CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10	$ 0.10
Common stock, shares authorized	100,000,000	100,000,000	100,000,000
Common stock, shares issued	13,599,285	13,488,366	13,297,688
Common stock, shares outstanding	13,599,285	13,488,366	13,297,688
Series A
Convertible preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10	$ 0.10
Convertible preferred stock, shares authorized	50,000	50,000	50,000
Convertible preferred stock, shares issued	50,000	50,000	50,000
Convertible preferred stock, shares outstanding	50,000	50,000	50,000
Series A-1
Convertible preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10	$ 0.10
Convertible preferred stock, shares authorized	4,587,964	0	0
Convertible preferred stock, shares issued	4,587,964	0	0
Convertible preferred stock, shares outstanding	4,587,964	0	0