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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Operating expenses:        
Research and development $ 1,242 $ 1,368 $ 4,458 $ 3,882
General and administrative 2,931 4,491 8,558 10,657
Loss from operations (4,173) (5,859) (13,016) (14,539)
Other income/(expense):        
Other income/(loss) (1) (8) (9) (4)
Amortization expense (8) (355) (8) (402)
Unrealized (loss)/gain on securities 39   137  
Interest income 13 22 41 74
Interest expense (55)   (64)  
Total other (expense)/income (12) (341) 97 (332)
Net loss $ (4,185) $ (6,200) $ (12,919) $ (14,871)
Basic net loss per common share $ (0.16) $ (0.24) $ (0.50) $ (0.64)
Diluted net loss per common share $ (0.16) $ (0.24) $ (0.50) $ (0.64)
Weighted-average number of common shares outstanding basic 26,007 25,598 26,004 22,969
Weighted-average number of common shares outstanding diluted 26,007 25,598 26,004 22,969