Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017	Jun. 25, 2015
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of amortization expense	$ 10,936,000	$ 14,417,000
Accumulated amortization of intangible asset	7,612,000	3,087,000
Liabilities associated with noncancelable internal-use software license at net present value, current	4,879,000	4,346,000
Liabilities associated with noncancelable internal-use software license at net present value, non-current	310,000	4,484,000
Amortization expense	4,650,000	2,981,000	$ 50,000
Impairment of intangible assets	0	0	$ 0
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
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
Noncancelable software licenses [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of amortization expense		6,800,000
Internal-use software licenses [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of amortization expense	6,836,000	10,317,000
Accumulated amortization of intangible asset	7,612,000	3,087,000
Amortization expense	$ 4,700,000	$ 3,000,000