Intangible Assets - Summary of Carrying Amounts of Intangible Assets (Detail) - USD ($)	Jul. 31, 2019	Jan. 31, 2019
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 19,204,000	$ 18,548,000
Accumulated Amortization	(10,196,000)	(7,612,000)
Net Carrying Amount	9,008,000	10,936,000
In-process research and development [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,100,000	4,100,000
Accumulated Amortization	0	0
Net Carrying Amount	4,100,000	4,100,000
Internal-use software licenses [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	15,104,000	14,448,000
Accumulated Amortization	(10,196,000)	(7,612,000)
Net Carrying Amount	$ 4,908,000	$ 6,836,000