Revenue and contract costs - Schedule of deferred contract acquisition costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022
Capitalized Contract Cost [Roll Forward]
Capitalized contract costs at beginning of period	$ 2,810	$ 4,079
Additions to deferred contract acquisition costs	0	427
Amortization of deferred contract acquisition costs	(1,056)	(1,696)	$ (2,211)
Capitalized contract costs at end of period	1,754	2,810	4,079
Deferred contract acquisition costs, current (to be amortized in next 12 months)	768	1,056
Deferred contract acquisition costs, non-current	986	1,754
Total deferred contract acquisition costs	$ 1,754	$ 2,810	$ 4,079