Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment per unit value, minimum	$ 1,000
Property, plant and equipment, estimated useful life	1 year
Network Assets
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years	4 years
Change in depreciation expense	$ 31,500,000
Change in net income	$ 26,100,000
Change in net income per share (in dollars per share)	$ 0.16