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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement [Abstract]        
Revenues $ 0 $ 0 $ 0 $ 0
Operating expenses:        
Research and development 2,099 4,231 5,031 5,469
General and administrative 1,484 1,220 3,075 2,611
Depreciation and amortization 49 7 97 15
Total operating expenses 3,632 5,458 8,203 8,095
Loss from operations (3,632) (5,458) (8,203) (8,095)
Other income (expense):        
Gain from change in fair value of warrant liability 2,407 331 2,936 1,040
Other expense 0 (1) 0 (1)
Interest income, net 4 3 5 4
Net loss $ (1,221) $ (5,125) $ (5,262) $ (7,052)
Net loss per common share - basic and diluted (usd per share) $ (0.03) $ (0.20) $ (0.15) $ (0.29)
Basic and diluted weighted average common shares outstanding (shares) 42,393,031 25,888,931 35,765,790 24,617,372
Other comprehensive income (loss):        
Foreign currency translation $ (2) $ 6 $ (13) $ 6
Comprehensive loss $ (1,223) $ (5,119) $ (5,275) $ (7,046)