the goods or services. It also requires more detailed disclosures to enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. This guidance is effective for annual periods beginning on or after December 15, 2016. The adoption of this standard is not expected to have a material impact on the financial statements of the Company.

Cash_Tables

Cash (Tables)	12 Months Ended
	Dec. 31, 2014
Cash [Abstract]
Schedule Of Cash and Cash Equivalents
		As of December 31,	As of December 31,
		2014	2013
		$	$
	Cash on deposit at banks	431	296
	Money market funds	2,673	1,331
		3,104	1,627

Accounts_Receivable_Tables

Accounts Receivable (Tables)	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable
		As of December 31,	As of December 31,
		2014	2013
		$	$
	Trade accounts receivable
	Company A	-	3,895
	Company B	-	1,768
	Other Companies	19	66
	Total trade receivables	19	5,729
	Other receivables	9	73
	Total accounts receivable	28	5,802

Inventory_Tables

Inventory (Tables)	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
Schedule of Inventory, Current
		As of December 31,	As of December 31,
		2014	2013
		$	$
	In-process inventory	2,084	765
	Plant inventory	882	1,136
	Conversion facility inventory	2,202	152
		5,168	2,053

Restricted_Cash_Tables

Restricted Cash (Tables)	12 Months Ended
	Dec. 31, 2014
Restricted Cash and Investments, Current [Abstract]
Schedule of Restricted Cash and Cash Equivalents
		As of December 31,	As of December 31,
		2014	2013
		$	$
	Money market account (a)	7,456	4,955
	Certificates of deposit (b)	100	100
		7,556	5,055
		(a)	The bonding requirements for reclamation obligations on various properties have been agreed to by the Wyoming Department of Environmental Quality, United States Department of the Interior and United States Nuclear Regulatory Commission. The restricted money market accounts are pledged as collateral against performance surety bonds which are used to secure the potential costs of reclamation related to those properties. Surety bonds providing $26,537 of coverage towards specific reclamation obligations are collateralized by $7,456 of the restricted cash at December 31, 2014.
		(b)	A certificate of deposit ($100) provides security for the Company’s credit cards.

Mineral_Properties_Tables

Mineral Properties (Tables)	12 Months Ended
	Dec. 31, 2014
Mineral Industries Disclosures [Abstract]
Mineral Property
		USA			Canada	Total
		Lost Creek	Pathfinder	Other US	Canadian
		Property	Mines	Properties	Properties
		$	$	$	$	$
	Balance, December 31, 2012	15,505	-	17,471	525	33,501
	Acquisition costs	10,276	-	-	-	10,276
	Royalty acquired for common stock	783	-	-	-	783
	Property write-offs	-	-	-1,430	-	-1,430
	Functional Currency exchange rate adjustment (a)	-2,443	-	-2,831	-	-5,274
	Reporting exchange rate adjustment (b)	-	-	-	-36	-36
	Amortization	-435	-	-	-	-435
	Purchase of Pathfinder Mines	-	15,317	-	-	15,317
						-
	Balance, December 31, 2013	23,686	15,317	13,210	489	52,702
	Acquisition costs	8	42	-	-	50
	Increase in reclamation costs	-	5,669	-	-	5,669
	Reporting exchange rate adjustment (b)	-	-	-	-6	-6
	Property write-offs	-	-	-	-483	-483
	Amortization	-5,182	-	-	-	-5,182
	Balance, December 31, 2014	18,512	21,028	13,210	-	52,750
		(a)	As a result of the change in functional currency, a CTA as of the date of conversion reduced the reported cost of the U.S. mineral properties by $5.3 million.
		(b)	The adjustments reflect adjustments due to changes in the year end spot rate for Canadian properties.

Capital_Assets_Tables

Capital Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Capital Assets
Capital assets
		As of			As of
		31-Dec-14			December 31, 2013
			Accumulated	Net Book		Accumulated	Net Book
		Cost	Depreciation	Value	Cost	Depreciation	Value
		$	$	$	$	$	$
	Rolling stock	3,878	2,852	1,026	3,860	2,366	1,494
	Enclosures	32,968	1,927	31,041	32,936	279	32,657
	Machinery and equipment	992	426	566	903	343	560
	Furniture, fixtures and leasehold improvements	119	81	38	121	64	57
	Information technology	1,119	797	322	1,067	585	482
		39,076	6,083	32,993	38,887	3,637	35,250

Accounts_Payable_and_Accrued_L1

Accounts Payable and Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Payables and Accruals [Abstract]
Schedule of Accounts Payable and Accrued Liabilities
		As of December 31,	As of December 31,
		2014	2013
		$	$
	Accounts payable	1,503	1,508
	Severance and ad valorem tax payable	1,947	682
	Payroll and other taxes	1,082	510
	Accounts payable - Capital assets	-	228
		4,532	2,928

Notes_Payable_Tables

Notes Payable (Tables)	12 Months Ended
	Dec. 31, 2014
Notes Payable [Abstract]
Schedule of Debt
		As at	As at
		December 31, 2014	December 31, 2013
	Current debt
	Sweetwater County bond	4,124	-
	RMBAH First Loan Facility	3,250	5,000
	Insurance premium financing	-	153
		7,374	5,153
	Long term debt
	Sweetwater County bond	28,881	34,000
	RMBAH First Loan Facility	4,312	-
		33,193	34,000
Schedule of Maturities of Long-term Debt
	Debt	Total	2015	2016	2017	2018	2019	Subsequent	Maturity
	Sweetwater County Bond
	Principal	33,005	4,124	4,367	4,623	4,895	5,183	9,813	1-Oct-21
	Interest	7,052	1,810	1,568	1,311	1,039	752	572
	RMBAH First Loan Facility
	Principal	7,562	3,250	4,312	-	-	-		31-Mar-16
	Interest	658	562	96	-	-	-
	Total	48,277	9,746	10,343	5,934	5,934	5,935	10,385

