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STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Operating expenses:    
Research and development $ 30,042 $ 21,104
Research and development - licenses acquired 6,273 3,360
General and administrative 9,570 6,759
Total operating expenses 45,885 31,223
Loss from operations (45,885) (31,223)
Other income (expense)    
Interest income 1,263 569
Interest expense (1,767) (8)
Total other income (expense) (504) 561
Net Loss $ (46,389) $ (30,662)
Net loss per common share outstanding, basic and diluted $ (1.29) $ (1.14)
Weighted average number of common shares outstanding, basic and diluted 36,061,811 26,949,374