Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Allowances for doubtful accounts	$ 139	$ 134
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	33,581,408	32,278,330
Common stock, shares outstanding	28,598,664	27,295,586
Treasury Stock, shares	4,982,744	4,982,744