Income Taxes - Summary of provision for income taxes from continuing operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Current income tax:
Federal	$ 0	$ 0
State	182	293
Foreign	186	41
Total current	368	334
Deferred income tax:
Federal	(3,418)	12,004
State	(584)	1,805
Total deferred	(4,002)	13,809
(Benefit from) provision for income taxes	$ (3,634)	$ 14,143