Balance Sheet Components - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Depreciation and amortization for property and equipment	$ 1.0	$ 0.6	$ 1.8	$ 1.2
Amortization expense for capitalized internal-use software	0.8	0.6	1.5	1.2
Capitalized internal-use software costs	$ 1.7	$ 0.8	$ 2.7	$ 1.5