CONDENSED CONSOLDIATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 290	$ 473
Preferred stock, par value
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	7,064,089	6,979,686
Common stock, shares outstanding	7,064,089	6,979,686