Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Deferred Tax Assets:
Accruals and reserves	$ 10,355	$ 7,678
State income taxes	931	116
Stock-based compensation	9,861	5,180
Net operating loss carryforward	32,916	2,885
Tax credit carryforward	21,458	15,411
Lease liabilities	13,808
Other	217	435
Gross Deferred Tax Assets	89,546	31,705
Valuation Allowance	(22,694)	(15,385)
Total Deferred Tax Assets	66,852	16,320
Deferred Tax Liabilities:
Property and equipment	(650)	(822)
Intangible assets	(33,518)	(7,159)
Expensed internal-use software	(974)	(608)
Lease right-of-use assets	(12,717)
Deferred costs	(8,922)	(7,888)
Other	(619)	0
Total Deferred Tax Liabilities	(57,400)	(16,477)
Net Deferred Tax Assets (Liabilities)	$ 9,452
Net Deferred Tax Assets (Liabilities)		$ (157)