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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net loss $ (5,696) $ (2,871)
Adjustments to reconcile net loss for the period to net cash used in operations:    
Depreciation and amortization 26 240
Stock-based compensation 467 584
(Gain)/loss on other investments 1,717 (2,028)
Change in working capital account items:    
Other current assets 89 389
Provision for environmental liability (2)  
Accounts payable, accrued liabilities and other 8 (1,309)
Net cash used in operating activities (3,391) (4,995)
Cash flows from investing activities:    
Proceeds from sales of marketable securities   64
Disposition of short-term investments, net of acquisitions 1,988 6,166
Additions to plant and equipment (40) (45)
Proceeds from option/sale agreements, net 1,667  
Net cash provided by investing activities 3,615 6,185
Cash flows from financing activities:    
Payment of taxes from withheld shares (46) (39)
Proceeds from exercise of stock options 66 16
Net cash provided by / (used in) financing activities 20 (23)
Net increase in cash and cash equivalents 244 1,167
Cash and cash equivalents, beginning of period 1,071 1,431
Cash and cash equivalents, end of period $ 1,315 $ 2,598