Discontinued Operations - Summary of Loss from Discontinued Operations in Condensed Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021
Discontinued Operations And Disposal Groups [Abstract]
Revenues	$ 996	$ 2,109
Cost of revenues	967	1,894
Gross income	29	215
Operating expenses	532	1,034
Operating loss from discontinued operations	(503)	(819)
Other expense, net	(27)	(70)
Net loss from discontinued operations	$ (530)	$ (889)