Income_taxes_Tables

Income taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rate Reconciliation
		Year ended December 31,
		2014	2013	2012
	Loss before income taxes	-8,749	-30,313	-17,558
	Statutory rate	26.50%	26.50%	26.50%
	Expected recovery of income tax	-2,318	-8,033	-4,663
	Effect of foreign tax rate differences	-619	-3,247	-1,570
	Non-deductible amounts	106	108	412
	Effect of changes in enacted future rates	65	-286	-40
	Effect of change in foreign exchange rates	-186	-161	-91
	Effect of stock based compensation	-	159	7
	Change in valuation allowance	2,952	11,460	5,945
		-	-	-
	Recovery of future income taxes	-	-	-
		-	-	-
Schedule of Deferred Tax Assets and Liabilities
		As at December 31,
		2014	2013	2012
	Future income tax assets
	Deferred tax assets	8,074	8,337	14,301
	Net operating loss carry forwards	42,251	39,432	24,579
	Less:  valuation allowance	-50,325	-47,769	-38,880
		-	-	-
	Future income tax liabilities
	Mineral properties	3,345	3,345	-
	Net deferred tax liability	3,345	3,345	-
Summary of Operating Loss Carryforwards [Table Text Block]
	Income tax loss carry forwards
	Canadian (expiring 2014 - 2034)			27,732
	United States Federal (expiring 2025 - 2034)			93,338

Asset_Retirement_and_Reclamati1

Asset Retirement and Reclamation Obligations (Tables)	12 Months Ended
	Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]
Schedule of Asset Retirement Obligations
		Year ended	Year ended
		December 31, 2014	December 31, 2013
		$	$
	Beginning of year	17,279	957
	Liabilities incurred	-	10,639
	Assumed in Pathfinder Mines Corporation purchase	-	5,656
	Change in estimated liability	5,669	-
	Accretion expense	497	27
	End of period	23,445	17,279

Shareholders_Equity_and_Capita1

Shareholders' Equity and Capital Stock (Tables)	12 Months Ended
	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Schedule of Share-based Compensation, Stock Options, Activity
						Weighted-
				Options		average
				#		exercise price
						$
	Outstanding, December 31, 2011			6,413,902		1.75
	Granted			3,114,207		0.87
	Exercised			-88,473		0.85
	Forfeited			-145,414		1.99
	Expired			-782,500		3.25
	Outstanding, December 31, 2012			8,511,722		1.32
	Granted			1,876,670		1.07
	Exercised			-377,927		0.79
	Forfeited			-31,806		0.78
	Expired			-705,000		1.69
	Outstanding, December 31, 2013			9,273,659		1.19
	Granted			1,136,776		0.93
	Exercised			-1,623,139		0.83
	Forfeited			-303,612		1.45
	Expired			-15,070		0.82
	Outstanding, December 31, 2014			8,468,614		1.21
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range
			Options outstanding					Options exercisable
					Weighted-				Weighted-
					average		Aggregate		average	Aggregate
	Exercise				remaining		Intrinsic		remaining	Intrinsic
	price		Number		contractual		Value	Number	contractual	Value
	$		of options		life (years)		$	of options	life (years)	$	Expiry
	0.7		455,595		0.2		59	455,595	0.2	59	5-Mar-15
	2.47		1,227,034		1.1		-	1,227,034	1.1	-	28-Jan-16
	1.35		545,000		1.5		-	545,000	1.5	-	7-Jul-16
	1.01		657,782		1.7		-	657,782	1.7	-	9-Sep-16
	1		200,000		1.8		-	200,000	1.8	-	24-Oct-16
	0.78		956,382		2		58	956,382	2	58	12-Jan-17
	1.2		200,000		2.1		-	200,000	2.1	-	1-Feb-17
	1.01		100,000		2.2		-	100,000	2.2	-	1-Mar-17
	0.65		1,330,542		2.9		229	1,330,542	2.9	229	7-Dec-17
	0.66		594,152		3.3		97	594,152	3.3	97	25-Apr-18
	1.07		100,000		3.6		-	76,000	3.6	-	1-Aug-18
	1.03		965,351		4		-	522,857	4	-	27-Dec-18
	1.44		100,000		4.2		-	54,000	4.2	-	31-Mar-19
	0.88		1,036,776		4.9		-	103,678	4.9	-	12-Dec-19
	1.21		8,468,614		2.6		443	7,023,022	2.2	443
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
				Number		Weighted
				of		average grant
				RSUs		date fair value
						$
	Unvested, December 31, 2011			276,365		2.90
	Granted			703,572		0.92
	Vested			-136,789		2.90
	Forfeited			-16,723		1.68
	Unvested, December 31, 2012			826,425		1.15
	Granted			273,834		1.23
	Vested			-402,581		1.89
	Forfeited			-6,068		0.78
	Unvested, December 31, 2013			691,610		0.90
	Granted			259,192		1.20
	Vested			-527,407		0.74
	Forfeited			-43,960		0.92
	Unvested, December 31, 2014			379,435		0.89
Schedule Of Share-Based Compensation, Shares Authorized Under Restricted Stock Units, By Grant Date
							Aggregate
			Number of		Remaining		Intrinsic
			unvested		life		Value
	Grant date		options		(years)		$
	27-Dec-13		120,243		0.98		102
	12-Dec-14		259,192		1.94		220
			379,435		1.48		322
Schedule Of Share-Based Compensation, Warrants, Activity
				Number		Weighted-
				of		average
				Warrants		exercise price
						$
	Outstanding, December 31, 2011			100,000		1.12
	Granted			50,000		0.93
	Outstanding, December 31, 2012			150,000		1.06
	Granted			9,774,512		1.19
	Cancelled			-1,550,400		1.17
	Outstanding, December 31, 2013			8,374,112		1.19
	Outstanding, December 31, 2014			8,374,112		1.19
Schedule Of Share-based Compensation Shares Authorized Under Warrants Plans by exercise price range
							Aggregate
	Exercise				Remaining		Intrinsic
	price		Number		contractual		Value
	$		of warrants		life (years)		$	Expiry
	0.92		50,000		0.7		-	4-Sep-15
	1.12		100,000		0.8		-	1-Nov-15
	0.93		25,000		1.2		-	5-Mar-16
	1.35		2,354,545		2		-	19-Dec-16
	1.12		4,294,167		3.5		-	24-Jun-18
	1.17		1,550,400		3.6		-	27-Aug-18
			8,374,112		3		-
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
		2014	2013	2012
	Expected warrant life (years)	-	1.5 - 3	1.5
	Expected option life (years)	3.49-3.56	3.41-3.51	3.29 - 3.37
	Expected volatility	61-66%	61-66%	63-78%
	Risk-free interest rate	1.1-1.4%	0.9-1.4%	1.0-1.3%
	Forfeiture rate (warrants)	0.00%	0.00%	0.00%
	Forfeiture rate (options)	4.5-4.7%	4.2-4.4%	4.6-4.8%
	Forfeiture rate (RSUs)	8.10%	7.70%	12.5-22.3%
	Expected dividend rate	0%	0%	0%

