Goodwill (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Goodwill [Roll Forward]
Beginning balance		$ 1,410	$ 2,781	$ 1,505	$ 2,781	$ 2,781
Relief due to asset sale			(1,276)		(1,276)	(1,276)
Impairment	$ (95)			(95)	0
Ended balance	1,410	1,410	1,505	1,410	1,505	1,505
Accumulated impairment		1,116	1,021	1,116	1,021	1,021
RAM
Goodwill [Roll Forward]
Beginning balance		1,410	1,505	1,505	1,505	1,505
Relief due to asset sale						0
Impairment		0		(95)
Ended balance	1,410	1,410	1,505	1,410	1,505	1,505
Accumulated impairment		1,116	1,021	1,116	1,021	1,021
B&N
Goodwill [Roll Forward]
Beginning balance		0	1,276	0	1,276	1,276
Relief due to asset sale			(1,276)		(1,276)	(1,276)
Impairment		0		0
Ended balance	$ 0	0	0	0	0	0
Accumulated impairment		$ 0	$ 0	$ 0	$ 0	$ 0