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Summary of significant accounting policies - Schedule of Product Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance, beginning of period $ 520 $ 689
Warranty provisions 0 0
Warranty repairs 0 0
Balance, end of period $ 520 $ 689