Net Loss Per Share - Computation of Basic and Diluted Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Numerator (both basic and diluted):
Loss from continuing operations	$ (32,522)	$ (24,778)	$ (19,315)	$ (14,786)	$ (41,742)	$ (20,354)	$ (30,990)	$ (23,650)	$ (91,401)	$ (116,736)
Loss from discontinued operations	$ (55,245)	$ (14,100)	$ (8,462)	$ (12,690)	$ (4,935)	$ (6,981)	$ (9,064)	$ (6,881)	(90,497)	(27,861)
Net loss available to common stockholders, basic									(181,898)	(144,597)
Net loss available to common stockholders, diluted									$ (181,898)	$ (144,597)
Denominator:
Denominator for basic and diluted earnings per share (in shares)									26,141,414	26,467,417
Net loss from continuing operations per share, basic and diluted (in dollars per share)	$ (1.30)	$ (0.97)	$ (0.71)	$ (0.55)	$ (1.57)	$ (0.77)	$ (1.18)	$ (0.89)	$ (3.50)	$ (4.41)
Net loss from discontinued operations per share, basic and diluted (in dollars per share)	$ (2.22)	$ (0.55)	$ (0.31)	$ (0.47)	$ (0.19)	$ (0.26)	$ (0.34)	$ (0.26)	(3.46)	(1.05)
Net loss per share of common stock, basic and diluted (in dollars per share)									$ (6.96)	$ (5.46)