Intangible Assets - Summary of Carrying Amounts of Intangible Assets (Detail) - USD ($)	Jan. 31, 2020	Jan. 31, 2019
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 31,303,000	$ 18,548,000
Accumulated Amortization	(13,477,000)	(7,612,000)
Net Carrying Amount	17,826,000	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 license [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	27,203,000	14,448,000
Accumulated Amortization	(13,477,000)	(7,612,000)
Net Carrying Amount	$ 13,726,000	$ 6,836,000