Income taxes - Components of tax (benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022
Current tax
Federal	$ 0	$ 0	$ 0
State	76	49	39
Foreign	1,239	0	0
Deferred tax
Federal	38	109	0
State	0	0	0
Foreign	190	325	143
Total provision for income taxes	$ 1,543	$ 483	$ 182