CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Accounts receivable, allowance for doubtful accounts	$ 1,145	$ 1,167
Preferred stock, par value (per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000	10,000
Preferred stock, issued
Preferred stock, outstanding
Common stock, par value (per share)	$ 0.001	$ 0.001
Common stock, shares authorized	100,000	100,000
Common stock, issued	33,321	33,100
Treasury stock, shares	204	79