Goodwill and Intangible Assets, net - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Oct. 31, 2020	Jan. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross	$ 59,347	$ 54,802
Accumulated Amortization	(30,394)	(22,154)
Write-offs	0	(119)
Net	28,953	32,529
Capitalized internal-use software costs
Finite-Lived Intangible Assets [Line Items]
Gross	29,435	24,890
Accumulated Amortization	(18,199)	(14,828)
Write-offs	0	(119)
Net	11,236	9,943
Purchased developed technology
Finite-Lived Intangible Assets [Line Items]
Gross	28,800	28,800
Accumulated Amortization	(11,101)	(6,321)
Write-offs	0	0
Net	17,699	22,479
Software licenses
Finite-Lived Intangible Assets [Line Items]
Gross	1,112	1,112
Accumulated Amortization	(1,094)	(1,005)
Write-offs	0	0
Net	$ 18	$ 107