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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Revenue:        
Total revenue $ 190 $ 0 $ 190 $ 0
Cost of revenue:        
Total cost of revenue 15 0 15 0
Operating expenses:        
Research and development 9,613 10,394 19,320 21,930
Selling, general and administrative 6,325 6,703 12,742 14,011
Total operating expenses 15,938 17,097 32,062 35,941
Other income (expense):        
Interest income 1,307 2,080 2,749 4,311
Other expense (13) (16) (28) (16)
Total other income 1,294 2,064 2,721 4,295
Net loss $ (14,469) $ (15,033) $ (29,166) $ (31,646)
Net loss per share attributable to common stockholders, basic (in dollars per share) $ (0.11) $ (0.12) $ (0.23) $ (0.25)
Net loss per share attributable to common stockholders, diluted (in dollars per share) $ (0.11) $ (0.12) $ (0.23) $ (0.25)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares) 127,135,738 126,204,632 126,886,646 126,174,603
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares) 127,135,738 126,204,632 126,886,646 126,174,603
Grant revenue        
Revenue:        
Total revenue $ 180 $ 0 $ 180 $ 0
Service revenue        
Revenue:        
Total revenue 10 0 10 0
Cost of revenue:        
Total cost of revenue $ 15 $ 0 $ 15 $ 0