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Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Consolidated Statements of Operations (Unaudited) [Abstract]        
Revenue $ 0 $ 0 $ 0 $ 0
Operating expenses:        
Research and development 14,829 13,065 43,955 29,590
General and administrative 4,336 2,268 12,547 15,021
Total operating expenses 19,165 15,333 56,502 44,611
Loss from operations (19,165) (15,333) (56,502) (44,611)
Research and development incentives 0 0 250 186
Interest expense (1,466) (1,176) (4,615) (4,010)
Interest and other income, net 979 420 2,522 1,236
Accretion of discount on investments 368 0 930 0
Net loss $ (19,284) $ (16,089) $ (57,415) $ (47,199)
Net loss per share attributable to common stockholders - basic and diluted (in dollars per share) $ (0.38) $ (0.40) $ (1.19) $ (1.22)
Weighted-average common shares outstanding - basic and diluted (in shares) 50,364,649 39,900,551 48,270,771 38,598,304