Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	5,000,000	5,000,000
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	32,048,000	30,632,000
Common stock, shares outstanding	28,866,000	27,497,000
Treasury stock, shares	3,182,000	3,135,000
Series A Preferred Stock
Preferred stock, shares issued	127,000	127,000
Preferred stock, shares outstanding	127,000	127,000
Series B Preferred Stock
Preferred stock, shares issued	555,000	555,000
Preferred stock, shares outstanding	555,000	555,000