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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Cash flows from operating activities |  |
Net loss | $ (13,900) | $ 67,967
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Gain on sale of the Core Business, net of tax | 0 | (69,072)
Depreciation and amortization | 510 | 429
Provision for inventory obsolescence | 115 | 0
Unrealized gain on foreign currency remeasurement | (12) | 0
Loss on disposal of property and equipment | 19 | 0
Stock based compensation | 2,594 | 1,238
Change in fair value of derivative liabilities | 0 | (20)
Net, non cash lease expense | 2 |
Realized and unrealized gains on short term investments | (164) | (47)
Provision for allowance for doubtful accounts | (94) | 123
Benefit of deferred taxes | 0 | (368)
Changes in operating assets and liabilities: |  |
Trade receivables | (2,580) | 654
Prepaid expenses | (596) | (188)
Inventories | (2,463) | (1,706)
Deposits and other assets | (131) | (9)
Accounts payable | 50 | 765
Accrued and other liabilities | 1,556 | (2,601)
Net cash used in operating activities | (15,094) | (2,835)
Cash flows from investing activities |  |
Purchases of property and equipment | (1,076) | (203)
Purchases of marketable securities | (18,884) | (55,433)
Proceeds from maturities of marketable securities | 80,726 | 0
Proceeds from the disposition of Core business | 0 | 91,095
Net cash provided by investing activities | 60,766 | 35,459
Cash flows from financing activities |  |
Proceeds from stock options | 154 | 65
Repayment of finance lease liabilities | (2) | 0
Repayment of mortgage note payable | 0 | (2,694)
Net cash provided by (used in) financing activities | 152 | (2,629)
Effect of foreign currency translation on cash | (18) | 0
Net change in cash, cash equivalents and restricted cash | 45,806 | 29,995
Cash, cash equivalents and restricted cash, beginning of period | 16,466 | 10,668
Cash, cash equivalents and restricted cash, end of period | 62,272 | 40,663
Cash paid for: |  |
Interest | 0 | 102
Non cash financing activities: |  |
Cashless exercise of stock options/warrants | $ 957 | $ 3,133

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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References No definition available. + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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