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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net loss for the period $ (2,871) $ (5,529)
Adjustments to reconcile net loss for the period to net cash used in operations:    
Depreciation and amortization 240 318
Stock-based compensation 584 427
Gain on disposal of mineral property   (358)
(Gain)/loss on other investments (2,028) 780
Change in working capital account items:    
Other current assets 389 54
Accounts payable, accrued liabilities and other (1,309) 269
Net cash used in operating activities (4,995) (4,039)
Cash flows from investing activities:    
Proceeds from sales of marketable securities 64  
Disposition of short-term investments, net of acquisitions 6,166 3,843
Additions to plant and equipment (45)  
Proceeds from option/sales agreements, net   358
Net cash provided by investing activities 6,185 4,201
Cash flows from financing activities:    
Payment of taxes from withheld shares (39)  
Proceeds from exercise of stock options 16  
Net cash used in financing activities (23)  
Net increase in cash and cash equivalents 1,167 162
Cash and cash equivalents, beginning of period 1,431 1,904
Cash and cash equivalents, end of period $ 2,598 $ 2,066