Property and Equipment, Net - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Property Plant And Equipment [Abstract]
Depreciation and amortization expense excluding software development costs	$ 772,000	$ 406,000	$ 1,300,000	$ 745,000
Amortization expense related to software development costs	$ 1,600,000	$ 696,000	$ 3,000,000.0	$ 1,400,000