Loss per share of common stock - Computation of basic and diluted loss per share of common stock (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Loss per share of common stock
Net loss	$ (27,592)	$ (12,470)
Weighted average shares of common stock, basic (in shares)	7,757,128	5,071,101
Weighted average shares of common stock, diluted (in shares)	7,757,128	5,071,101
Loss per share of common stock, basic (in dollars per share)	$ (3.56)	$ (2.46)
Loss per share of common stock, diluted (in dollars per share)	$ (3.56)	$ (2.46)