Earnings Per Share - Summary of Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Net (loss) income from continuing operations attributable to common stockholders	$ (20,063)	$ (6,418)	$ 4,079
Earnings allocated to unvested participating securities	(44)	(27)	(18)
Numerator for net (loss) income from continuing operations per common share - basic and diluted	(20,107)	(6,445)	4,061
Net (loss) income from discontinued operations attributable to common stockholders	(4,641)	(30,481)	5,068
Earnings allocated to unvested participating securities	(22)	(44)	(61)
Numerator for net (loss) income from discontinued operations per common share - basic and diluted	(4,663)	(30,525)	5,007
Numerator for net (loss) income per common share - basic and diluted	$ (24,770)	$ (36,970)	$ 9,068
Denominator:
Weighted average common shares outstanding	222,436,170	231,538,065	239,526,694
Effect of dilutive stock-based compensation plans			29,000
Denominator for diluted (loss) income per common share - weighted average shares	222,436,170	231,538,065	239,555,636
(Loss) income per Common Share - Basic and Diluted:
Continuing operations, net	$ (0.09)	$ (0.03)	$ 0.02
Discontinued operations, net	(0.02)	(0.13)	0.02
Net (loss) income per common share - basic and diluted	$ (0.11)	$ (0.16)	$ 0.04