Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Allowances for accounts receivable	$ 242	$ 311
Stockholders' equity (deficit):
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	1,000	1,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	50,000	50,000
Common stock, shares issued	32,264	27,424
Common stock, shares outstanding	30,300	25,460
Treasury stock, shares repurchased	1,964	1,964