Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Accounts receivable, allowance	$ 484	$ 523
Par value per common share	$ 0.001	$ 0.001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	29,219,316	27,756,227
Common stock, shares outstanding	29,219,316	27,340,062
Treasury stock, shares	0	416,165