Leases - Schedule of Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Oct. 31, 2020	Oct. 31, 2020
Leases [Abstract]
Cash paid for operating leases included in operating cash flows	$ 625	$ 1,656
Supplemental non-cash information related to lease liabilities arising from obtaining right-of-use assets	$ 85	$ 261