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Balance sheet components - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Prepaid assets:    
Prepaid CRO expenses $ 4,841 $ 1,086
Other prepaid expenses 802 685
Total prepaid expenses 5,643 1,771
Other current assts:    
Cash from warrant exercise held at transfer agent 949 0
Miscellaneous other current assets 70 64
Total other current assets $ 1,019 $ 64