Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Allowance for accounts receivable	$ 156	$ 197
Stockholders' equity:
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	16,656,731	16,576,701
Common stock, shares outstanding	16,448,752	16,381,316
Treasury stock, at cost	207,979	195,385