Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details)			3 Months Ended		9 Months Ended
	Oct. 31, 2017 USD ($)	Jan. 31, 2017 USD ($)	Oct. 31, 2017 USD ($)	Oct. 31, 2016 USD ($)	Oct. 31, 2017 USD ($) Contract	Oct. 31, 2016 USD ($)
Accounting Policies [Line Items]
Number of independent contract manufacturer | Contract					1
Income tax effect of currency translation adjustments related to foreign subsidiaries					$ 0
Allowance for doubtful accounts	$ 0	$ 100,000	$ 0		0
Allowance for returns	400,000	300,000
Inventory write-downs			500,000	$ 300,000	$ 1,400,000	$ 900,000
Warranty for hardware components					1 year
Warranty on software products					90 days
Warranty reserve	0		0		$ 0
Capitalized computer software, development costs	$ 0	$ 0	0		0
Advertising costs			300,000	200,000	$ 2,200,000	600,000
Employee is required to provide service period					4 years
Minimum
Accounting Policies [Line Items]
Estimated useful lives					24 months
Support and maintenance contracts, period					1 year
Maximum
Accounting Policies [Line Items]
Estimated useful lives					60 months
Support and maintenance contracts, period					5 years
Maximum | Sales Demonstration Equipment
Accounting Policies [Line Items]
Estimated useful lives					24 months
Maximum | Leasehold Improvements
Accounting Policies [Line Items]
Estimated useful lives					8 years
Cost of Product Revenue
Accounting Policies [Line Items]
Inventory write-downs			100,000	0	$ 300,000	0
Cost of Support and Maintenance Revenue
Accounting Policies [Line Items]
Inventory write-downs			$ 400,000	$ 300,000	$ 1,100,000	$ 900,000