Condensed Consolidated Statements of Cash Flows and Supplemental Cash Flow Information (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating Activities:
Net loss	$ (12,624)	$ (8,656)
Reconciliation of net loss to cash used in operations:
Accretion of asset retirement obligations	360	337
Amortization of debt discount	1,355	1,354
Amortization of convertible loan establishment fee	75	75
Loss on sale of available-for-sale securities	116
Common stock issued as payment for commitment fees	333
Impairment of uranium properties	534
Costs incurred for restoration and reclamation activities	(54)	(129)
Depreciation and amortization	188	252
Stock based compensation expense	545	794
Gain on disposal of uranium properties		(4,268)
Gain on disposal of property, plant and equipment		(18)
Effect of changes in operating working capital items:
(Increase)/decrease in receivables	47	(1)
(Increase)/decrease in prepaid and other current assets	101	(96)
Increase/(decrease) in payables, accrued liabilities and deferred credits	(830)	1,875
Net Cash Used In Operating Activities	(9,854)	(8,481)
Cash Flows From Investing Activities:
Proceeds from the sale of investments	247
Increase in notes receivable		(1,283)
Decrease in restricted cash	57
Purchases of equipment		(12)
Proceeds from disposal of property, plant and equipment		2,518
Net Cash Provided By Investing Activities	304	1,223
Cash Flows From Financing Activities:
Payments on borrowings		(4)
Issuance of common stock, net	12,511	5,654
Payment of minimum withholding taxes on net share settlements of equity awards		(126)
Net Cash Provided By Financing Activities	12,511	5,524
Net increase/(decrease) in cash and cash equivalents	2,961	(1,734)
Cash and cash equivalents, beginning of period	865	5,570
Cash and Cash Equivalents, End of Period	3,826	3,836
Cash Paid During the Period For:
Interest	486
Supplemental Non-Cash Information With Respect to Investing and Financing Activities:
Common stock issued for settlement of accounts payable	834
Common stock issued for payment of convertible loan interest and fees	242	541
Common stock issued for payment of commitment fees	$ 523