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Fair value of financial assets and liabilities - Schedule of Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments $ 5,079 $ 18,266
Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 8,350 12,132
Short-term investments 5,079 18,266
Assets 13,429 30,398
Warrant liability 68 186
Liabilities 68 186
Fair Value, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 8,350 12,132
Short-term investments 5,079 18,266
Assets 13,429 30,398
Warrant liability 0 0
Liabilities 0 0
Fair Value, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 0
Short-term investments 0 0
Assets 0 0
Warrant liability 0 0
Liabilities 0 0
Fair Value, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 0
Short-term investments 0 0
Assets 0 0
Warrant liability 68 186
Liabilities $ 68 $ 186