Sales_Tables

Sales (Tables)	12 Months Ended
	Dec. 31, 2014
Revenue [Abstract]
Schedule Of Revenue
		Year ended December 31,		Year ended December 31,
		2014		2013
		$		$
	Company A	10,123	34.5%	3,426	45.0%
	Company B	9,199	31.4%	1,555	20.4%
	Company C	7,197	24.5%	-	0.0%
		26,519	90.4%	4,981	65.4%
	Disposal fees	323	1.1%	-	0.0%
	Recognition of gain from sale of deliveries under assignment	2,507	8.5%	2,635	34.6%
		29,349	100.0%	7,616	100.0%

Segmented_Information_Tables

Segmented Information (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment
		December 31, 2014
		United States	Canada	Total
		$	$	$
	Restricted Cash	7,556	-	7,556
	Mineral properties	52,750	-	52,750
	Capital assets	32,993	-	32,993
	Investments	1,090	-	1,090
		94,389	-	94,389
		December 31, 2013
		United States	Canada	Total
		$	$	$
	Restricted Cash	5,055	-	5,055
	Mineral properties	52,213	489	52,702
	Capital assets	35,250	-	35,250
	Investments	1,085	-	1,085
		93,603	489	94,092

Commitments_Tables

Commitments (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases
	Year ended December 31,	$
	2015	200
	2016	200
	2017	100
	2018 and thereafter	-
		500
Summary of Off-Take Sales Agreements
	SUMMARY OF OFF TAKE SALES AGREEMENTS
	Production Year	Total Pounds Uranium Concentrates Contractually Committed
	2015	630,000 pounds
	2016	662,000 pounds
	2017	600,000 pounds
	2018	500,000 pounds
	2019	400,000 pounds
	2020	200,000 pounds

Other_items_not_affecting_cash1

Other items not affecting cash flow (Tables)	12 Months Ended
	Dec. 31, 2014
Noncash Investing and Financing Items [Abstract]
Other Items Not Affecting Cash Flow
		Year ended December 31,
		2014	2013	2012
		$	$	$
	Non-cash financing and investing activities:
	Common shares issued for properties	—	783	—
	Mineral property acquired in asset exchange	—	—	970

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Details) (USD $)	0 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Jan. 01, 2013	Dec. 31, 2013	Dec. 31, 2014
Adjustment to beginning balances due to change in functional currency	$6,161	$6,161
Deferred revenue contract period		2 years
Lost Creek Property
Estimated life			10 years
Maximum | Plant enclosure and equipment
Estimated life			20 years
Minimum | Computer Equipment [Member]
Estimated life			3 years

Cash_Details

Cash (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Cash [Abstract]
Cash on deposit at banks	$431	$296
Money market funds	2,673	1,331
Cash and cash equivalents	$3,104	$1,627	$11,536	$15,854

Accounts_Receivable_Details

Accounts Receivable (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Trade accounts receivable
Trade receivables	$19	$5,729
Other receivables	9	73
Total accounts receivable	28	5,802
Company A [Member]
Trade accounts receivable
Trade receivables		3,895
Company B [Member]
Trade accounts receivable
Trade receivables		1,768
Other Companies [Member]
Trade accounts receivable
Trade receivables	$19	$66

Inventory_Details

Inventory (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Inventory
Inventory, Net, Total	$5,168	$2,053
Inventory Valuation Reserves	0
In Process Inventory [Member]
Inventory
Inventory, Net, Total	2,084	765
Plant Inventory [Member]
Inventory
Inventory, Net, Total	882	1,136
Conversion Facility Inventory [Member]
Inventory
Inventory, Net, Total	$2,202	$152

Restricted_Cash_Details

Restricted Cash (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Restricted Cash
Non-current restricted cash	$7,556	$5,055
Surety Bond [Member]
Restricted Cash
Reclamation bonding requirement	26,537
Certificate of deposit [Member]
Restricted Cash
Non-current restricted cash	100	100
Certificate of deposit [Member] | Collectibility of Receivables [Member]
Restricted Cash
Restricted cash pledged as collateral	100
Money Market Funds [Member]
Restricted Cash
Non-current restricted cash	7,456	4,955
Money Market Funds [Member] | Surety Bond [Member]
Restricted Cash
Restricted cash pledged as collateral	$7,456

Mineral_Properties_rollforward

Mineral Properties rollforward (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Balance at beginning of period	$52,702	$33,501
Acquisition costs	50	10,276
Royalty acquired for common stock		783
Increase in reclamation costs	5,669
Reporting exchange rate adjustment	-6	-36
Property write-offs	-483	-1,430
Functional Currency exchange rate adjustment		-5,274
Amortization	-5,182	-435
Purchase of Pathfinder Mines		15,317
Balance at end of period	52,750	52,702
Canadian Properties [Member]
Balance at beginning of period	489	525
Reporting exchange rate adjustment	-6	-36
Property write-offs	-483
Balance at end of period		489
Lost Creek Property
Balance at beginning of period	23,686	15,505
Acquisition costs	8	10,276
Royalty acquired for common stock		783
Functional Currency exchange rate adjustment		-2,443
Amortization	-5,182	-435
Balance at end of period	18,512	23,686
Other Us Properties [Member]
Balance at beginning of period		17,471
Property write-offs		-1,430
Functional Currency exchange rate adjustment		-2,831
Balance at end of period	13,210	13,210
Path Finder Mines [Member]
Balance at beginning of period	15,317
Acquisition costs	42
Increase in reclamation costs	5,669
Purchase of Pathfinder Mines		15,317
Balance at end of period	$21,028	$15,317

