CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 35	$ 36
Preferred stock, par value (in dollars per share)	$ 10.00	$ 10.00
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	569	569
Preferred stock, shares outstanding	569	569
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common Stock, Shares, Issued	28,480,148	28,470,148
Common stock, shares outstanding	28,480,148	28,470,148