Net Loss Per Common Share - Calculation of Net Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator: Loss:
Loss from continuing operations	$ 423	$ (7,389)	$ (307)	$ (81)	$ (5,947)	$ (581)	$ 381	$ 1,348	$ (7,354)	$ (4,799)	$ (1,744)
Loss from discontinued operations, net of income taxes									(42)	(28)	(67)
Net loss									$ (7,396)	$ (4,827)	$ (1,811)
Denominator: Basic Weighted Average Common Shares Outstanding (in shares)									6,372	6,279	6,199
Basic net loss per common share
Income (loss) from continuing operations (in dollars per share)	$ 0.07	$ (1.15)	$ (0.05)	$ (0.01)	$ (0.94)	$ (0.09)	$ 0.06	$ 0.22	$ (1.15)	$ (0.76)	$ (0.28)
Loss from discontinued operations
Operating loss, net of taxes (in dollars per share)									(0.01)	(0.01)	(0.01)
Discontinued operations (in dollars per share)	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	(0.01)	(0.01)	(0.01)
Net income (loss) (in dollars per share)	0.07	(1.15)	(0.05)	(0.01)	(0.94)	(0.09)	0.06	0.22	$ (1.16)	$ (0.77)	$ (0.29)
Weighted Average Common Shares Outstanding:
Denominator: Basic Weighted Average Common Shares Outstanding (in shares)									6,372	6,279	6,199
Incremental shares from assumed exercise of options, SOSARS and Restricted Stock Units (in shares)									0	0	0
Denominator: Diluted Weighted Average Common Shares Outstanding: (in shares)									6,372	6,279	6,199
Diluted net loss per common share
Income (loss) from continuing operations (in dollars per share)	0.07	(1.15)	(0.05)	(0.01)	(0.94)	(0.09)	0.06	0.21	$ (1.15)	$ (0.76)	$ (0.28)
Operating loss, net of taxes (in dollars per share)									(0.01)	(0.01)	(0.01)
Discontinued operations, net of taxes (in dollars per share)	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	(0.01)	(0.01)	(0.01)
Diluted net income (loss) per common share (in dollars per share)	$ 0.07	$ (1.15)	$ (0.05)	$ (0.01)	$ (0.94)	$ (0.09)	$ 0.06	$ 0.21	$ (1.16)	$ (0.77)	$ (0.29)