Summary of Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2019
Computer and networking equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Computer and networking equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Internal-use software
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years