Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Receivables, allowance for doubtful accounts	$ 22	$ 21
Property and equipment, accumulated depreciation and amortization	$ 4,855	$ 4,678
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	29,750,000	29,750,000
Common stock, shares issued	9,377,797	9,364,804
Common stock, shares outstanding	9,377,797	9,364,804
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	250,000	250,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0