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Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Income Statement [Abstract]    
Revenue $ 244  
Operating expenses:    
Research and development 11,738 $ 11,180
General and administrative 4,271 3,851
Total operating expenses 16,009 15,031
Loss from operations (15,765) (15,031)
Other income (expense):    
Interest and investment income 67 60
Interest expense (1)  
Other income 2  
Other income (expense), net 68 60
Net loss $ (15,697) $ (14,971)
Net loss per share - basic and diluted $ (0.22) $ (0.36)
Weighted-average common stock outstanding - basic and diluted 71,969,007 41,545,050
Comprehensive loss:    
Net loss $ (15,697) $ (14,971)
Net unrealized (loss) gain on marketable securities (300) (9)
Comprehensive loss $ (15,997) $ (14,980)