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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income Statement [Abstract]    
Revenue $ 21 $ 5
Operating expenses:    
Research and development (including amounts with related parties) 13,234 12,598
Selling, general and administrative (including amounts with related parties) 5,373 5,742
Total operating expenses 18,607 18,340
Loss from operations (18,586) (18,335)
Other income (expense):    
Investment income, net 178 370
Interest expense (7) (3)
Other income, net (including amounts with related parties) 32 47
Total other income 203 414
Loss before income taxes (18,383) (17,921)
Income tax benefit 0 36
Net loss $ (18,383) $ (17,885)
Net loss per share:    
Basic and diluted $ (0.19) $ (0.22)
Weighted-average number of shares during the period:    
Basic and diluted 98,472,641 81,261,302