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Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Consolidated Statements of Operations (Unaudited) [Abstract]        
Revenue $ 0 $ 0 $ 0 $ 0
Operating expenses:        
Research and development 13,989 10,772 29,126 16,525
General and administrative 4,403 4,100 8,211 12,752
Total operating expenses 18,392 14,872 37,337 29,277
Loss from operations (18,392) (14,872) (37,337) (29,277)
Research and development incentives 0 0 250 186
Interest expense (1,544) (1,363) (3,148) (2,834)
Interest and other income, net 1,000 468 1,601 815
Accretion of discount on investments 256 0 503 0
Net loss $ (18,680) $ (15,767) $ (38,131) $ (31,110)
Net loss per share attributable to common stockholders - basic and diluted (in dollars per share) $ (0.38) $ (0.40) $ (0.81) $ (0.82)
Weighted-average common shares outstanding - basic and diluted (in shares) 49,267,247 39,483,006 47,206,480 37,954,972