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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating expenses:    
Research and development $ 5,880 $ 4,706
General and administrative 2,815 2,746
Total operating expenses 8,695 7,452
Loss from operations (8,695) (7,452)
Other expense, net:    
Interest expense (271) (273)
Interest income 26 220
Other expense, net (51) (332)
Total other expense, net (296) (385)
Net loss (8,991) (7,837)
Other comprehensive income, net:    
Unrealized (loss) gain on available-for-sale securities, net (3) 138
Foreign currency translation gain 45 315
Total other comprehensive income, net 42 453
Comprehensive loss $ (8,949) $ (7,384)
Net loss per share, basic and diluted $ (0.33) $ (0.45)
Weighted-average common shares outstanding, basic and diluted 27,325,372 17,562,551