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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]        
Revenues $ 3,500 $ 4,819 $ 6,262 $ 4,819
Operating expenses        
Research and development 3,184 3,164 8,471 5,340
General and administrative 1,490 3,128 3,702 5,115
Impairment of goodwill 6,474 7,268
Total operating expenses 4,674 12,766 12,173 17,723
Loss from operations (1,174) (7,947) (5,911) (12,904)
Other income (expense)        
Interest income 13 102 65 106
Settlement expense (200)
Other income/(expense), net (9) 1 (10) (2)
Net loss $ (1,170) $ (7,844) $ (5,856) $ (13,000)
Net loss per share, basic and diluted $ (0.05) $ (0.41) $ (0.26) $ (0.99)
Weighted average shares of common stock used to compute basic and diluted net loss per share 24,376,571 19,216,172 22,423,014 13,114,242