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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Costs and expenses: |  |  |  |
Research and development | $ 2,044 | $ 6,175 | $ 4,406 | $ 11,618
General and administrative | 2,867 | 3,117 | 5,593 | 6,642
Total operating expenses | 4,911 | 9,292 | 9,999 | 18,260
Operating loss | (4,911) | (9,292) | (9,999) | (18,260)
Other income (expense): |  |  |  |
Litigation settlements | (1,300) | (1,800) | (1,300) | (1,800)
Change in fair value of warrants potentially settleable in cash | (185) | 14,392 | 3,707 | 10,520
Interest expense, net | (687) | (519) | (1,660) | (611)
Change in fair value of the contingent purchase price liability | (19) | 5,497 | (132) | 5,327
Total non-operating income (expense), net | (2,191) | 17,570 | 615 | 13,436
Income (loss) from continuing operations | (7,102) | 8,278 | (9,384) | (4,824)
Loss from discontinued operations | (1,302) | (2,889) | (10,738) | (6,280)
Net income (loss) | $ (8,404) | $ 5,389 | $ (20,122) | $ (11,104)
Net loss per common share: |  |  |  |
Basic net income (loss) per share, continuing operations (in dollars per share) | $ (0.19) | $ 0.91 | $ (0.29) | $ (0.13)
Basic net loss per share, discontinued operations (in dollars per share) | (0.03) | (0.32) | (0.34) | (0.17)
Basic net income (loss) per share (in dollars per share) | $ (0.22) | $ 0.59 | $ (0.63) | $ (0.30)
Weighted-average common shares outstanding, basic (in shares) | 37,421,273 | 9,101,730 | 31,944,243 | 9,035,173
Net income (loss) per common share, diluted: |  |  |  |
Diluted net income (loss) per share, continuing operations (in dollars per share) | $ (0.19) | $ 0.90 | $ (0.29) | $ (0.13)
Diluted net loss per share, discontinued operations (in dollars per share) | (0.03) | (0.32) | (0.34) | (0.17)
Diluted net income (loss) per share (in dollars per share) | $ (0.22) | $ 0.58 | $ (0.63) | $ (0.30)
Weighted-average common shares outstanding, diluted (in shares) | 37,421,273 | 9,273,867 | 31,944,243 | 9,035,173

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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