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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement of Cash Flows [Abstract] |  |  |
Net income (loss) | $ 64,009 | $ (5,062) | $ (3,950)
Adjustments to reconcile net income (loss) to net cash used in operating activities: |  |  |
Gain on sale of the Core Business, net of tax | 68,404 | 0 | 0
Depreciation and amortization | 669 | 696 | 734
Gain on disposal of property and equipment, net | 0 | 5 | 21
Stock based compensation | 1,525 | 871 | 809
Change in fair value of derivative liabilities | (20) | (183) | (64)
Unrealized gain on short term investments | 247 | 0 | 0
Provision for allowance for doubtful accounts | 224 | 179 | 84
Provision for (benefit from) deferred taxes | (368) | (196) | 25
Changes in current assets and liabilities, net of effect of disposition: |  |  |
Trade receivables | (382) | (303) | (1,894)
Prepaid expenses | (707) | (83) | 103
Inventories | (881) | (368) | (201)
Deposits and other assets | 45 | 53 | 341
Accounts payable | (224) | (23) | 392
Accrued severance and related | (307) | 1,242 | 0
Accrued and other liabilities | (15,943) | (532) | 763
Net cash used in operating activities | (21,011) | (3,704) | (2,837)
Cash flows (used in) from investing activities |  |  |
Purchases of property and equipment | (363) | (624) | (286)
Proceeds from the disposition of Core business | 91,095 | 0 | 0
Purchases of marketable securities | (87,189) | 0 | 0
Proceeds from marketable securities | 25,758 | 0 | 0
Net cash (used in) provided by investing activities | 29,301 | (624) | (286)
Cash flows from financing activities |  |  |
Proceeds from stock options/warrants exercised | 202 | 0 | 124
Repayment of mortgage note payable | (2,694) | (239) | (240)
Proceeds from issuance of common shares, net | 0 | 0 | 5,830
Net cash (used in) provided by financing activities | (2,492) | (239) | 5,714
Net change in cash, cash equivalents and restricted cash | 5,798 | (4,567) | 2,591
Cash, cash equivalents and restricted cash, beginning of period | 10,668 | 15,235 | 12,644
Cash, cash equivalents and restricted cash, end of period | 16,466 | 10,668 | 15,235
Cash paid for: |  |  |
Interest | 104 | 136 | 158
Income taxes | 13,283 | 32 | 27
Non cash investing activities: |  |  |
Cashless exercise of stock options/warrants | $ 3,237 | $ 557 | $ 698

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- Definition The fair value of stock issued in noncash financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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