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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

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