Mineral_Properties_Details

Mineral Properties (Details) (USD $)	12 Months Ended		1 Months Ended		12 Months Ended	1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2013	Jun. 30, 2013	Dec. 31, 2005	Dec. 31, 2013
			item
Stock Issued During Period Value Issued For Royalty Interest		$763,000
Write-off of mineral properties	483,000	1,430,000
Lost Creek Property
Royalty (as a percent)			1.67%
Number Of Mining Claims			20
Stock Issued During Period Shares Issued For Royalty Interest			1,000,000
Stock Issued During Period Value Issued For Royalty Interest			763,000
Mining Claims In LC North LC East or LC West
Royalty (as a percent)	0.00%
South Granite Mountain Project
Write-off of mineral properties				261,000
Mustang Project
Write-off of mineral properties		1,168,000
Nfu Wyoming LLC | Lost Creek Property
Percentage of asset acquired					100.00%
Aggregate consideration					20,000,000
Pathfinder Mines Corporation
Aggregate consideration						6,700,000
Royalty (as a percent)		5.00%				5.00%
Estimated asset reclamation obligation		5,700,000				5,700,000
Deferred tax liabilities		3,300,000				3,300,000
Mineral properties		$15,300,000				$15,300,000

Capital_Assets_Details

Capital Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Capital Assets
Cost	$39,076,000	$38,887,000
Accumulated Depreciation	6,083,000	3,637,000
Net Book Value	32,993,000	35,250,000
Capitalized interest and loan fees	1,300,000
Capitalized depreciation	500,000
Depreciation	7,643,000	537,000	530,000
Rolling stock [Member]
Capital Assets
Cost	3,878,000	3,860,000
Accumulated Depreciation	2,852,000	2,366,000
Net Book Value	1,026,000	1,494,000
Building Enclosures [Member]
Capital Assets
Cost	32,968,000	32,936,000
Accumulated Depreciation	1,927,000	279,000
Net Book Value	31,041,000	32,657,000
Machinery and equipment [Member]
Capital Assets
Cost	992,000	903,000
Accumulated Depreciation	426,000	343,000
Net Book Value	566,000	560,000
Furniture, fixtures and leasehold improvements [Member]
Capital Assets
Cost	119,000	121,000
Accumulated Depreciation	81,000	64,000
Net Book Value	38,000	57,000
Information technology [Member]
Capital Assets
Cost	1,119,000	1,067,000
Accumulated Depreciation	797,000	585,000
Net Book Value	$322,000	$482,000

Equity_Investment_Details

Equity Investment (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2012
Equity Investment
Asset Impairment Charges	$483	$1,430
Bootheel Project Llc [Member]
Equity Investment
Project Expenditure Percentage	25.00%
Equity Method Investment, Ownership Percentage			19.10%
Asset Impairment Charges	$0
Jet Metals | Bootheel Project Llc [Member]
Equity Investment
Project Expenditure Percentage	75.00%

Accounts_Payable_and_Accrued_L2

Accounts Payable and Accrued Liabilities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Payables and Accruals [Abstract]
Accounts payable	$1,503	$1,508
Severance and ad valorem tax payable	1,947	682
Payroll and other taxes	1,082	510
Accounts payable - Capital assets		228
Accounts payable and accrued liabilities	$4,532	$2,928

Notes_Payable_Current_vs_Longt

Notes Payable - Current vs Long-term (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current debt
Long-Term Debt, Current Maturities	$7,374	$5,153
Long term debt
Long-Term Debt, Excluding Current Maturities	33,193	34,000
Sweetwater IDR Bond [Member]
Current debt
Long-Term Debt, Current Maturities	4,124
Long term debt
Long-Term Debt, Excluding Current Maturities	28,881	34,000
RMBAH First Loan Facility [Member]
Current debt
Long-Term Debt, Current Maturities	3,250	5,000
Long term debt
Long-Term Debt, Excluding Current Maturities	4,312
Insurance premium financing [Member]
Current debt
Long-Term Debt, Current Maturities		$153

Notes_Payable_Maturity_table_D

Notes Payable - Maturity table (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Notes Payable
Total	$48,277,000
Sweetwater IDR Bond [Member]
Notes Payable
Principal	33,005,000
Interest	7,052,000
Debt Instrument, Maturity Date	1-Oct-21
RMBAH First Loan Facility [Member]
Notes Payable
Principal	7,562,000
Interest	658,000
Debt Instrument, Maturity Date	31-Mar-16
2015
Notes Payable
Total	9,746,000
2015 | Sweetwater IDR Bond [Member]
Notes Payable
Principal	4,124,000
Interest	1,810,000
2015 | RMBAH First Loan Facility [Member]
Notes Payable
Principal	3,250,000
Interest	562,000
2016
Notes Payable
Total	10,343,000
2016 | Sweetwater IDR Bond [Member]
Notes Payable
Principal	4,367,000
Interest	1,568,000
2016 | RMBAH First Loan Facility [Member]
Notes Payable
Principal	4,312,000
Interest	96,000
2017
Notes Payable
Total	5,934,000
2017 | Sweetwater IDR Bond [Member]
Notes Payable
Principal	4,623,000
Interest	1,311,000
2018
Notes Payable
Total	5,934,000
2018 | Sweetwater IDR Bond [Member]
Notes Payable
Principal	4,895,000
Interest	1,039,000
2019
Notes Payable
Total	5,935,000
2019 | Sweetwater IDR Bond [Member]
Notes Payable
Principal	5,183,000
Interest	752,000
Subsequent Years
Notes Payable
Total	10,385,000
Subsequent Years | Sweetwater IDR Bond [Member]
Notes Payable
Principal	9,813,000
Interest	$572,000

Notes_Payable_Details

Notes Payable (Details)

0 Months Ended

12 Months Ended

0 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

1 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

Dec. 19, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 19, 2013

Dec. 31, 2012

Dec. 31, 2011

13-May-13

Jun. 24, 2013

13-May-13

Sep. 19, 2014

Mar. 14, 2014

Oct. 23, 2013

Jun. 30, 2013

Jun. 24, 2013

Dec. 31, 2014

Sep. 19, 2014

Mar. 14, 2014

Dec. 19, 2013

Jun. 30, 2013

Oct. 23, 2013

Aug. 31, 2013

Aug. 31, 2013

Oct. 15, 2013

Dec. 31, 2014

Jun. 30, 2013

Dec. 31, 2014

Dec. 19, 2013

Oct. 23, 2013

Oct. 23, 2014

Dec. 31, 2014

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Bridge Loan [Member]

