Restatement of Previously Issued Condensed Consolidated Financial Statements - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Comprehensive loss	$ 48,504	$ 90,419	$ 138,360	$ 201,345
Less: comprehensive loss attributable to noncontrolling interests and redeemable noncontrolling interests	(5,968)	(8,355)	(19,870)	(14,235)
Comprehensive loss attributable to Class A and Class B stockholders	$ 42,536	82,064	$ 118,490	187,110
Restatement Impacts
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Comprehensive loss		5,000		8,800	$ (5,800)	$ 1,800
Less: comprehensive loss attributable to noncontrolling interests and redeemable noncontrolling interests		$ 5,000		$ 8,800