Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017	Jan. 31, 2018	Jun. 25, 2015
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of amortization expense	$ 12,366,000		$ 12,366,000		$ 14,417,000
Accumulated amortization of intangible asset	5,389,000		5,389,000		3,087,000
Liabilities associated with noncancelable internal-use software license at net present value, current	4,506,000		4,506,000		4,346,000
Liabilities associated with noncancelable internal-use software license at net present value, non-current	2,856,000		2,856,000		4,484,000
Amortization expense			2,302,000	$ 1,147,000
Impairment of intangible assets	0	$ 0	0	0
Accrued and other current liabilities [Member]
Finite Lived Intangible Assets [Line Items]
Liabilities associated with noncancelable internal-use software license at net present value, current	4,500,000		4,500,000
Other long-term liabilities [Member]
Finite Lived Intangible Assets [Line Items]
Liabilities associated with noncancelable internal-use software license at net present value, non-current	2,900,000		2,900,000
Vis Lab SRL [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets acquired						$ 4,100,000
IPR&D [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of amortization expense	4,100,000		4,100,000		4,100,000
Accumulated amortization of intangible asset	0		0		0
IPR&D [Member] | Vis Lab SRL [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets acquired						$ 4,100,000
Noncancelable software licenses [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of amortization expense	8,300,000		8,300,000
Internal-use software licenses [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of amortization expense	8,266,000		8,266,000		10,317,000
Accumulated amortization of intangible asset	5,389,000		5,389,000		$ 3,087,000
Amortization expense	$ 1,200,000	$ 800,000	$ 2,300,000	$ 1,100,000