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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