Income Taxes - Schedule of Reconciliation of The Federal Statutory Income Tax Rate And The Provision For Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Income Tax Disclosure [Abstract]
Tax benefit at federal statutory rate	$ (8,867)	$ (30,017)	$ (27,975)
State taxes, net of federal benefit	6,798	(3,122)	(2,672)
Foreign rate difference	1,676	(305)	1,798
Nondeductible expenses	675	2,313	535
Research and development credit	(6,487)	(6,670)	(5,536)
Stock-based compensation	4,942	6,325	(6,541)
Change in reserve for unrecognized tax benefits	6,487	6,670	5,507
Change in valuation allowance, including the effect of tax rate change	2,301	26,462	35,061
Effect of tax rate change on deferred tax assets	(6,524)		1,028
Other	206	(246)	193
Provision for income taxes	$ 1,207	$ 1,410	$ 1,398	[1]

[1] As reported and disclosed under ASC Topic 840