Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Condensed Consolidated Balance Sheets [Abstract]
Allowance for doubtful accounts	$ 150	$ 134
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	32,761,512	32,278,330
Common stock, shares outstanding	27,778,768	27,295,586
Treasury stock, shares	4,982,744	4,982,744