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Consolidated Statements of Cash Flows and Supplemental Cash Flow Information - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Operating Activities:    
Net loss $ (19,288) $ (19,605)
Reconciliation of net loss to cash used in operations:    
Accretion of asset retirement obligations 1,039 480
Decrease in restoration and reclamation accrual (97) (54)
Amortization of debt discount 30 1,839
Amortization of convertible loan establishment fee 100
Amortization of note receivable discount (744)
Amortization of non-cash investor relations fee 250
Depreciation and amortization 142 247
Stock compensation expense 101 195
Common stock issued as payment of commitment fees 333
Common stock issued as payment of accounts payable 25
Common stock issued for lithium property acquisition 278
Impairment of uranium properties 11,436 1,673
Gain on disposal of fixed assets (1)
Gain on sale of uranium properties (4,963)
Loss on extinguishment of convertible debt 39 3,322
Loss on sale of marketable securities 116
Effect of changes in operating working capital items:    
Decrease in receivables 5 89
Decrease in prepaid and other current assets (22) 53
Increase/(decrease) in payables, accrued liabilities and deferred credits 445 (1,375)
Net Cash Used In Operating Activities (11,603) (12,309)
Cash Flows From Investing Activities:    
Purchases of equipment (100) (26)
Proceeds from disposal of mineral properties, net 1,950
Proceeds from disposal of property, plant and equipment 1
Proceeds from the sale of other short-term assets 247
Note advances for Alabama Graphite Corp. acquisition (833)
Net Cash Provided By Investing Activities 1,018 221
Cash Flows From Financing Activities:    
Payments on borrowings (5,500)
Issuance of common stock, net 16,535 14,472
Payment of minimum withholding taxes on net share settlements of equity awards (1) (2)
Net Cash Provided By Financing Activities 11,034 14,470
Net increase in cash, cash equivalents and restricted cash 449 2,382
Cash, Cash Equivalents and Restricted Cash, Beginning of Period 7,273 4,891
Cash, Cash Equivalents and Restricted Cash, End of Period 7,722 7,273
Cash Paid During the Period for:    
Interest 130 600
Supplemental Non-Cash Information with Respect to Investing and Financing Activities:    
Common stock issued for payment of accounts payable 325 850
Common stock issued for payment of loan interest 304
Common stock issued for payment of commitment fees 1,214 523
Total Non-Cash Investing and Financing Activities for the Period $ 1,539 $ 1,677