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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Statement [Abstract]        
Royalty revenue $ 473   $ 473  
Revenue from Contract with Customer, Product and Service [Extensible List] us-gaap:RoyaltyMember us-gaap:RoyaltyMember us-gaap:RoyaltyMember us-gaap:RoyaltyMember
Operating expenses:        
Research and development $ (4,440) $ (6,125) $ (8,446) $ (12,759)
General and administrative (2,840) (4,279) (6,456) (8,807)
Total operating expenses: (7,280) (10,404) (14,902) (21,566)
Other income (expense), net 4 (436) (271) (1,015)
Loss on extinguishment of debt     (2,104)  
Net loss from continuing operations (6,803) (10,840) (16,804) (22,581)
Discontinued operations:        
Income (loss) from discontinued operations   (2,492) 12,898 (2,769)
Net income (loss) $ (6,803) $ (13,332) $ (3,906) $ (25,350)
Net loss from continuing operations per share $ (2.10) $ (3.37) $ (5.14) $ (8.69)
Net income (loss) from discontinued operations per share   (0.77) 3.95 (1.07)
Basic and diluted net loss per basic share $ (2.10) $ (4.14) $ (1.19) $ (9.76)
Weighted-average shares used to compute per share calculations 3,232,811 3,221,074 3,269,410 2,598,552