Common Stock and Stockholders' Equity - Summary of Stock Option Activity (Parenthetical) (Details) - 2006 Stock Plan and 2016 Plan - shares	Jul. 31, 2020	Jan. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options outstanding number	3,241,620	4,233,435
Market and Service Based Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options outstanding number	878,869

Number of options outstanding, including both vested and non-vested options.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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