Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Parenthetical) (Details) - USD ($) $ in Millions	Oct. 31, 2020	Jan. 31, 2020
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Accumulated amortization of capitalized costs	$ 1.1	$ 0.6

Amount of accumulated amortization of capitalized implementation cost from hosting arrangement that is service contract.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 40
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=118198657&loc=SL118198666-228104

Name:	us-gaap_HostingArrangementServiceContractImplementationCostCapitalizedAccumulatedAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant