Description of Business and Basis of Presentation - Additional Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Jan. 31, 2020
Credit Concentration Risk | Accounts Receivable
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of major customers			one		one
Concentration risk percentage			10.00%		10.00%
Customer Concentration Risk | Revenue
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of major customers	No	One	No	One
Concentration risk percentage	10.00%	10.00%	10.00%	10.00%
Geographic Concentration Risk | Revenue | United States
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Concentration risk percentage	72.00%	75.00%	72.00%	75.00%
Geographic Concentration Risk | Revenue | Japan
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Concentration risk percentage	14.00%	10.00%	13.00%
Geographic Concentration Risk | Property and Equipment | United States
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Concentration risk percentage			95.00%		94.00%