Severance and Restructuring Costs - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Restructuring Cost and Reserve [Line Items]
Severance and restructuring costs	$ 75	$ 53	$ 646	$ 1,082
Employee-Related Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	100		200
Severance and restructuring costs	$ 100		$ 400