Bridge Loan [Member]

Bridge Loan [Member]

RMBAH First Loan Facility [Member]

RMBAH First Loan Facility [Member]

RMBAH First Loan Facility [Member]

RMBAH First Loan Facility [Member]

RMBAH First Loan Facility [Member]

RMBAH First Loan Facility [Member]

RMBAH First Loan Facility [Member]

RMBAH First Loan Facility [Member]

RMBAH First Loan Facility [Member]

RMBAH First Loan Facility [Member]

RMBAH Second Loan Facility [Member]

RMBAH Second Loan Facility [Member]

RMBAH Second Loan Facility [Member]

Sweetwater IDR Bond [Member]

Sweetwater IDR Bond [Member]

Three-month LIBOR

First And Second Loan Facility [Member]

Due Quarterly Commencing From March Thirty One Two Thousand Fourteen [Member]

Due Quarterly Commencing From January One Two Thousand Fourteen [Member]

Due Quarterly Commencing From January One Two Thousand Fifteen [Member]

Due Quarterly Commencing From September Nineteen Two Thousand Fourteen [Member]

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

CAD

USD ($)

USD ($)

CAD

USD ($)

USD ($)

RMBAH First Loan Facility [Member]

USD ($)

RMBAH First Loan Facility [Member]

Sweetwater IDR Bond [Member]

Sweetwater IDR Bond [Member]

RMBAH First Loan Facility [Member]

USD ($)

item

USD ($)

Notes Payable

Proceeds from Issuance of Long-term Debt

$5,000,000

$20,000,000

$15,000,000

$34,000,000

Interest added to variable rate (as a percent)

7.50%

Annual interest rate (as a percent)

7.50%

5.75%

Effective Interest Rate

21.60%

8.75%

7.75%

7.77%

16.10%

Debt Instrument Origination Fee Percentage

4.00%

Maturity Date

31-Jul-13

31-Mar-16

1-Oct-21

Minimum Amounts To Be Obtained For Clearing Debt

6,000,000

Class Of Warrant Or Right Issued Number

2,354,545

4,294,167

3,100,800

Class Of Warrant Or Right, Exercise Price Of Warrants Or Rights

$1.19

$1.19

$1.35

$1.06

$1.12

1.2

1.25

Class Of Warrant Or Right Issued Value

3,100,000

1,100,000

Arrangement Fee

1,200,000

900,000

Arrangement Fee Percentage

6.00%

6.00%

Legal Fees

200,000

100,000

Number of installments

28

Write off of Deferred Debt Issuance Cost

4,032,000

1,622,000

5,654,000

Proceeds from debt financing

5,000,000

75,100,000

3,500,000

1,500,000

Periodic payment amount

7,562,000

33,005,000

1,250,000

810,000

Line of Credit Facility, Remaining Borrowing Capacity

3,500,000

Maximum Borrowing Capacity

$5,000,000

$10,000,000

Warrants Cancelled

1,550,400

Deferred_Revenue_Details

Deferred Revenue (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
	item
Deferred Revenue Disclosure [Abstract]
Number of contracts with delivery obligations	2
Cash payment received	$5.10

Income_taxes_reconciliation_De

Income taxes - reconciliation (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Loss before income taxes	($8,749)	($30,313)	($17,558)
Statutory rate	26.50%	26.50%	26.50%
Expected recovery of income tax	-2,318	-8,033	-4,663
Effect of foreign tax rate differences	-619	-3,247	-1,570
Non-deductable amounts	-106	-108	-412
Effect of changes in enacted future rates	65	-286	-40
Effect of change in foreign exchange rates	186	161	91
Effect of stock based compensation		-159	-7
Change in valuation allowance	$2,952	$11,460	$5,945

Income_taxes_deferred_tax_comp

Income taxes - deferred tax components (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Income Tax Disclosure [Abstract]
Deferred tax assets	$8,074	$8,337	$14,301
Net operating loss carry forwards	42,251	39,432	24,579
Less: valuation allowance	-50,325	-47,769	-38,880
Mineral properties	3,345	3,345
Net deferred tax liability	$3,345	$3,345

Income_taxes_Details

Income taxes (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
UNITED STATES
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	$93,338
CANADA
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	$27,732

Asset_Retirement_and_Reclamati2

Asset Retirement and Reclamation Obligations - rollforward (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Asset Retirement Obligation Rollforward
Beginning of year	$17,279	$957
Liabilities incurred		10,639
Assumed in Pathfinder Mining Corporation purchase		5,656
Change in estimated liability	5,669
Accretion expense	497	27
End of period	$23,445	$17,279

Asset_Retirement_and_Reclamati3

Asset Retirement and Reclamation Obligations (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Change in estimated liability	$5,669,000
Lost Creek Property
Estimated Future Cash Undiscounted Amount	12,100,000
Change in estimated liability	0
Lost Creek Property | Minimum
Discount Rate Of Asset Retirement Obligations	0.30%
Lost Creek Property | Maximum
Discount Rate Of Asset Retirement Obligations	3.30%
Path Finder Mines [Member]
Estimated Future Cash Undiscounted Amount	$12,700,000
Discount Rate Of Asset Retirement Obligations	3.00%

Other_Liabilities_Details

Other Liabilities (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 19, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Liabilities
Class of Warrant or Right, Exercise Price of Warrants or Rights	$1.19	$1.19	$1.35	$1.06	$1.12
Warrants Price Per Share On Nonhedging Derivative Financial Instrument	$1.35
Warrants mark to market adjustment (note 16)	$946
Capital Stock
Other Liabilities
Number of securities called by each unit	1
Warrants
Other Liabilities
Number of securities called by each unit	0.5
Warrants mark to market adjustment (note 16)	$946

