Summary of Significant Accounting Policies - Equity Method Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Loss from equity method investment	$ (13,106)	$ (1,096)	$ 0
Operating Income (Loss)	$ (658,534)	(548,918)	$ (362,499)
GO-NET
Schedule of Equity Method Investments [Line Items]
Ownership percentage	20.00%
Equity method investment	$ 21,600
Loss from equity method investment	(13,100)	(1,100)
Impairment loss	11,000
Revenue from related party	11,100	$ 11,600
GO-NET | GO-NET
Schedule of Equity Method Investments [Line Items]
Operating Income (Loss)	$ 2,100