Condensed Consolidated Statements of Convertible Redeemable Preferred Stock, Redeemable Noncontrolling Interest, Stockholders' Equity (Deficit) and Noncontrolling Interest - USD ($) $ in Thousands	Total	Redeemable Convertible Preferred Stock	Redeemable Noncontrolling   Interest	Total Stockholders' Equity (Deficit)	Total Stockholders' Equity (Deficit) 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		0
Beginning balance at Dec. 31, 2020		$ 0	$ 377
Increase (Decrease) in Temporary Equity [Roll Forward]
Distributions to noncontrolling interests			(17)
Net loss			(4)
Ending balance (in shares) at Mar. 31, 2021		0
Ending balance at Mar. 31, 2021		$ 0	356
Beginning balance (in shares) at Dec. 31, 2020						168,002,726
Beginning balance at Dec. 31, 2020				$ 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)						1,140,502
ESPP purchase (in shares)						977,508
ESPP purchase				4,726			4,726
Exercise of stock options (in shares)						1,978,717
Exercise of stock options				53,227			53,227
Stock-based compensation expense				15,780			15,780
Change in effective portion of interest rate swap agreement	$ (4,653)											4,653
Distributions and payments to noncontrolling interests												(3,863)
Cumulative foreign currency translation adjustment	(228)			(117)					(117)			(111)
Net loss	(29,781)			(24,889)						(24,889)		(4,888)
Ending balance (in shares) at Mar. 31, 2021						172,099,453
Ending balance at Mar. 31, 2021				6,060		$ 17	3,129,687		(126)	(3,123,518)		57,986
Beginning balance (in shares) at Dec. 31, 2021		10,000,000
Beginning balance at Dec. 31, 2021		$ 208,551	300
Ending balance (in shares) at Mar. 31, 2022		10,000,000
Ending balance at Mar. 31, 2022		$ 208,551	0
Beginning balance (in shares) at Dec. 31, 2021						176,460,407
Beginning balance at Dec. 31, 2021				(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)						964,937
ESPP purchase (in shares)						420,689
ESPP purchase				5,981			5,981
Exercise of stock options (in shares)						149,662
Exercise of stock options				980			980
Stock-based compensation expense				25,586			25,586
Change in effective portion of interest rate swap agreement	0
Distributions and payments to noncontrolling interests				(500)			(500)					(2,376)
Cumulative foreign currency translation adjustment	(153)			(153)					(153)
Net loss	$ (82,747)		$ (300)	(78,359)						(78,359)		(4,088)
Ending balance (in shares) at Mar. 31, 2022						177,995,695
Ending balance at Mar. 31, 2022				$ (90,791)		$ 18	$ 3,251,128		$ (503)	$ (3,341,434)		$ 36,035