Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	9,988	9,988
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	60,000	60,000
Common stock, shares issued	32,768	23,888
Common stock, shares outstanding	32,566	23,794
Treasury stock, shares	202	94
Allowances for accounts receivable	$ 1,945	$ 2,380
Series B Junior Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized	400	400
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0