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Condensed Consolidated Statements of Cash Flows and Supplemental Cash Flow Information (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating Activities:    
Net (loss)/income $ (3,419) $ 1,845
Reconciliation of net (loss) income to cash used in operations:    
Accretion of asset retirement obligations 134 132
Amortization of debt discount 30
Amortization of notes receivable discount (168) (175)
Loss on extinguishment of convertible debt 39
Loss on sale of marketable securities 93
Costs incurred for restoration and reclamation activities (142) (14)
Depreciation and amortization 34 38
Stock compensation expense 81 22
Gain on disposal of uranium properties (4,422)
Amortization of non-cash investor relations fees 25
Effect of changes in operating working capital items:    
Increase in receivables (5)
Increase in prepaid and other current assets (14) (151)
Decrease in payables, accrued liabilities and deferred credits (295) (651)
Net Cash Used In Operating Activities (3,696) (3,287)
Cash Flows From Investing Activities:    
Proceeds from the sale of securities, net 475
Proceeds from disposal of property, plant and equipment 1,950
Proceeds from note receivable 750
Note advances for Alabama Graphite Corp. acquisition (597)
Net Cash Provided By Investing Activities 628 1,950
Cash Flows From Financing Activities:    
Payments on borrowings (5,500)
Issuance of common stock, net 651 13,388
Payment of minimum withholding taxes on net share settlements of equity awards (1)
Net Cash Provided By Financing Activities 651 7,887
Net (decrease)/increase in cash, cash equivalents and restricted cash (2,417) 6,550
Cash, cash equivalents and restricted cash, beginning of period 7,722 7,273
Cash, Cash Equivalents and Restricted Cash, End of Period 5,305 13,823
Cash paid during the period for:    
Interest 3 227
Supplemental Non-Cash Information for Investing and Financing Activities:    
Securities received for payment of notes receivable - Laramide 750
Securities received for asset disposal - Laramide $ 568