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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:    
Net loss $ (9,386) $ (8,714)
Adjustments to reconcile net loss for the period to net cash used in operations:    
Depreciation and amortization 52 983
Stock-based compensation 765 982
Write-down of plant and equipment   1,000
Other gains and losses (134)  
(Gain)/loss on other investments 1,643 (1,716)
Change in working capital account items:    
Other current assets (31) 84
Provision for environmental liability (2)  
Accounts payable, accrued liabilities and other 40 (1,186)
Net cash used in operating activities (7,053) (8,567)
Cash flows from investing activities:    
Proceeds from sales of marketable securities 413 170
Disposition of short-term investments, net of acquisitions 3,737 8,147
Additions to plant and equipment (40) (63)
Proceeds from option/sale agreements, net 3,267 50
Net cash provided by investing activities 7,377 8,304
Cash flows from financing activities:    
Payment of taxes from withheld shares (76) (122)
Option Amendment   (61)
Proceeds from exercise of stock options 89 86
Net cash provided by / (used in) financing activities 13 (97)
Net increase (decrease) in cash and cash equivalents 337 (360)
Cash and cash equivalents, beginning of period 1,071 1,431
Cash and cash equivalents, end of period $ 1,408 $ 1,071