Net Loss per Common Share - Summary of Calculation of Net Loss Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Weighted average shares outstanding - basic and diluted (in shares)	61,128		59,805		60,819	60,403
Income (loss) from continuing operations	$ 161		$ (9,734)		$ (8,748)	$ (20,653)
Loss from continuing operations per common share: basic and diluted (in usd per share)	$ 0		$ (0.16)		$ (0.14)	$ (0.34)
Loss from discontinued operations	$ (55,788)		$ (742)		$ (58,203)	$ (3,919)
Loss from discontinued operations per common share: basic and diluted (in usd per share)	$ (0.91)		$ (0.01)		$ (0.96)	$ (0.07)
Net loss	$ (55,627)	$ (11,324)	$ (10,476)	$ (14,096)	$ (66,951)	$ (24,572)
Net loss per common share: basic and diluted (in usd per share)	$ (0.91)		$ (0.17)		$ (1.10)	$ (0.41)