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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Operating expenses: |  |  |  |
Research and development | $ 1,720 | $ 1,068 | $ 5,116 | $ 5,079
General and administrative | 1,341 | 3,222 | 10,130 | 9,350
Total operating expenses and operating loss | (3,061) | (4,290) | (15,246) | (14,429)
Non-operating income (expense): |  |  |  |
Change in fair value of warrant liability | 2,241 | 0 | 5,340 | 0
Change in fair value of contingent consideration | (162) | 0 | (4,025) | 0
Loss on settlement of liability-classified warrants | 0 | 0 | (727) | 0
Gain on extinguishment of debt | 766 | 0 | 766 | 0
Interest expense, net | (74) | (102) | (292) | (360)
Total non-operating income (expense), net | 2,771 | (102) | 1,062 | (360)
Loss before income taxes | (290) | (4,392) | (14,184) | (14,789)
Income tax expense | 0 | 63 | 163 | 180
Net loss | (290) | (4,455) | (14,347) | (14,969)
Deemed dividend arising from beneficial conversion feature of convertible preferred stock | 0 | 0 | (4,436) | 0
Deemed dividend arising from the issuance of common stock to Series A convertible preferred stockholders under most favored nation provision | (8,654) | 0 | (8,654) | 0
Impact of anti-dilution protection on liability-classified warrants | (491) | 0 | (491) | 0
Net loss attributable to common stockholders | $ (9,435) | $ (4,455) | $ (27,928) | $ (14,969)
Per share information: |  |  |  |
Net loss per common share attributable to common stockholders, basic and diluted (in dollars per share) | $ (0.53) | $ (2.27) | $ (2.75) | $ (4.56)
Weighted-average common shares outstanding, basic and diluted (in shares) | 17,635,671 | 1,962,822 | 10,161,153 | 3,284,351

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