Balance Sheet Parenthetical (USD $) In Thousands, except Per Share data	Jun. 30, 2011	Dec. 31, 2010
Allowance for doubtful accounts	$ 236	$ 261
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	63,630,683	62,630,683
Common stock, shares outstanding	58,940,020	59,999,832
Treasury stock, at cost	3,690,663	2,630,851