Net Loss Per Share - Computation of Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator (both basic and diluted):
Loss from continuing operations	$ (33,475)	$ (136,429)
Loss from discontinued operations	(3,797)	(8,452)
Net loss available to common stockholders, basic	(37,272)	(144,881)
Net loss available to common stockholders, diluted	$ (37,272)	$ (144,881)
Denominator:
Weighted-average shares used for basic and diluted earnings per share (in shares)	24,900,000	24,914,000
Loss from continuing operations per share, basic and diluted (in dollars per share)	$ (1.35)	$ (5.48)
Loss from discontinued operations per share, basic and diluted (in dollars per share)	(0.15)	(0.34)
Net loss per share, basic and diluted (in dollars per share)	$ (1.50)	$ (5.82)