Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018	Jan. 31, 2019	Jun. 25, 2015
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of amortization expense	$ 9,008,000		$ 9,008,000		$ 10,936,000
Accumulated amortization of intangible asset	10,196,000		10,196,000		7,612,000
Liabilities associated with noncancelable internal-use software license at net present value, current	3,317,000		3,317,000		4,879,000
Liabilities associated with noncancelable internal-use software license at net present value, non-current	478,000		478,000		310,000
Impairment of intangible assets	0	$ 0	0	$ 0
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
Internal-use software licenses [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of amortization expense	4,908,000		4,908,000		6,836,000
Accumulated amortization of intangible asset	10,196,000		10,196,000		$ 7,612,000
Amortization expense	$ 1,300,000	$ 1,200,000	$ 2,600,000	$ 2,300,000