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Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Income Statement [Abstract]        
Revenue $ 152 $ 246 $ 396 $ 246
Operating expenses:        
Research and development 12,057 10,719 23,795 21,899
General and administrative 4,112 4,061 8,383 7,912
Total operating expenses 16,169 14,780 32,178 29,811
Loss from operations (16,017) (14,534) (31,782) (29,565)
Other income (expense):        
Interest and investment income 169 50 236 110
Interest expense (1) (1) (2) (1)
Other income 7   9  
Other income (expense), net 175 49 243 109
Net loss $ (15,842) $ (14,485) $ (31,539) $ (29,456)
Net loss per share - basic $ (0.22) $ (0.28) $ (0.44) $ (0.63)
Net loss per share - diluted $ (0.22) $ (0.28) $ (0.44) $ (0.63)
Weighted-average common stock outstanding - basic 72,106,224 52,049,424 72,038,460 46,876,216
Weighted-average common stock outstanding - diluted 72,106,224 52,049,424 72,038,460 46,876,216
Comprehensive loss:        
Net loss $ (15,842) $ (14,485) $ (31,539) $ (29,456)
Net unrealized (loss) gain on marketable securities (88) 6 (388) (3)
Comprehensive loss $ (15,930) $ (14,479) $ (31,927) $ (29,459)