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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014
Net loss from continuing operations | $ (28,150) | $ (22,017)
Adjustment to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization expense | 304 | 340
Non-cash stock-based compensation | 1,334 | 3,878
Change in fair value of common stock warrants | 982 | (13,174)
Change in fair value of contingent consideration | (69) | 59
Changes in operating assets and liabilities: |  |
Prepaid expenses and other assets | (26) | (348)
Accounts payable | (648) | 54
Accrued expenses and other current liabilities | (1,556) | 2,465
Net cash used in continuing operating activities | (27,829) | (28,743)
Net loss from discontinued operations | 16,074 | 6,633
Impairment of assets held for sale | 8,071 | 0
Changes in operating assets and liabilities attributable to discontinued operations | 2,956 | 3,241
Net cash used in discontinued operating activities | (5,047) | (3,392)
Net cash used in operating activities | (32,876) | (32,135)
Cash flows from investing activities: |  |
Change in restricted cash | (201) |
Cash paid for acquisition of GALE-401 rights | 0 | (2,315)
Cash paid for purchase of equipment and furnishings | (81) | (48)
Net cash used in continuing investing activities | (282) | (2,363)
Net cash used in discontinued investing activities | (534) | (3,056)
Net cash used in investing activities | (816) | (5,419)
Cash flows from financing activities: |  |
Net proceeds from issuance of common stock | 47,416 | 0
Net proceeds from exercise of stock options | 31 | 4,342
Proceeds from exercise of warrants | 0 | 10,717
Proceeds from common stock issued in connection with ESPP | 309 | 263
Principle payments on long-term debt | (2,902) | (908)
Net cash provided by financing activities | 44,854 | 14,414
Net increase (decrease) in cash and cash equivalents | 11,162 | (23,140)
Cash and cash equivalents at the beginning of period | 23,650 | 47,787
Cash and cash equivalents at end of period | 34,812 | 24,647
Supplemental disclosure of cash flow information: |  |
Cash received during the periods for interest | 12 | 13
Cash paid during the periods for interest | 437 | 632
Supplemental disclosure of non-cash investing and financing activities: |  |
Fair value of warrants issued in connection with common stock recorded as cost of equity | $ 10,296 | 27,026
Reclassification of warrant liabilities upon exercise |  | $ (27,020)

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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + 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 (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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