Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Jan. 31, 2019	Jun. 25, 2015
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of amortization expense	$ 10,134,000		$ 10,936,000
Accumulated amortization of intangible asset	8,921,000		7,612,000
Liabilities associated with noncancelable internal-use software license at net present value, current	4,220,000		4,879,000
Liabilities associated with noncancelable internal-use software license at net present value, non-current	479,000		310,000
Impairment of intangible assets	0	$ 0
IPR&D [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of amortization expense	4,100,000		4,100,000
Accumulated amortization of intangible asset	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	6,034,000		6,836,000
Accumulated amortization of intangible asset	8,921,000		$ 7,612,000
Amortization expense	$ 1,300,000	$ 1,100,000