Loss per share of common stock - Computation of basic and diluted loss per share of common stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Loss per share of common stock
Net loss	$ (5,652)	$ (10,053)	$ (6,714)	$ (3,818)	$ (734)	$ (2,604)	$ (22,419)	$ (7,156)
Weighted average shares of common stock, basic (in shares)	10,214,087			5,075,817			6,922,338	5,064,670
Weighted average shares of common stock, diluted (in shares)	10,214,087			5,075,817			6,922,338	5,064,670
Loss per share of common stock, basic (in dollars per share)	$ (0.55)			$ (0.75)			$ (3.24)	$ (1.41)
Loss per share of common stock, diluted (in dollars per share)	$ (0.55)			$ (0.75)			$ (3.24)	$ (1.41)