Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Allowances for accounts receivable	$ 268	$ 311
Stockholders' equity (deficit):
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	31,809,000	27,120,000
Common stock, shares outstanding	29,845,000	25,156,000
Treasury stock, shares repurchased	1,964,000	1,964,000