Stockholders' equity - RSU (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Stockholders' equity
RSU's Fair value, Beginning balance (in shares)	141,361
RSU's, Number grants (in shares)	120,129	173,395
RSU's, Number Forfeited/Cancelled (in shares)		(7,032)
RSU's, Number Vested and Released (in shares)	(86,404)	(25,002)
RSU's Fair value, Ending balance (in shares)	175,086	141,361
RSU's Fair value, Opening balance (per share)	$ 4.55
RSU's Fair value, grants in period (per share)	4.56	$ 4.45
RSU's Fair value, Forfeited/Cancelled in period (per share)		4.04
RSU's Fair value, vested in period (per share)	4.31	3.99
RSU's Fair value, Ending balance (per share)	$ 4.68	$ 4.55
Outstanding, Aggregate Fair Value, beginning balance	$ 523
Outstanding, Aggregate Fair Value, Vested and released	284	$ 100
Outstanding, Aggregate Fair Value, ending balance	$ 355	$ 523
RSU's Vested and Deferred Release, Beginning balance (in shares)	5,469
RSUs, Vested and Deferred Release (in shares)	7,554	5,469
RSU's Vested and Deferred Release, Ending balance (in shares)	13,023	5,469
RSU's Vested Fair value, Opening balance (per share)	$ 4.02
RSUs, Vested and Deferred Release (per share)	4.44	$ 4.02
RSU's Vested Fair value, Ending balance (per share)	$ 4.26	$ 4.02
Intrinsic value, opening balance	$ 20
Intrinsic value, ending balance	$ 26	$ 20