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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Operating expenses:        
Research and development $ 5,985 $ 3,893 $ 11,865 $ 8,599
General and administrative 2,858 2,717 5,673 5,463
Total operating expenses 8,843 6,610 17,538 14,062
Loss from operations (8,843) (6,610) (17,538) (14,062)
Other (expense) income, net:        
Interest expense (270) (274) (541) (547)
Interest income 13 122 39 342
Other (expense) income, net (58) 301 (109) (31)
Total other (expense) income, net (315) 149 (611) (236)
Net loss (9,158) (6,461) (18,149) (14,298)
Other comprehensive income (loss), net:        
Unrealized (loss) gain on available-for-sale securities, net (5) (69) (8) 69
Foreign currency translation gain (loss) 51 (308) 96 7
Total other comprehensive income (loss), net 46 (377) 88 76
Comprehensive loss $ (9,112) $ (6,838) $ (18,061) $ (14,222)
Net loss per share, basic and diluted $ (0.31) $ (0.37) $ (0.64) $ (0.81)
Weighted-average common shares outstanding, basic and diluted 29,076,562 17,692,731 28,205,805 17,627,641