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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Cash flows from operating activities: |  |  |
Net income/(loss) for the period | $ (3,133) | $ 1,011 | $ (18,926)
Adjustments to reconcile net income/(loss) for the period to net provided by/(cash used) in operations: |  |  |
Depreciation and amortization | 618 | 694 | 863
Stock-based compensation | 645 | 817 | 1,126
Gain on disposal of marketable securities |  | (12) | (24)
Write-down of marketable securities and long-term investments |  |  | 138
Gain on disposal of mineral property | (150) | (1,958) |
Write-down of value-added tax receivable |  | 572 |
Write-down of non-current assets |  |  | 5,563
(Gain)/loss on other investments | (3,196) | 1,593 | 4,112
Other non-cash items |  |  | (162)
Change in working capital account items: |  |  |
Other current assets | (88) | 316 | 492
Provision for environmental liability | 350 |  |
Accounts payable, accrued liabilities and other | (70) | (24) | (240)
Net cash provided by/(used in) operating activities | (5,024) | 3,009 | (7,058)
Cash flows from investing activities: |  |  |
Proceeds from sales of marketable securities |  | 41 | 60
Proceeds from sale of other investments, net |  | 2,772 | 10,560
Acquisition of short-term investments, net of dispositions | (9,985) | (11,990) |
Additions to plant and equipment | (37) | (134) | (7)
Proceeds from option/sales agreements, net | 150 | 3,490 | 1,028
Net cash provided by/(used) in investing activities | (9,872) | (5,821) | 11,641
Cash flows from financing activities: |  |  |
Proceeds from equity financings, net | 15,883 |  |
Repayment of debt |  |  | (6,344)
Proceeds from exercise of stock options | 15 |  |
Net cash provided by/(used in) financing activities | 15,898 |  | (6,344)
Increase/(decrease) in cash and cash equivalents | 1,002 | (2,812) | (1,761)
Cash and cash equivalents, beginning of period | 902 | 3,714 | 5,475
Cash and cash equivalents, end of period | $ 1,904 | $ 902 | $ 3,714

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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