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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities: |  |
Net loss for the period | $ (8,714) | $ (12,035)
Adjustments to reconcile net loss for the period to net cash used in operations: |  |
Depreciation and amortization | 983 | 655
Stock-based compensation | 982 | 874
Gain on disposal of mineral property |  | (358)
Write-down of plant and equipment | 1,000 |
(Gain)/loss on other investments | (1,716) | 1,248
Change in working capital account items: |  |
Other current assets | 84 | (160)
Provision for environmental liability |  | (108)
Accounts payable, accrued liabilities and other | (1,186) | 1,083
Net cash used in operating activities | (8,567) | (8,801)
Cash flows from investing activities: |  |
Proceeds from sales of marketable securities | 170 |
Disposition of short-term investments, net of acquisitions | 8,147 | 6,831
Additions to plant and equipment | (63) |
Proceeds from option/sale agreements, net | 50 | 1,761
Net cash provided by investing activities | 8,304 | 8,592
Cash flows from financing activities: |  |
Payment of taxes from withheld shares | (122) | (264)
Option Amendment | (61) |
Proceeds from exercise of stock options | 86 |
Net cash used in financing activities | (97) | (264)
Net decrease in cash and cash equivalents | (360) | (473)
Cash and cash equivalents, beginning of period | 1,431 | 1,904
Cash and cash equivalents, end of period | $ 1,071 | $ 1,431

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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- Definition Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 + Details
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