Shareholders_Equity_and_Capita2

Shareholders' Equity and Capital Stock - options activity (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Options Rollforward
Outstanding, Beginning Balance	9,273,659	8,511,722	6,413,902
Granted, Options	1,136,776	1,876,670	3,114,207
Exercised, Options	-1,623,139	-377,927	-88,473
Forfeited, Options	-303,612	-31,806	-145,414
Expired, Options	-15,070	-705,000	-782,500
Outstanding Ending Balance, Options	8,468,614	9,273,659	8,511,722
Outstanding, Beginning Balance, Weighted-average exercise price	$1.19	$1.32	$1.75
Granted, Weighted-average exercise price	$0.93	$1.07	$0.87
Exercised, Weighted-average exercise price	$0.83	$0.79	$0.85
Forfeited, Weighted-average exercise price	$1.45	$0.78	$1.99
Expired, Weighted-average exercise price	$0.82	$1.69	$3.25
Outstanding Ending Balance, Weighted-average exercise price	$1.21	$1.19	$1.32

Shareholders_Equity_and_Capita3

Shareholders' Equity and Capital Stock - o/s options (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Outstanding Stock Options
Exercise price	$1.21	$1.19	$1.32	$1.75
Number of options, Outstanding	8,468,614	9,273,659	8,511,722	6,413,902
Weighted- average remaining contractual life (years), Outstanding	2 years 7 months 6 days
Aggregate Intrinsic Value, Outstanding	$443
Number of options, Exercisable	7,023,022
Weighted- average remaining contractual life (years), Exercisable	2 years 2 months 12 days
Aggregate Intrinsic Value, Exercisable	443
Stock Option Exercise Price Range One [Member]
Outstanding Stock Options
Exercise price	$0.70
Number of options, Outstanding	455,595
Weighted- average remaining contractual life (years), Outstanding	2 months 12 days
Aggregate Intrinsic Value, Outstanding	59
Number of options, Exercisable	455,595
Weighted- average remaining contractual life (years), Exercisable	2 months 12 days
Aggregate Intrinsic Value, Exercisable	59
Expiry	5-Mar-15
Stock Option Exercise Price Range Two [Member]
Outstanding Stock Options
Exercise price	$2.47
Number of options, Outstanding	1,227,034
Weighted- average remaining contractual life (years), Outstanding	1 year 1 month 6 days
Number of options, Exercisable	1,227,034
Weighted- average remaining contractual life (years), Exercisable	1 year 1 month 6 days
Expiry	28-Jan-16
Stock Option Exercise Price Range Three [Member]
Outstanding Stock Options
Exercise price	$1.35
Number of options, Outstanding	545,000
Weighted- average remaining contractual life (years), Outstanding	1 year 6 months
Number of options, Exercisable	545,000
Weighted- average remaining contractual life (years), Exercisable	1 year 6 months
Expiry	7-Jul-16
Stock Option Exercise Price Range Four [Member]
Outstanding Stock Options
Exercise price	$1.01
Number of options, Outstanding	657,782
Weighted- average remaining contractual life (years), Outstanding	1 year 8 months 12 days
Number of options, Exercisable	657,782
Weighted- average remaining contractual life (years), Exercisable	1 year 8 months 12 days
Expiry	9-Sep-16
Stock Option Exercise Price Range Five [Member]
Outstanding Stock Options
Exercise price	$1
Number of options, Outstanding	200,000
Weighted- average remaining contractual life (years), Outstanding	1 year 9 months 18 days
Number of options, Exercisable	200,000
Weighted- average remaining contractual life (years), Exercisable	1 year 9 months 18 days
Expiry	24-Oct-16
Stock Option Exercise Price Range Six [Member]
Outstanding Stock Options
Exercise price	$0.78
Number of options, Outstanding	956,382
Weighted- average remaining contractual life (years), Outstanding	2 years
Aggregate Intrinsic Value, Outstanding	58
Number of options, Exercisable	956,382
Weighted- average remaining contractual life (years), Exercisable	2 years
Aggregate Intrinsic Value, Exercisable	58
Expiry	12-Jan-17
Stock Option Exercise Price Range Seven [Member]
Outstanding Stock Options
Exercise price	$1.20
Number of options, Outstanding	200,000
Weighted- average remaining contractual life (years), Outstanding	2 years 1 month 6 days
Number of options, Exercisable	200,000
Weighted- average remaining contractual life (years), Exercisable	2 years 1 month 6 days
Expiry	1-Feb-17
Stock Option Exercise Price Range Eight [Member]
Outstanding Stock Options
Exercise price	$1.01
Number of options, Outstanding	100,000
Weighted- average remaining contractual life (years), Outstanding	2 years 2 months 12 days
Number of options, Exercisable	100,000
Weighted- average remaining contractual life (years), Exercisable	2 years 2 months 12 days
Expiry	1-Mar-17
Stock Option Exercise Price Range Nine [Member]
Outstanding Stock Options
Exercise price	$0.65
Number of options, Outstanding	1,330,542
Weighted- average remaining contractual life (years), Outstanding	2 years 10 months 24 days
Aggregate Intrinsic Value, Outstanding	229
Number of options, Exercisable	1,330,542
Weighted- average remaining contractual life (years), Exercisable	2 years 10 months 24 days
Aggregate Intrinsic Value, Exercisable	229
Expiry	7-Dec-17
Stock Option Exercise Price Range Ten [Member]
Outstanding Stock Options
Exercise price	$0.66
Number of options, Outstanding	594,152
Weighted- average remaining contractual life (years), Outstanding	3 years 3 months 18 days
Aggregate Intrinsic Value, Outstanding	97
Number of options, Exercisable	594,152
Weighted- average remaining contractual life (years), Exercisable	3 years 3 months 18 days
Aggregate Intrinsic Value, Exercisable	$97
Expiry	25-Apr-18
Stock Option Exercise Price Range Eleven [Member]
Outstanding Stock Options
Exercise price	$1.07
Number of options, Outstanding	100,000
Weighted- average remaining contractual life (years), Outstanding	3 years 7 months 6 days
Number of options, Exercisable	76,000
Weighted- average remaining contractual life (years), Exercisable	3 years 7 months 6 days
Expiry	1-Aug-18
Stock Option Exercise Price Range Twelve [Member]
Outstanding Stock Options
Exercise price	$1.03
Number of options, Outstanding	965,351
Weighted- average remaining contractual life (years), Outstanding	4 years
Number of options, Exercisable	522,857
Weighted- average remaining contractual life (years), Exercisable	4 years
Expiry	27-Dec-18
Stock Option Exercise Price Range Thirteen [Member]
Outstanding Stock Options
Exercise price	$1.44
Number of options, Outstanding	100,000
Weighted- average remaining contractual life (years), Outstanding	4 years 2 months 12 days
Number of options, Exercisable	54,000
Weighted- average remaining contractual life (years), Exercisable	4 years 2 months 12 days
Expiry	31-Mar-19
Stock Option Exercise Price Range Fourteen [Member]
Outstanding Stock Options
Exercise price	$0.88
Number of options, Outstanding	1,036,776
Weighted- average remaining contractual life (years), Outstanding	4 years 10 months 24 days
Number of options, Exercisable	103,678
Weighted- average remaining contractual life (years), Exercisable	4 years 10 months 24 days
Expiry	12-Dec-19

