Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Allowance on accounts receivable	$ 225	$ 251
Accumulated depreciation	$ 35,431	$ 33,906
Preferred stock, par value	$ 0.00001	$ 0.00001
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.00001	$ 0.00001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	53,604,818	53,000,867
Common stock, shares outstanding	53,604,818	53,000,867
Treasury stock, shares	18,432,158	18,139,958