Net Income (Loss) Per Common Share - Computation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator
Income (loss) from continuing operations	$ (31,483)	$ (30,503)	$ (32,319)	$ (50,815)
Noncontrolling interests’ share in (earnings) loss from continuing operations	47	71	156	228
Net income (loss) attributable to common stockholders before discontinued operations	(31,436)	(30,432)	(32,163)	(50,587)
Income (loss) from discontinued operations	0	(236)	0	500
Net income (loss) attributable to common shares	$ (31,436)	$ (30,668)	$ (32,163)	$ (50,087)
Denominator
Weighted average shares outstanding – basic (in shares)	405,787	411,065	412,077	406,823
Weighted average shares outstanding – diluted (in shares)	405,787	411,065	412,077	406,823
Net income (loss) per share attributable to common stockholders
Continuing operations, basic (in dollars per share)	$ (0.08)	$ (0.07)	$ (0.08)	$ (0.12)
Continuing operations, diluted (in dollars per share)	(0.08)	(0.07)	(0.08)	(0.12)
Discontinued operations, basic (in dollars per share)	0	0	0	0
Discontinued operations, diluted (in dollars per share)	$ 0	$ 0	$ 0	$ 0