Shareholders_Equity_and_Capita4

Shareholders' Equity and Capital Stock - RSU activity (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
RSU Rollforward
Number of RSUs Unvested, Beginning Balance	691,610	826,425	276,365
Granted, RSU	259,192	273,834	703,572
Number of RSUs Vested	-527,407	-402,581	-136,789
Number of RSUs Forfeited	-43,960	-6,068	-16,723
Number of RSUs Unvested, Ending Balance	379,435	691,610	826,425
Number of RSUs Unvested, Beginning Balance, Weighted average grant date fair value	$0.90	$1.15	$2.90
Granted, Weighted average grant date fair value	$1.20	$1.23	$0.92
Vested, Weighted average grant date fair value	$0.74	$1.89	$2.90
Forfeited, Weighted average grant date fair value	$0.92	$0.78	$1.68
Number of RSUs Unvested, Ending Balance, Weighted Average Grant Date Fair Value	$0.89	$0.90	$1.15

Shareholders_Equity_and_Capita5

Shareholders' Equity and Capital Stock - o/s RSUs (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
RSUs
Number of unvested units	379,435	691,610	826,425	276,365
Remaining life (years)	1 year 5 months 23 days
Aggregate Intrinsic Value	$322
Grant Date One [Member]
RSUs
Grant date	27-Dec-13
Number of unvested units	120,243
Remaining life (years)	11 months 23 days
Aggregate Intrinsic Value	102
Grant Date Two [Member]
RSUs
Grant date	12-Dec-14
Number of unvested units	259,192
Remaining life (years)	1 year 11 months 9 days
Aggregate Intrinsic Value	$220

Shareholders_Equity_and_Capita6

Shareholders' Equity and Capital Stock - warrants activity (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 19, 2013
Stockholders' Equity Note [Abstract]
Outstanding Beginning Balance, Warrants	150,000	100,000	8,374,112
Granted, Warrants	9,774,512	50,000
Cancelled, Warrants	-1,550,400
Outstanding Ending Balance, Warrants	8,374,112	150,000	8,374,112
Outstanding Beginning Balance, Weighted-average exercise price	$1.06	$1.12	$1.19	$1.35
Granted, Weighted-average exercise price	1.19	0.93
Cancelled, Weighted-average exercise price	1.17
Outstanding Ending Balance, Weighted-average exercise price	$1.19	$1.06	$1.19	$1.35

Shareholders_Equity_and_Capita7

Shareholders' Equity and Capital Stock - o/s warrants (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 19, 2013	Dec. 31, 2012	Dec. 31, 2011
Class of Warrant or Right
Exercise price	$1.19	$1.19	$1.35	$1.06	$1.12
Number of warrants	8,374,112	8,374,112		150,000	100,000
Remaining contractual life (years)	3 years
Warrants Exercise Price Range One [Member]
Class of Warrant or Right
Exercise price	$0.92
Number of warrants	50,000
Remaining contractual life (years)	8 months 12 days
Expiry	4-Sep-15
Warrants Exercise Price Range Two [Member]
Class of Warrant or Right
Exercise price	$1.12
Number of warrants	100,000
Remaining contractual life (years)	9 months 18 days
Expiry	1-Nov-15
Warrants Exercise Price Range Three [Member]
Class of Warrant or Right
Exercise price	$0.93
Number of warrants	25,000
Remaining contractual life (years)	1 year 2 months 12 days
Expiry	5-Mar-16
Warrants Exercise Price Range Four [Member]
Class of Warrant or Right
Exercise price	$1.35
Number of warrants	2,354,545
Remaining contractual life (years)	2 years
Expiry	19-Dec-16
Warrants Exercise Price Range Five [Member]
Class of Warrant or Right
Exercise price	$1.12
Number of warrants	4,294,167
Remaining contractual life (years)	3 years 6 months
Expiry	24-Jun-18
Warrants Exercise Price Range Six [Member]
Class of Warrant or Right
Exercise price	$1.17
Number of warrants	1,550,400
Remaining contractual life (years)	3 years 7 months 6 days
Expiry	27-Aug-18

Shareholders_Equity_and_Capita8

Shareholders' Equity and Capital Stock - addl information (Details)	0 Months Ended		1 Months Ended	12 Months Ended									12 Months Ended				12 Months Ended	1 Months Ended	12 Months Ended		12 Months Ended
	Dec. 19, 2013	Feb. 23, 2012	Jan. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 19, 2013	Dec. 31, 2012	Feb. 23, 2012	Dec. 31, 2011	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2014	Jan. 31, 2015	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014
	USD ($)	USD ($)		USD ($)	USD ($)	USD ($)	CAD	CAD	USD ($)	CAD	USD ($)	USD ($)	Capital Stock	Capital Stock	Capital Stock	Warrants	In Money Stock Option [Member]	Restricted Stock Units (Rsus) [Member]	Restricted Stock Units (Rsus) [Member]	Restricted Stock Units (Rsus) [Member]	Employee Stock Option [Member]	Employee Stock Option [Member]	Four and One Half Months After Grant [Member]	Nine Months After Grant [Member]	Thirteen and One Half Months After Grant [Member]	Eighteen Months After Date Of Grant [Member]	First Anniversary [Member]	Second Anniversary [Member]
																	USD ($)		USD ($)	Capital Stock	USD ($)	USD ($)
Stockholder's Equity Note [Line Items]
Common Stock Shares Issued In Exchange Of Restricted Shares Units			215,168	182,194	338,451	120,359
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period				1,623,139	377,927	88,473							1,623,139	377,927	88,473
Proceeds from Stock Options Exercised				$1,347,000	$275,000	$75,000															$300,000	$100,000
Stock Issued During Period, Shares, New Issues	4,709,089	17,250,000
Share Price							0.99		$1.10		$1
Payments Of Stock Issuance Costs	200,000	1,000,000		50,000	238,000	1,003,000
Proceeds from Issuance of Private Placement	5,100,000
Stock Issued During Period, Value, New Issues		17,300,000
Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Percentage				10.00%																			22.00%	22.00%	22.00%	24.00%
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Number				8,468,614	9,273,659	8,511,722						6,413,902					3,336,671
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number				7,023,022													3,336,671
Stock based compensation				928,000	1,153,000	2,410,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options																	600,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options																			300,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition																	1 year 1 month 6 days		1 year 7 months 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value				$800,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				259,192	273,834	703,572
RSUs vested but not redeemed (in shares)																			280,529
RSUs redeemed against tax effect (in shares)																		65,361
Number of securities called by each unit													1			0.5				1
Class Of Warrant Or Right Issued Number	2,354,545
Class of Warrant or Right, Exercise Price of Warrants or Rights				$1.19	$1.19	$1.06			$1.35			$1.12
Share-Based Compensation Arrangement By Share-Based Payment Award, Restricted Share Units Vesting Percentage																											50.00%	50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price							0.96	1.2		0.82

