Goodwill and Acquired Intangible Assets, Net - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jul. 31, 2019	Jan. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		$ 50,055	$ 21,055
Accumulated Amortization		(15,276)	(5,161)
Net Book Value	$ 34,779	34,779	15,894
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		34,700	7,400
Accumulated Amortization		(11,495)	(4,358)
Net Book Value		23,205	3,042
Domain name
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		155	155
Accumulated Amortization		(151)	(128)
Net Book Value		4	27
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		15,200	13,500
Accumulated Amortization		(3,630)	(675)
Net Book Value		$ 11,570	$ 12,825