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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net loss	$ (8,194)	$ (4,933)
Adjustments to reconcile net loss for the period to net cash used in operations:
Depreciation and amortization	40	252
Stock-based compensation	615	855
(Gain)/loss on other investments	1,951	(1,754)
Change in working capital account items:
Other current assets	217	411
Provision for environmental liability	(2)
Accounts payable, accrued liabilities and other	183	(1,178)
Net cash used in operating activities	(5,190)	(6,347)
Cash flows from investing activities:
Proceeds from sales of marketable securities		156
Disposition of short-term investments, net of acquisitions	3,886	6,115
Additions to plant and equipment	(40)	(86)
Proceeds from option/sale agreements, net	1,667
Net cash provided by investing activities	5,513	6,185
Cash flows from financing activities:
Payment of taxes from withheld shares	(76)	(122)
Proceeds from exercise of stock options	66	16
Net cash provided by / (used in) financing activities	(10)	(106)
Net increase in cash and cash equivalents	313	(268)
Cash and cash equivalents, beginning of period	1,071	1,431
Cash and cash equivalents, end of period	$ 1,384	$ 1,163

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