Purchased Intangible Assets - Summary of Purchased Intangible Assets (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Jan. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 12,893	$ 12,893
Accumulated Amortization	(7,696)	(7,273)
Net Carrying Amount	5,197	5,620
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,697	7,697
Accumulated Amortization	(5,425)	(5,152)
Net Carrying Amount	2,272	2,545
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,287	4,287
Accumulated Amortization	(1,892)	(1,775)
Net Carrying Amount	2,395	2,512
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	909	909
Accumulated Amortization	(379)	(346)
Net Carrying Amount	$ 530	$ 563