CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 558	$ 650
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	75,000	75,000
Common stock, shares issued	39,667	39,619
Common stock, shares outstanding	39,667	39,619
Preferred stock, shares authorized	500	500
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0