Condensed Consolidated Statements of Changes in Stockholders' Deficit - USD ($) $ in Thousands		Total	Cumulative effect upon adoption of new accounting standard	Total deficit attributable to Class A and Class B common stockholders	Total deficit attributable to Class A and Class B common stockholders Cumulative effect upon adoption of new accounting standard	Common Stock	Additional Paid-In Capital	Additional Paid-In Capital Cumulative effect upon adoption of new accounting standard	Accumulated Other Comprehensive Loss	Accumulated Deficit	Accumulated Deficit Cumulative effect upon adoption of new accounting standard	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2020						168,002,726
Beginning balance at Dec. 31, 2020		$ 141,019	$ (121,491)	$ 78,824	$ (121,491)	$ 17	$ 3,182,753	$ (126,799)	$ (9)	$ (3,103,937)	$ 5,308	$ 62,195
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted stock awards (in shares)						1,951,664
ESPP purchase (in shares)						977,508
ESPP purchase		4,726		4,726			4,726
Exercise of stock options (in shares)						2,470,262
Exercise of stock options		60,942		60,942			60,942
Stock-based compensation expense		34,295		34,295			34,295
Change in effective portion of interest rate swap agreement		3,268										3,268
Distributions and payments to noncontrolling interests		(4,745)										(4,745)
Foreign currency translation adjustment		(224)		(115)					(115)			(109)
Net loss	[1]	(88,176)		(78,752)						(78,752)		(9,424)
Ending balance (in shares) at Jun. 30, 2021						173,402,160
Ending balance at Jun. 30, 2021		29,614		(21,571)		$ 17	3,155,917		(124)	(3,177,381)		51,185
Beginning balance (in shares) at Mar. 31, 2021						172,099,453
Beginning balance at Mar. 31, 2021		64,046		6,060		$ 17	3,129,687		(126)	(3,123,518)		57,986
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted stock awards (in shares)						811,162
Exercise of stock options (in shares)						491,545
Exercise of stock options		7,715		7,715			7,715
Stock-based compensation expense		18,515		18,515			18,515
Change in effective portion of interest rate swap agreement		(1,385)										(1,385)
Distributions and payments to noncontrolling interests		(882)										(882)
Foreign currency translation adjustment		4		2					2			2
Net loss	[2]	(58,399)		(53,863)						(53,863)		(4,536)
Ending balance (in shares) at Jun. 30, 2021						173,402,160
Ending balance at Jun. 30, 2021		29,614		(21,571)		$ 17	3,155,917		(124)	(3,177,381)		51,185
Beginning balance (in shares) at Dec. 31, 2021						176,460,407
Beginning balance at Dec. 31, 2021		(1,827)		(44,326)		$ 18	3,219,081		(350)	(3,263,075)		42,499
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted stock awards (in shares)						1,789,639
ESPP purchase (in shares)						420,689
ESPP purchase		5,981		5,981			5,981
Exercise of stock options (in shares)						243,062
Exercise of stock options		1,317		1,317			1,317
Stock-based compensation expense		58,382		58,382			58,382
Distributions and payments to noncontrolling interests		(4,415)		(500)			(500)					(3,915)
Foreign currency translation adjustment		(747)		(650)					(650)			(97)
Net loss	[3]	(203,612)		(197,159)						(197,159)		(6,453)
Ending balance (in shares) at Jun. 30, 2022						178,913,797
Ending balance at Jun. 30, 2022		(144,921)		(176,955)		$ 18	3,284,261		(1,000)	(3,460,234)		32,034
Beginning balance (in shares) at Mar. 31, 2022						177,995,695
Beginning balance at Mar. 31, 2022		(54,756)		(90,791)		$ 18	3,251,128		(503)	(3,341,434)		36,035
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted stock awards (in shares)						824,702
Exercise of stock options (in shares)						93,400
Exercise of stock options		337		337			337
Stock-based compensation expense		32,796		32,796			32,796
Distributions and payments to noncontrolling interests		(1,539)										(1,539)
Foreign currency translation adjustment		(594)		(497)					(497)			(97)
Net loss	[4]	(121,165)		(118,800)						(118,800)		(2,365)
Ending balance (in shares) at Jun. 30, 2022						178,913,797
Ending balance at Jun. 30, 2022		$ (144,921)		$ (176,955)		$ 18	$ 3,284,261		$ (1,000)	$ (3,460,234)		$ 32,034

[1] Excludes $26 attributable to redeemable noncontrolling interest.

[2] Excludes $22 attributable to redeemable noncontrolling interest.

[3] Excludes $300 attributable to redeemable noncontrolling interest.

[4] There is no net loss attributable to redeemable noncontrolling interest.