Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2020	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Gross property and equipment		$ 175,411		$ 168,655
Less accumulated depreciation and amortization		(75,237)		(67,189)
Total property and equipment, net		100,174		101,466
Depreciation and amortization expense		9,900	$ 6,100
Servers—network infrastructure
Property, Plant and Equipment [Line Items]
Gross property and equipment		91,834		84,979
Buildings
Property, Plant and Equipment [Line Items]
Gross property and equipment		0		13,035
Buildings | ASC 842
Property, Plant and Equipment [Line Items]
Change in property and equipment for adoption of new ASU	$ (13,000)
Construction in progress
Property, Plant and Equipment [Line Items]
Gross property and equipment		10,406		8,692
Capitalized internal-use software
Property, Plant and Equipment [Line Items]
Gross property and equipment		36,671		31,171
Office and computer equipment
Property, Plant and Equipment [Line Items]
Gross property and equipment		16,725		13,528
Office furniture
Property, Plant and Equipment [Line Items]
Gross property and equipment		6,485		6,124
Software
Property, Plant and Equipment [Line Items]
Gross property and equipment		1,236		1,025
Depreciation and amortization expense		2,500	$ 1,300
Leasehold improvements
Property, Plant and Equipment [Line Items]
Gross property and equipment		11,625		9,870
Leasehold improvements | ASC 842
Property, Plant and Equipment [Line Items]
Change in property and equipment for adoption of new ASU	$ 1,600
Asset retirement obligation
Property, Plant and Equipment [Line Items]
Gross property and equipment		$ 429		$ 231