Shareholders_Equity_and_Capita9

Shareholders' Equity and Capital Stock - assumptions (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility, Minimum	61.00%	61.00%	63.00%
Expected volatility, Maximum	66.00%	66.00%	78.00%
Risk-free interest rate, Minimum	1.10%	0.90%	1.00%
Risk-free interest rate, Maximum	1.40%	1.40%	1.30%
Expected dividend rate	0.00%	0.00%	0.00%
Restricted Stock Units (Rsus) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeiture rate (as a percent)	8.10%	7.70%
Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected award life (in years)			1 year 6 months
Forfeiture rate (as a percent)	0.00%	0.00%	0.00%
Maximum | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected award life (in years)	3 years 6 months 22 days	3 years 6 months 4 days	3 years 4 months 13 days
Forfeiture rate (as a percent)	4.70%	4.40%	4.80%
Maximum | Restricted Stock Units (Rsus) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeiture rate (as a percent)			22.30%
Maximum | Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected award life (in years)		3 years
Minimum | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected award life (in years)	3 years 5 months 27 days	3 years 4 months 28 days	3 years 3 months 15 days
Forfeiture rate (as a percent)	4.50%	4.20%	4.60%
Minimum | Restricted Stock Units (Rsus) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeiture rate (as a percent)			12.50%
Minimum | Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected award life (in years)	0 years	1 year 6 months

Sales_Details

Sales (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
	item
Sales
Number of Sales Contracts with Delivery Obligations	2
Sales Revenue, Goods, Net	$29,349
Concentration Risk, Percentage	100.00%
Company A [Member]
Sales
Sales Revenue, Goods, Net	10,123
Concentration Risk, Percentage	34.50%
Company B [Member]
Sales
Sales Revenue, Goods, Net	9,199
Concentration Risk, Percentage	31.40%
Company C [Member]
Sales
Sales Revenue, Goods, Net	7,197
Concentration Risk, Percentage	24.50%
Company A,B and C [Member]
Sales
Sales Revenue, Goods, Net	2,507
Concentration Risk, Percentage	8.50%
Disposal fees	$323
Disposal Fees Concentration Risk Percentage	1.10%

Financial_instruments_Details

Financial instruments (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Credit Concentration Risk
Financial Instruments
Cash, insured amount	0.9
Cash, uninsured amount	9.8
Credit Availability Concentration Risk
Financial Instruments
Accounts Payable, Trade, Current	3
Interest Rate Risk
Financial Instruments
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Discount Rate	0.6
Minimum | Credit Concentration Risk
Financial Instruments
Investment Interest Rate	0.18%
Minimum | Credit Availability Concentration Risk
Financial Instruments
Debt Instrument, Term	0 years
Maximum | Credit Concentration Risk
Financial Instruments
Investment Interest Rate	0.40%
Maximum | Credit Availability Concentration Risk
Financial Instruments
Debt Instrument, Term	7 years
Maximum | Currency Risk
Financial Instruments
Foreign Currency Cash And Cash Equivalents At Carrying Value	0.1

Segment_Information_Details

Segment Information (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	item
Number of Reportable Segments	1
Restricted Cash	$7,556	$5,055
Mineral properties	52,750	52,702	33,501
Capital assets	32,993	35,250
Equity investment	1,090	1,085
Non-current assets	94,389	94,092
UNITED STATES
Restricted Cash	7,556	5,055
Mineral properties	52,750	52,213
Capital assets	32,993	35,250
Equity investment	1,090	1,085
Non-current assets	94,389	93,603
CANADA
Mineral properties		489
Non-current assets		$489

Commitments_Lease_table_Detail

Commitments - Lease table (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating leases
2015	$200,000
2016	200,000
2017	100,000
Minimum annual lease payments	500,000
Operating Leases, Rent Expense	200,000	200,000	100,000
Contingency Cost	$200

Commitments_Details

Commitments (Details)	12 Months Ended
	Dec. 31, 2014
	lb
	item
Off-Take Sales Agreements
Number of off-take sales agreements	9
2015 Commitment (in pounds)	630,000
2016 Commitment (in pounds)	662,000
2017 Commitment (in pounds)	600,000
2018 Commitment (in pounds)	500,000
2019 Commitment (in pounds)	400,000
2020 Commitment (in pounds)	200,000
Off-Take Sales Agreement Entered February 2015 [Member]
Off-Take Sales Agreements
Annual delivery commitment (in pounds)	200,000
Maximum | Off-Take Sales Agreement Entered March 2014 [Member]
Off-Take Sales Agreements
Annual delivery commitment (in pounds)	250,000
Minimum | Off-Take Sales Agreement Entered March 2014 [Member]
Off-Take Sales Agreements
Annual delivery commitment (in pounds)	150,000

Other_items_not_affecting_cash2

Other items not affecting cash flow (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Non-cash financing and investing activities:
Common shares issued for properties	$783
Mineral property acquired in asset exchange		$970